Top Banner
Public Works Authority Drainage Affairs Qatar Sewerage and Drainage Design Manual Volume 8 Developers Guide December 2006 Drainage Affairs POBox 23337 Doha, Qatar I
60
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Page 1: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

Public Works AuthorityDrainage Affairs

Qatar Sewerage and Drainage DesignManual

Volume 8Developers Guide

December 2006

Drainage AffairsPOBox 23337Doha, Qatar

I •

Page 2: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

APPENDIX SI ­

APPENDIX SII -

State of Qatar Public Works AuthorityDrainage Affairs

TABLE OF CONTENTS

1 Introduction 3

1.1 House Connection 3

2 Procedure for Building Permit Application 5

3 Foul Sewerage Design Criteria 8

3.1 General 8

3.1.1 Domestic Flows 8

3.2 Sewerage System Design 8

3.2.1 Minimum Pipe Sizes and Gradients 9

3.3 Manholes and Inspection Chambers 9

3.4 Pipework 10

3.4.1 Materials 10

3.4.2 Construction 11

3.5 Building Drainage 11

3.5.1 Construction 11

3.6 Septic Tanks, Holding Tanks and Soakaways 12

3.6.1 Ground Conditions 12

3.6.2 Design Issues 13

3.6.3 Siting of Septic Tanks and Soakaways 13

3.6.4 Design and Construction 13

3.6.5 Warning Notice 14

3.6.6 Sewage Holding Tanks 15

3.7 Pumping Stations and Rising Mains 16

3.7.1 Rising Mains 16

3.7.2 Pumping Stations 16

4 Storm Drainage 19

4.1 Introduction 19

4.2 Managed Drainage Systems 20

ADVICE NOTE NO 1 - SOAKAWAYS AND STORM STORAGE TANKS FOR SINGLE RESIDENTIAL

DEVELOPMENT 24

ADVICE NOTE NO 2-- DRAINAGE FOR TOWER BLOCKS AND RESIDENTIAL DEVELOPMENTS 29

ADVICE NOTE NO 3- APPLICATION OF THE DRAINAGE IMPACT ASSESSMENT PROCESS TOZONAL AND DISTRICT DEVELOPMENT PROJECTS 33

INFORMATION REQUIRED FOR PROJECT PROFILE 37

INFORMATION REQUIRED FOR DRAINAGE IMPACT ASSESSMENT STUDYREPORT 39

Volume 8 Developer's Guide December 2006 Page 1of 47

Page 3: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

APPENDICESAppendix 1 - Building Permit Application

Appendix 2 - Design Unit Flows

Appendix 3 - Standard Drawings

Volume 8 Developer's Guide December 2006 Page 2of4?

Page 4: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

1 Introduction

The PWA is responsible for all public foul sewerage, surface water and ground waterdrainage systems in the State of Qatar.

All applications for sewerage and drainage for servicing new developments are subject toapproval by the Drainage Affairs as part of the BUilding Permit approval procedure beforesuch facilities can be built.

This Developer's Guide is for small developments up to 350 persons, where the peak flowdoes not exceed 51/s. Larger developments should be designed in accordance with therequirements of Drainage Affairs' Vol 2- Foul Sewerage design manual.

1.1 House ConnectionA house connection is defined as the connection from a development (comprising domestic,commercial, industrial, institutional premises, etc) to transfer foul flows to the publicsewerage system.

For every house connection, a terminal manhole (Manhole Number 1 - MH1), inaccordance with the Standard Drawings, should be provided and should be positioned asshown on 3.3.

The terminal manhole should normally have maximum depth 1.2m. The depth of firstInspection Chamber should be 0.45m.

All house connections should comply with the following general principles:

• They should be designed and constructed to enable foul flows to pass to the publicsewer without flooding or surcharge

• They should be of 150mm minimum internal diameter

• They should laid at minimum gradients 1:60

• They should be constructed to watertight standards in accordance with the standarddrawings and specifications

• The last Inspection Chamber is know as MH1 (terminal manhole) shall be locatedwithin the property boundary but is PWA property.

The private sewerage system shall be designed and constructed as a separate system,capable of accepting foul flows only. Illegal connections allowing the entry of storm waterrunoff shall not be made to the foul sewerage system.

House connection to existing pipelines should be made preferably to the nearest manholewhenever possible, or failing that to a V-junction previously incorporated into the pipelineduring its construction, to facilitate future connections. V-branches and saddles are not to beadded to existing pipelines to avoid the permanent damage resulting from suchmodifications to the public sewer.

Y branches will only be approved by DA if manholes are impractical due to accessrestrictions

Volume 8 Developer's Guide December 2006 Page 3 of 47

Page 5: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Sewer must be surrounded with a Grade OPC 20 Concrete in case of :

• The pipe under the Foot path and the depth less than 0.9m

• The pipe under the Carriageway and the depth less than 1.2m

Volume 8 Developer's Guide December 2006 Page 4of 47

Page 6: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

2 Procedure for Building Permit Application

The basic procedure for application and approval of drainage facilities for developments isas follows;

• Open a building permit file at the Planning Affairs

• Produce Outline Design

• Obtain utility approvals

• Obtain DC1 approval

• Obtain DC 2 approval

• Collect building permit

The information that Drainage Affairs require to enable them to approve the development iscontained in Appendix 1.

Drainage Affairs requirement vary according to the nature of the property. A list ofproperties and the associated requirements is provided overleaf. The list is a guide and isnot limiting.

The provision of septic tanks or holding tanks will only be necessary where there is noexisting sewerage system to connect to. Further information on the choice between septictank and holding tank is provided in Section 3.5.

Volume 8 Developer's Guide December 2006 Page 5 of 47

Page 7: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Table 2.1 • Foul Sewerage Requirements

Category Type of Development Septic Holding Sand Petrol Oil/ Chemical Screen SwimmingTank Tank trap Interceptor Grease stabilisation / Pool

trap dilution DischargeControl

Residential Single Unit ./ ./

Multiple Units /Multi ./ ./

Storey

Commercial Office (small/large) small./ large./

Shops (small/large) small./ large./

Restaurants / Food small./ large./ ./

Outlet

Poultry shop ./

Shopping Mall ./ ./ ./

Hotels ./ ./ ./

Sports Clubs ./ ./ ./

Industrial Garages ./ ./ ./

Car Washing ./ ./

Volume 8 Developer's Guide December 2006 Page 6of 47

Page 8: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Category Type of Development Septic Holding Sand Petrol Oill Chemical Screen SwimmingTank Tank trap Interceptor Grease stabilisation I Pool

trap dilution DischargeControl

Petrol Station v' v'

Abattoir v' v'

Farm Livestock v' v'

Public Service Mosque v'

Hospital/Clinic v' v' v'

Laboratory v' v'

School v' v'

School with laboratory v' v' v'

University / College v' v' v'

Offices v'

Volume 8Developer's Guide December 2006 Page 7of 47

Page 9: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

3 Foul Sewerage Design Criteria

3.1 GeneralSewerage and drainage design shall generally comply with the requirements of EN 752Drain and Sewer Systems outside Buildings. Particular requirements are detailed in thefollowing sections.

3.1.1 Domestic FlowsDomestic flows derive from normal domestic appliances such as sinks, basins, toilets,showers, washing machines, baths, etc. and are dependent on the number of persons in adwelling. In order to determine suitable domestic contributions to the sewerage system, it isnecessary to make certain assumptions. For example, each property has to be assumed tohouse acertain number of persons, and this will vary from one type of property to another.For design purposes 270 litres per person per day should be used.

Peak flows from domestic properties are calculated on a Design Unit (DU) For ease of useatable of populations, design units, peak flows and average flows is provided in Appendix 2.

3.2 Sewerage System DesignThe sewerage system should be designed to facilitate flows within the development bygravity, in a branched arrangement of small sewers from buildings connected to the mainsewer leading to MH1.

Manholes/inspection chambers and sewers should be sited wherever possible a minimum of1.5m from any structural building line

Building over sewers, or directly adjacent to them, causes major problems with access formaintenance and renewal. In extreme cases demolition may be required, and thereforebuilding over sewers should not be carried out.

Foundations and basements of buildings should be designed to ensure that no building loadis transferred to the sewer. The general principles of foul sewer design are:

• Pipe size should not decrease downstream.

• Sewers should be designed to convey peak flows without surcharge.

• Sewers should achieve self-cleansing velocity at least once per day.

• To allow for ventilation of the system, maximum design depth of flow should notexceed 0.75 x pipe diameter.

• Inspection chambers should be provided at each junction, change of diameter,change of direction, change of gradient and at the head of each system.

• Inspection chambers should be provided where the connection from each buildingmeets the main sewerage system of the development

• Spacing between inspection chambers should not exceed 30m.

Volume 8 Developer's Guide December 2006 Page 8 of 47

Tamer Bagoury
Highlight
Page 10: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

• At inspection chambers, all pipes should be laid such that their soffits (tops) are atthe same level.

3.2.1 Minimum Pipe Sizes and GradientsThe minimum size of external sewer from each building is 150mm at a gradient of 1:60.

3.3 Manholes and Inspection ChambersAll manholes and inspection chambers within the development shall have their own uniquereference number. Manholes and chambers shall be numbered in ascending orderupstream from the terminal manhole MH1. Foul manholes shall be prefixed F andstormwater manholes shall be prefixed S.

Manholes and chambers at the head of each system shall include min 75mm or (1/2 x d)piped vents fixed to adjacent walls and exiting at roof level.

5

Buliding line

GATE

Layout plans for both foul and storm water systems shall contain schedules as follows:

MH Ref Cover Invert Depth MHDia Cover TypeLevel Level

All levels and dimensions are to be in metres to Qatar National Height Datum (QNHD).

Volume 8 Developer's Guide December 2006 Page 9of 47

Page 11: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Standard manhole/inspection chamber sizes are.

SCHEDULES OF INSPECTION CHAMBERS

MH. DEPTH COVER.SIZE COMMENTSSIZE (m) (mm) No. of Connections from Buildings(mm)

600X600 < 1.2 600X600 Up to 3 bldg. connections each side

1200X600 < 1.2 1200x600 Up to 7 bldg. connections each side

1220 x675 1220x675

900 DIA > 1.2 600X600 MH 1

The Cover Type for Manholes depend on the Location:

• For foot traffic it should be Light Duty (LD)

• For slow light vehicle traffic it should be Medium Duty (MD)

3.4

3.4.1

Pipework

MaterialsThe preferred material for foul sewers is extra strength vitrified clay pipes and fittings to BSEN 295 or PVC-U to EN1401-1, with flexible joints.

Material

Pipe size mm Min Crushing Strength KNI m2

150 34

200 40

No concrete or asbestos cement pipes shall be used as they will be eaten away by sewergasses.

Pumping mains may be flexibly jointed ductile iron pipes (it is recommended that these arelined internally with fusion bonded epoxy, ceramic epoxy, or polyurethane to resist sewagegases) or HDPE. uPVC should not be used as it is brittle and can fail.

Volume 8 Developer's Guide December 2006 Page 10 of 47

Page 12: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

3.4.2 ConstructionConstruction should be in accordance with the Standard Drawings provided with thisdocument.

3.5 Building DrainageRequirements for building drainage are applicable to domestic buildings or small non­domestic buildings. Systems are generally located within the building and above groundlevel, unless the building has a basement. Complex systems in larger buildings should bedesigned to BS EN 12056.

Building drainage of basement and ground floor shall employ a twin pipe system forseparate discharge of soil and waste flows to foul sewage manholes, as shown below:

Source of Discharge System to which Discharge is to bemade

Toilet, urinals Soil

Bidet Soil

Wash basin, bath, Wasteshower

Kitchen Waste

. .BUilding drainage of first floors and above shall employ asingle pipe system.

Swimming Pools: To prevent flooding of the sewerage system the discharge fromswimming pools shall be limited to a maximum flow rate of 10 lis. Positive means of flowcontrol shall be provided such as a sharp edge orifice plate (50-60mm), a locked flowcontrol valve or a small diameter pipe (e.g 50mm x 3m long or 75mm x 10m long). As theflow control will be dependent upon the particulars of the swimming pool installation thedeveloper shall provide calculations to demonstrate the design of the flow control device.

3.5.1 ConstructionAll sewerage and waste discharge pipes inside the bUilding as far as the manhole should bePVC-U (unplasticised polyvinyl chloride) to BS 4660 and EN1401-1 with push-fit jointsincorporating elastomeric sealing rings to provide flexibility at joints.

Constructing pipelines below building should be avoided where possible. Whereunavoidable the design shall ensure that neither the structural integrity of the pipeline or thebuilding is compromised.

Pipeline trenches should not be excavated lower than the foundations of the building unlessconcrete bedding and surround are used to the lowest level of the building foundation.

Volume 8 Developer's Guide December 2006 Page 11 of 47

Page 13: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs .

3.6 Septic Tanks, Holding Tanks and SoakawaysSeptic tanks and soakaways are used to store and treat foul flows from premises, prior tofuture connection to the main sewerage system. They comprise an underground tank foranaerobic treatment followed by a soakaway tank or pipe system to encourage effluentflows to percolate into the surrounding ground.

Septic tank standard details are shown in Org OG 8 and OG9; soakaways for use with septictanks are shown in Org OG10.

Since septic tanks only provide partial treatment, these tanks are a major source ofgroundwater pollution and therefore should not be constructed where the main seweragesystem is available. For existing developments, house connections from Manhole number 1to the main sewerage system should be made at the earliest opportunity, and usage of theseptic and sewage holding tank stopped.

3.6.1 Ground ConditionsSince the soakaway relies for its operation on outflows infiltrating into the surroundingground, it is vital that the ground conditions allow such infiltration. Ground that is of lowpermeability or with high existing water table will prevent percolation taking place, and theseptic tank system will fail.

Groundwater levels in many parts of this country have risen markedly in recent years, dueto:

• the flat and undulating topography resulting in localised depressions in the underlyingimpermeable layers. Such areas are without efficient drainage routes, and hencesusceptible to rises in groundwater levels during heavy rainfall.

• Urban development has increased flows soaking into the ground, due to septic tanks,water supply leakage and irrigation. The result has been significant rises ingroundwater levels, due to limited permeability of the ground.

• Ground conditions and permeability are highly variable even within very localisedareas;

• Most groundwater levels rise by between 1.0m and 1.5m during a wet period whenmonthly rainfall exceeds 30mm. Level rise reduces to between 0.5m and 0.6mnearer the coast;

Where soakaways do not work Holding Tanks should be provided for a period of 2 days(min) storage.

Any proposed septic tank soakaway system must demonstrate that the surrounding groundhas satisfactory permeability.

Volume 8 Developer's Guide December 2006 Page 12 of 47

Page 14: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

3.6.2 Design IssuesThe following issues require consideration when the use of soakaways is contemplated. Thelist is indicative only and site-specific geotechnical and hydrogeological investigation andinterpretation is always required as the basis for successful design.

For the standard ring-type soakaway chamber some 3m overall depth it is recommendedthat:

• The minimum (wet season) groundwater depth should be more than 3.5 m belowground level;

• In areas where groundwater levels are rising use the groundwater depth should bemore than 4 mbelow ground level as a precautionary measure.

The permeability of the ground has a significant influence on the ability of soakaways tofunction. If the permeability is attributable to sub-vertical jointing which is very variable overshort distances and use of trench type soakaways may overcome this because the chancesof encountering fissured zones is increased. For soakaways a permeability (k) of more than1x 10-5 m/s required

Soakaways can become inefficient due to becoming 'clogged'. This may be due to silting up(which can occur early as the initial 'slug' of water laden with silt generated whengroundwater is disturbed during construction work), and/or 'smearing' when the soakaway isdrilled (i.e. the fissures are blocked off by the crushed drill cuttings). These problems maybe minimised by jetting the system clean prior to its first use.

3.6.3 Siting of Septic Tanks and SoakawaysSeptic tanks should be sited min 7m from any habitable parts of buildings.

The septic tank must be sited in a location where a suction tanker can get to it to empty it.The bottom of the tank should be less than 3m below the level where the vehicle will stand.

Where practical the soakaway should be located at a minimum of 5m from the septic tank orany other structure. The soakaway should not be located within 10m of potable watersupplies in order to avoid possible cross-contamination.

3.6.4 Design and ConstructionSeptic tanks for domestic use should have a capacity below the level of the inlet of at leastC litres where:

C=(225P +2000)

Cis the capacity of the tank (in litres) with a minimum value of 2900 litres.

P is the design population with a minimum value of four.

Volume 8 Developer's Guide December 2006 Page 13 of 47

Page 15: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

ep IC an : Ize an IypePopulation Drainage Affairs Type Capacity (Iitres)

4 A 2,900

10 A 4,500

20 B 6,500

40 C 11,000

80 D 20,000

100 E 24,500

200 F 47,000

300 F 78,500

350 F 80,750

S f T k S' d T

Where septic tanks are required to accept discharges from other than domestic sources,details of actual flows shall be provided.

Septic tanks are to be constructed in accordance with the Standard Details Drg. Nos. DG8or DG9 as appropriate, or approved alternative prefabricated tanks. Tanks shall bewatertight and prevent leakage of their contents and ingress of groundwater. Ventilation is tobe provided with outlets distant from habitation.

The inlet and outlet of the septic tank shall be designed to prevent disturbance to thesurface scum or settled sludge, and shall incorporate at least two chambers orcompartments operating in series. Where the width of the tank does not exceed 1200mmthe inlet should be made via a dip pipe. To minimise turbulence, provision shall be made tolimit the flow rate of the incoming foul water. For incoming pipes up to 150mm diameter, thevelocity shall be limited by laying the last 12m of the incoming pipe at agradient of 1 in 50 orflatter.

The inlet and outlet pipes of the septic tank shall be provided with access for sampling andinspection.

Septic tanks shall be provided with facilities for emptying and cleaning. Access covers shallbe of durable quality having regard to the corrosive nature of the tank contents. All accessshall be lockable or otherwise engineered to prevent unauthorised entry.

3.6.5 Warning NoticeA notice shall be fixed within an adjacent building describing the necessary maintenance.The wording shall be in Arabic and English liThe foul sewage system from this propertydischarges to a septic tank and soakaway. The septic tank requires monthly inspections ofthe outlet chamber or distribution box to observe that the effluent is free flowing and clear.The septic tank requires emptying at least once every 12 months by a licensed contractor.

Volume 8 Developer's Guide December 2006 Page 14 of4?

Page 16: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

The property owner is legally responsible for ensuring that the system does not causepollution, a health hazard or a nuisance."

3.6.6 Sewage Holding TanksWhere soakaways cannot be permitted due to unfavourable ground conditions or thenumber of units delivering to the tank is high, it will be necessary to provide a sewageholding tank.

The site of the sewage holding tank should preferably be on ground sloping away from andsited lower than any existing bUilding in the immediate vicinity.

The tank shall be sited at least 7m from any habitable parts of buildings and preferablydown slope. Sewage holding tanks shall be sited such levels that they can be emptied andcleaned without hazard to the building occupants or the contents being taken through adwelling or place of work. Access to the tank may be through a covered space, which maybe lockable.

Sewage holding tanks should have a minimum capacity for the population range as shownin the Holding Tanks Capacity table.

Thereafter the size should be calculated as follows:

Volume (m3) =Population x Retention x 0.27

Where the calculated volume is less than the minimum shown the minimum capacity is to beprovided.

Holding Tank Capacity

Population. Retention Size(days) (m3)

2- 20 25 18 - 135

21-40 20 135-216

41- 80 15 216 -324

80 -150 12 324 - 486

150- 350 10 486 - 945

Tanks should be designed as water retaining structures, and be constructed in reinforcedconcrete, or alternative watertight material. The design of the tank shall ensurewatertightness and provide protection from external corrosion.

Sewage holding tanks should have no openings except for inlet, outlet and ventilation.Tanks should be provided with access for emptying and cleaning. Access covers shall be ofdurable material, having regard for the corrosive nature of the tank contents. Every accessshould be lockable or otherwise engineered to prevent unauthorised entry.

The developer shall be responsible for making satisfactory arrangements with the DrainageAffairs for emptying. of the sewage holding tank. Details of all maintenance arrangements

Volume 8 Developer's Guide December 2006 Page 15 of 47

Page 17: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

will require to be approved by the Drainage Affairs prior to approval of the building permitapplication.

3.7 Pumping Stations and Rising MainsPumping stations should only be used where it is impossible to gravitate into the PWA mainsewerage system. Bypassing or overflowing from pumping stations is generally notpractical therefore failure of the pumping station may results in discharge of sewage to thesurrounding land or within the property

Responsibility for operation and maintenance of all pumping stations and rising mains willremain with the developer. This Guide provides general information for pumpinginstallations. It is recommended that specialist advice be sought, supported bymanufacturers' recommendations.

3.7.1 Rising MainsThe desirable range of velocity should be 1mls to 2m/s. If small pipes are (.75mm) usedthen the pump should be able to chop up the sewage.

The roughness value used for the design of the rising main should be shown in thecalculations and should be in accordance with "Tables for the Hydraulic Design of Pipes,Sewers and Channels" published by HR Wallingford. The following roughness values (ks)shall generally apply:

Mean Velocity in m/s ks

Up to 1.1m/s O.3mm

Between 1.1 mls and 1.5m/s O.15mm

Over 1.5m/s O.06mm

In the design of pressurised pipelines, thrust blocks are to be provided on flexibly jointedpipelines where any pipe movement would open up the joints in the line and cause waterleakage.

Thrust blocks are also necessary near valves where a flexible joint is located to facilitateremoval of the valve for maintenance purposes.

The size of block is dependent upon the deflection of the flow, the size of the pipe and thehead of water inside the pipe.

3.7.2 Pumping StationsSubmersible Pumping Stations

It is expected that the maximum flows to be pumped will be less than 51/s, for whichsubmersible pumping stations are to be provided. Submersible pumping stations shouldincorporate the following features:

Volume 8Developer's Guide December 2006 Page 16 of 47

Page 18: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

• Minimum of one duty and one standby pump with all pumps being of the same makeand pump model number.

• Pumps and associated equipment suitable for the duty required.

• Non return and gate valve for each pump isolation.

• Operation level controls (either electrode or ultrasonic) as follows:

High level alarm

Pump start

Pump stop

Low level pump protection in addition to the method installed for pumpcontrol.

• Ultrasonic level controls should be configured to hold the last measurement in theevent of a lost echo.

Design Requirements

Detailed design should incorporate the following:

• There should be sufficient space between the pumps to prevent interaction betweenthe pump suctions.

• Pump stools should be securely bolted to the structural concrete of the sump and notthe benching.

• Discharge and non return valves to be in a separate easily accessible chamberadjacent to the pump sump and not located within the pump sump.

• Pump guide rails should rise close to the underside of the sump covers above thepumps.

• The covers should have a clear opening large enough to allow the removal of thepump while on the guide rails.

• Support points for the pump power cables and lifting chain should be provided underthe pump covers, these should be easily accessible from the surface.

Details of the capacity, power consumption and efficiency of the proposed pumps should besubmitted for approval. It would be expected that pumping stations would comply with thepump manufacturer's requirements.

Submersible Pump Requirements

Sewage pumps should have an open type impeller with a minimum passage of 100mmunless chopper pumps are being used. Impellers with smaller passages are likely to sufferfrom frequent blockage due to the nature of sewage debris.

Volume 8 Developer's Guide December 2006 Page 17 of 47

Page 19: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Centrifugal pumps are recommended to have a maximum running speed of 1450 rpm (4pole motor) pumps. Speeds in excess of this we cause excessive wear and prematurefailure.

The maximum allowable starts per hour should be as specified by the pump or motormanufacturer. In the absence of any specified figure a maximum of 15 starts/hour isacceptable.

Structure Requirements

The developer shall supply full details of general arrangement and structural drawings andsupporting calculations for approval.

Package pumping stations contained in GRP or Polyethyelene structures as supplied by thepump manufacturers are acceptable. The structures are to be surrounded by a minimum of150mm of OPC20 concrete.

All other pumping stations shall be constructed of reinforced concrete, designed inaccordance with BS8110 "The Structural Design of Concrete" with specific requirements forwet wells of BS8007 "Design of Concrete Structures for Retaining Aqueous Liquids".Design crack widths shall be in accordance with BS8007 and shall not exceed a maximumdesign surface crack width of 0.20mm from direct tension, flexure and temperature effects.

Ventilation and Odour Control

Small pumping stations generally do not require odour control. However, where odourcontrol is required passive activated carbon unit should be sufficient.

Electrical Requirements

All electrical equipment, cabling and installations shall meet the requirements of theKAHRAMAA.

Control equipment shall be housed in dust and damp-proof, compartmentalised cubicles,complying with the relevant British Standards. Adequate anti-condensation heaters are to beprovided in all compartments. All outdoor equipment shall be waterproof. All control panelsshall be provided with a 13-amp single-phase power outlet and a25-volt outlet for a portableinspection lamp.

Emergency stop, lock-off buttons shall be provided adjacent to all plant installations. Unlessspecifically designed for submersible operation, all electrical plant shall be located abovemaximum water level.

Site Requirements

Pumping stations will generally be located with the development site. Consideration shouldbe given to the need for light vehicle access for maintenance purposes.

Volume 8Developer's Guide December 2006 Page 18 of 47

Page 20: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

4 Storm Drainage

4.1 IntroductionThe purpose of this guide is to advise developers of the Public Works Authority (PWA)requirements for the provision of surface water and ground water management withindevelopment sites.

The existing surface water and groundwater systems in Qatar are of limited extent. Primarilythese systems manage surface water runoff and control groundwater levels for thehighways. Urbanisation of the catchments increases the amount of potential runoff fromdevelopment sites which would cause overload of these systems. This guide has thereforebeen developed to guide and assist developers in designing a managed drainage systemthat does not adversely affect the existing drainage network but will provide protection fromflooding for the development.

This guide sets out the criteria that Drainage Affairs (DA) requires developers to follow forthe provision of a Managed Drainage Systems for the disposal of surface water andgroundwater.

Drainage Affairs have developed Advice Notes for four types of development which containinformation on how the Managed Drainage System approach can be achieved.

The types of development specified are as follows:-

single residential development

residential compounds

tower blocks

zonal &regional development

Figure 1 indicates the decision process for the appropriate type of development.

Volume 8 Developer's Guide December 2006 Page 19 of 47

Page 21: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

I Developer's Drainage Requirements I1

I Managed Drainage System II

1 1 ~

ISingle Residential

I IResidential

I r Tower Blocks l I Zonal and Regional IDevelopment Compounds Developments

J. 1 l

I See Advice Note 1 I ISee Advice Note 2 I I See Advice Note 2 I I

See Advice Note 3I

i 1 1 1Definition: Definition: Definition: Appoint Recognised and

Single house on a development plot. A residential compound is a development Tower block is defined as a multistorey Experienced Drainage Consultantconsisting of properties and internal roads residential or commercial development.

1Drainage Philosophy: upto 5 hectares in area.Infiltration/percolation systems Drainage Philosophy: Definition:(soakways, infiltration basin etc) in areas Drainage Philosophy: Storage/Allenuation tank system. Development of residential compoundsof low groundwater table. Infiltration/percolation systems greater than 5 hectares and development

(soakways, infiltration basin etc) and Disposal of Surface Water of single and multiple QAR Zones.Tanks in areas of high groundwater table. storage system (tank sewers, retention Direction connection permitted to

tanks ,etc) in areas of low groundwater Drainage Affairs assets IT available. Drainage Philosophy:Drainage systems to serve roofs and table. Storage tanks in areas of high

Drainage Impact Assessment (DIA)hardstanding areas as necessary. groundwater table. Permitted Discharge: required.

101/s per ha of development.Disposal of Surface Water Disposal of Surface Water

Disposal of Surface WaterNo Direct connection to Drainage Affairs Direction connection permitted to Typical Minimum Storage Requirements SUbject to approved DIA.assets permitted Drainage Affairs assets if available. 390m3/ha

Permitted Discharge:Permitted Discharge: Permitted Discharge: Subject to approved DIA.

Not Applicable 101/s per ha of development.

Typical storage ReqUirements: Typical Minimum Storage RequirementsTypical Storage Requirements

150m3/ha 270m3/haSubject to approved DIA.

1Drainage Affairs Requirements

Submission of Project ProfileSubmission and Approval of DIA

1

IProposal for Soakawayl

I IProposal for Managed

I IProposal for Managed

IProposal for Managed

Stormtank System Stormwater System for Stormwater System for Stormwater System for Zonal andResidential Compound Tower Block Regional Development

Figure 1: DEVELOPERS DRAINAGE REQUIREMENTS

Volume 8Developer's Guide December 2006 Page 20 of 47

Page 22: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

4.2 Managed Drainage SystemsThe Developer should consider a number of basic principles before commencing with a sitelayout plan as follows:-

• Site topography with respect to site levels should be studied in detail. Developmentin the lowest parts ofthe sites should be avoided. The lowest parts of the site can beused to store and collect any stormwater runoff minimizing the construct costs ofpiped networks. Building on the highest part of the site may reduce amount ofprotection from flooding that is required.

• High groundwater tables can cause problems not only during construction butafterwards with damage to underground structures and utilities. Drainage Affairshave information available on the areas in Qatar where high groundwater is aproblem and can provide guidance as to its control. If a site is water logged filling thelow lying areas does not remove the problem, it only hides it from view. A long termsolution is needed which may include ground water control.

• Drainage Affairs require surface water runoff to be managed and controlled for alldevelopments and therefore adequate provision should be made in all developmentsfor the storage/attenuation of stormwater runoff.

• Ground conditions within the site should be understood, whether there is sand, fillmaterial or massive rock will all have an influence on the type of surface waterdrainage systems that may be developed for the site.

• Site grading has a considerable influence on the cost and effectiveness of the sitedrainage and therefore should be considered at a very early stage. A flat or level siteis much more expensive to drain than a site which has some fall across it wherenatural drainage paths can be developed. Development adjacent to the coast shouldbe graded to a minimum of level of 3.5m above Qatar datum. This will allow gravitydrainage systems to be developed and will protect other utilities and buildingfoundations from damage through high groundwater levels.

• The design standards for the drainage system for the development should beestablished at an early stage. The degree of protection from flooding for thedevelopment needs to be established at an early stage to

Drainage Affairs philosophy is to manage to surface water and groundwater systems by theuse of various techniques that are part of the stormwater management philosophy describedunder various names around the world such as SUDS(Sustainable Urban Development(UK)), BMP (Best Management Practice (USA)) and Stormwater Management(Australia).

The techniques that have been identified as appropriate for Qatar are:-

Preventative measures

The first stage of the Managed Approach is to reduce the runoff quantities. This may includereducing the amount of hard surfacing within a development and using soft landscaping

Volume 8 Developer's Guide December 2006 Page 21 of 47

Page 23: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

suitable for a desert climate instead. Construction of individual tanks or soakaways for eachproperty to store or disperse the rainfall.

Pervious surfaces

Surfaces that allow inflow of rainwater into the underlying construction or soil. This is adevelopment of the block paving technique that is currently in extensive use in Qatar todevelop its full potential by the use of geotextile filter membranes.

Filter drains

Linear drains consisting of trenches filled with a permeable material or modular plastic tanksystems, often with a perforated pipe in the base of the trench to assist drainage, to storeand conduct water; they may also permit infiltration.

Swales

Swales consist of wide shallow channels with or without vegetation that conduct and retainwater, and may also permit infiltration. These work well within development sites with alarge proportion of landscaping where the design of the landscaping can easily incorporatethese features.

Emergency Flood Areas (EFA)

The use of Emergency Flood Areas (EFA) is well established in Qatar and is a viable optionfor the management of surface water run off.

Infiltration devices

Sub-surface structures such at modular tanks systems that can promote the infiltration ofsurface water to the ground. There are a number of proprietary systems on the market forthis.

Oversize Pipes and Throttles

This option is appropriate if there is a positive drainage system nearby that can take acontrolled amount of runoff for the site.

All of these techniques are valid solutions to produce a Managed Drainage System,however every development site is different and will have different problems that will requiredifferent solutions.

Volume 8 Developer's Guide December 2006 Page 22 of4?

Page 24: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Stormwater Drainage References

1 Qatar Sewerage and Drainage Design Manual

Volume 3 Surface and Groundwater Drainage2 Qatar Highways Design Manual

3 Soakaways: BRE Digest 151

4. Scope for Control of Urban Runoff: CIRAI Report 124 1992

5 Interim Code of Practice for Sustainable Drainage Systems: National SUDS WorkingGroup(UK) July 2004

6 Stormwater Best Management Practices in an Ultra-Urban SettingUS Department of Transport Federal Highway Administration

7 Statutory Instrument 1999 No. 1783The Environmental Impact Assessment (Land Drainage Improvement Works)Regulations 1999 : DEFRA UK

Volume 8 Developer's Guide December 2006 Page 23 of 47

Page 25: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

ADVICE NOTE NO 1· SOAKAWAYS AND STORM STORAGE TANKS FOR SINGLE RESIDENTIALDEVELOPMENT

1.0 Introduction

Soakaways and storm tanks are simple methods of managing storm water run off in situations where thereis no positive stormwater system available or planned for the future.

The three determining factors for the design of asoakaway drainage system are:-

the size of the area which relates to the volume of water to be drainedthe percolation rate of the soil/sub-soilthe depth to the water table i.e. the upper level of the groundwater that is naturally heldwithin the soil, sub-soil or bedrock. '.

Soakaways should be provided for all roof areas and hard standing areas within the building plot.

2.0 Soakaways or Storm Tanks

The choice of soakaway or storm tank for managing the surface water runoff from a site willdepend upon the depth of the ground water level for the ground surface.

The method of determining whether a soakaway or storm tank is appropriate is indicated 'on thefollowing flow chart.

Volume 8 Developer's Guide December 2006 Page 24 of 47

Page 26: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Residential PropertiesSoakaway I Stormtank

Design Choice

Obtain Information on Ground waterlevels from design query

No

Design the Soakwayin accordance with

the guidelines

Obtain Drainage AffairsApproval

Yes

Design the StormTank in accordancewith the guidelines

Figure 1: Choice of Soakaway or Storm Tank

3.0 Sizing of Facilities

3.1 Size of Soakaway

The following table shows the size of soakaway/tank that needs to be constructed.

Table 1: Depth of soakaway required for the design rainfall for different drainage areasChamber Volume Calculation Chamber Diameter

Roof AreaRainfall

to beDepth for 1in Runoff Volume of 1.2 1.5 1.8 2.1

drained2 year 24 hr Coefficient Storage

Duration

m2 Mm m3 m m m m

100 25 0.9 2.3 1.99 1.27 0.88 0.65

200 25 0.9 4.5 3.98 2.55 1.77 1.30

300 25 0.9 6.8 ><>< 2.65 1.95

400 25 0.9 9.0 ><>< 3.54 2.60

500 25 0.9 11.3 ><>< 4.42 3.25

Volume 8 Developer's Guide December 2006 Page 25 of4?

Page 27: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Note that this is the storage volume required between the dry base or water table level of the soakaway,and the invert (inlet) level of the incoming drainage pipe, and assumes that the chamber is empty.

For example if the drainage area indicates that a 1.5metre diameter chamber with a soakaway depth of2.55 then if the invert level of the incoming pipe is, say, 600mm below ground level, and assuming thebase is above water table level, then the overall depth of the soakaway is...

2.55m + 0.6m =3.15m overall depth.

If there is insufficient depth because of a high water table, the required volume of the soakaway can bemet by increasing the plan size or placing two or more soakaways of this size side by side.

3.2 Size of Storm Tank

The sizing of the stormtankl tank should follow the procedure indicated in Table 2.

Table 2: Depth of Tank required for the design rainfall for different drainage areasTank Volume Calculation Tank Diameter

Rainfall

Area toDepth for

Factor Volumebe

1in 2 Runoffof of 1.2 1.5 1.8 2.1

drainedyear 24 Coefficient

Safety StoragehourDuration

m2 mm m3 m m· m m

100 25 0.9 1.1 2.5 2.19 1.40 0.97 0.71

200 25 0.9 1.1 5.0 4.38 2.80 1.95 1.43

300 25 0.9 1.1 7.4 ><>< 2.92 2.14

400 25 0.9 1.1 9.9 ><>< 3.89 2.86

500 25 0.9 1.1 12.4 ><>< 4.86 3.57

It should be noted that the tank will have to be pumped out after the rainfall has finished, restoring theflood protection of the property.

4.0 Construction details

4.1 Soakaway Construction

Atypical standard detail drawing of a soakaway is included as Figure A1of this advice note.

Volume 8 Developer's Guide December 2006 Page 26 of4?

Page 28: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Ready-made soakaway systems are locally available in pre-cast concrete. These tend to be circularsections that can be stacked to give the required depth and storage volume, and then topped with asuitable cover.

4.2 Tank Construction

Atypical standard detail drawing for astormwater tank is included in Appendix 3.

Pre-cast chamber rings are locally available and can be stacked to give the required depth and storagevolume.

Modular plastic boxes which can be used to provide both storage and soakaway functions are available inthe local market. For further information please contact Drainage Affairs.

5.0 Maintenance of Stormwater Systems

5.1 Soakaways

Soakaways do require some maintenance to keep them operating satisfactorily. Each year after the rainyseason the following maintenance task should be carried out:-

Inspect catchpit and remove any silt in the catchpit.Inspect soakaway and remove any silt in the chamber.

5.2 Tanks

In order to make the tank effective in the control of stormwater runoff, after each rainfall event the tankshould be emptied of water and silt. The water in the tank should be tankered away or it can be used forirrigation of any garden areas. Under no circumstances should the tank be emptied to the foulsewerage system.

Each year after the rainy season the following maintenance tasks should be carried out:­

Inspect silt trap and remove any silt in the trap.Inspect tank and remove any silt in the tank.Inspect and repair any leaks.

6.0 Safety6.1 Excavations

Excavations can be dangerous and the following points should be noted.

all excavations should be fenced off or covered to prevent accidents.deep excavations should have sufficient support provided to prevent collapse of theexcavation or debris falling into the excavation.

Volume 8 Developer's Guide December 2006 Page 27 of 47

Page 29: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

6.1.1 Entry into Confined Spaces

Any tank buried in the ground can be dangerous. Only qualified and experienced operatives who haveand are trained in the use the appropriate safety equipment for entry into confined spaces should beemployed to carry out the cleaning and inspection works.

References

Qatar Sewerage and Drainage Design Manual

Volume 3 Surface and Groundwater Drainage

2 Qatar Highways Design Manual

3 Soakaways: BRE Digest 151

Volume 8 Developer's Guide December 2006 Page 28 of 47

Page 30: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

ADVICE NOTE NO 2 ••

1.0 Introduction

DRAINAGE FOR TOWER BLOCKS AND RESIDENTIAL DEVELOPMENTS

The drainage of tower blocks and small residential compounds requires the designer of the drainagesystem to develop site specific solutions to protect the development from the results of flooding.

The basic requirement is that the development must deal with its runoff within the site and not export theproblem to adjacent developments. Drainage affairs recommend a number of methods that could be usedto manage the drainage system form tower blocks and residential developments. The designer of theproposed system should make himself aware of the concepts of managed drainage systems and choosethe most appropriate system for the site in question.

It is not obligatory, but it may be useful for the developer to produce a project profile for the site drainage.The project profile provides a means to collect all relevant data for the development area which will help toproduce the Managed Drainage System proposal.

2.0 Managed Drainage systems

Drainage Affairs recommend that the designer of drainage system for the development investigates thefollowing measures and systems to manage the surface water run off.

Preventative measures

The first stage of the Managed Approach is to reduce the runoff quantities. This may includereducing the amount of hard surfacing within a development and using soft landscaping suitable fora desert climate instead. The use of individual tanks or soakaways for each property to store ordisperse the surface run off is another method of reduction in surface water run-off.

Pervious surfaces

Pervious surfaces are surfaces that allow inflow of rainwater into the underlying construction or soil.In Qatar extensive use is made of block paving for footpaths and parking area. Instead of beddingthe concrete blocks directly on sand bed if they are laid on a granular sub-base water can stored inthe sub-base and infiltrate into the ground. Typically the sub-base consists of 300m of 25 - 150mmgrades stone overlain with a geotextile. The bedding for the block paving consists of 50 mm of 4­10 mm graded stone.

Filter drains

Linear drains consisting of trenches filled with a permeable material or modular plastic tanksystems, often with a perforated pipe in the base of the trench to assist drainage, to store andconduct water; they may also permit infiltration.

Swales

Volume 8 Developer's Guide December 2006 Page 29 of 47

Page 31: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Swales consist of wide shallow channels with or without vegetation that conduct and retain water,and may also permit infiltration. These work well within development sites with a large proportionof landscaping where the design of the landscaping can easily incorporate these features. Theswales can be used for infiltration and evaporation. Areas of planting which are lower than thesurround areas can be used in asimilar way to aswale.

Emergency Flood Areas (EFA)

The use of Emergency Flood Areas (EFA) is well established in Qatar and is a viable option for themanagement of surface water run off. An area of the development site is designated as an EFAand depending on the site usage and the depth of water to be stored may need to be fenced of toprevent accidents to children and adults.

Infiltration devices

Sub-surface structures such at modular tanks systems that can promote the infiltration of surfacewater to the ground. There are a number of proprietary systems on the market for this. This isgrowth area in the field of managed drainage systems with a number of manufacturers being ableto provide plastic modular systems to build large tanks that can be installed under car parksrecreation areas etc which provide storage, attenuation and infiltration facilities for the surfacewater run-off.

Oversize Pipes and Throttles

This option is appropriate if there is a positive drainage system nearby that can take a controlledamount of runoff for the site. A smaller diameter pipe or orifice plate is used at the outlet to controlthe discharge rate.

3.0 Basic Design Principles

The basic principle of the design of the drainage system for the development is to control runoffwithin the development as follows:

No Drainage Affairs stormwater system available. Drain to on site stormwater storagesystem as indicated on Figure 1of these guidelines.

Existing or proposed Drainage Affairs stormwater system. Connection to the DrainageAffairs system by overland flow, or direct connection via managed drainage system asindicated on Figure1 of these guidelines.

4.0 Project Profile

In order that the designer can assess the requirements it is recommended but not obligatory toproduce a project profile. The project profile should include all relevant information available.Information should be in note form. The checklist below is provided as a guide only, to assist in

Volume 8 Developer's Guide December 2006 Page 30 of 47

Page 32: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

identifying major items which should be included or considered in completing the project profile toassist in the choice of managed drainage system for the site.

1.

2.

3.

AN OUTLINE DESCRIPTION OF THE PROJECT

Provide the following information:

• Project title• Developer• Contact Person (name/telephone)• Nature and description of the project• Location (include plans)• Area of project site and %paved/unpaved• Finished site platform level• Whether planning permission application is required• Recent and dated photographs to show a panoramic view of the site

AN OUTLINE OF THE PLANNING AND IMPLEMENTATION PROGRAMME

a) Explain how the project will be planned and implemented

e.g. authorized person/consultants/contractor.

b) Identify the project timetable for:

• appointing consultants/authorized person• planning/preliminary designs• preparing a Drainage Impact Assessment (DIA)study (if required - see

Advice Note No.3)• finalizing designs• implementation• completion/commencing operation

c) Identify any interactions with other projects which should be considered.

AN OUTLINE OF THE EXISTING DRAINAGE

Volume 8 Developer's Guide December 2006 Page 31 of 47

Page 33: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Provide the following drainage details:

• A 1:20000 scale plan of the catchment in which the project site is located with thedrainage system relevant to the proposed project highlighted.

• A detailed layout plan at 1:5000 scale or larger, of the project site with the siteboundary, existing ground levels, existing drainage and existing land uses allidentified both within and adjacent to the project site.

• A general description of the existing drainage including adequacy of the drainagesystem and flooding history.

4. OTHER INFORMATION

Provide the following information:

• Potential drainage impacts (described in broad terms) arising from the project.• Ageneral description of the proposed drainage impact mitigation measures (if any) to

be provided.• Ageneral description of the proposed drainage system.• Ageneral statement on the flooding situation upon completion of the project.

References

1 Qatar Sewerage and Drainage Design ManualVolume 3 Surface and Groundwater Drainage

2 Qatar Highways Design Manual

3 Soakaways : BRE Digest 151

4. Scope for Control of Urban Runoff: CIRAI Report 124 1992

5 Interim Code of Practice for Sustainable Drainage Systems: National SUDS Working Group(UK)July 2004

6 Stormwater Best Management Practices in an Ultra-Urban SettingUS Department of Transport Federal Highway Administration

7 Statutory Instrument 1999 No. 1783The Environmental Impact Assessment (Land Drainage Improvement Works) Regulations 1999 :DEFRA UK

Volume 8 Developer's Guide December 2006 Page 32 of4?

Page 34: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

ADVICE NOTE NO 3· APPLICATION OF THE DRAINAGE IMPACT ASSESSMENT PROCESS TOZONAL AND DISTRICT DEVELOPMENT PROJECTS

Table 11. INTRODUCTION

1.1 This Advice Note outlines the Drainage Affairs assessment procedures for the drainage impactof zonal and district development projects. It is anticipated that the information contained inthis document will assist in preparing project profiles and in addressing the project's potentialdrainage impacts.

1.2 Many private sector projects have the potential to cause adverse impacts on stormwaterdrainage, groundwater and flooding. These impacts need to be considered at the early stagesof the project planning and designed to minimize drainage and flooding problems and to avoidexpensive remedial measures.

1.3 The Drainage Impact Assessment (DIA) process provides for a systematic approach inaddressing drainage issues associated with any project. The primary objective of the DIAprocess is to demonstrate that with the implementation of necessary mitigation measures, theproject will not cause an unacceptable increase in the risk of flooding in areas upstream of ,adjacent to, or downstream of the development.

2. ROLES AND RESPONSIBILITIES OF THE DEVELOPER

2.1 The developer of azonal or district development project is responsible for:

(a) preparing the project profile and undertaking the DIA study if required;

(b) implementing all measures necessary to mitigate adverse drainage impacts identifiedby the DIA study;

(c) monitoring the project's drainage performance during construction; and

(d) taking all measures necessary to redress unanticipated or unacceptable impacts arisingduring project construction.

2.2 The application of the DIA process to a particular project should not be separated from theother basic investigation and design processes. Thus, the developer can integrate drainage,environmental, technical and economic assessments to produce the best and mostappropriate project design.

3. ROLES OF DRAINAGE AFFAIRS

3.1 DA is responsible for examining project profile; determining whether DIA study is required;approving DIA study report submitted under the DIA process; and advising the PlanningDepartment drainage conditions on the project.

Volume 8Developer's Guide December 2006 Page 33 of 47

Page 35: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

3.2 Notwithstanding that the developer may have submitted proposals in accordance with theguidelines stipulated in this Advice Note and DA may have accepted such proposals or haverequired such proposals to be amended prior to acceptance, DA shall have no liability to theproponent for any damage, injury, losses, claims, charges or fees which may arise from anyact, omission or negligence howsoever caused by DA, its agents, servants or employees.

4. THE DRAINAGE IMPACT ASSESSMENT PROCESS

4.1 The DIA process comprises two principal elements, a project profile and, if necessary, a DIAstudy.

4.2 All development projects for Zonal or Regional Developments will require the preparation of aProject Profile.

The project profile and DIA study require substantial engineering input and judgement, andshould be undertaken under the direction of a registered professional engineer in the CivilEngineering discipline. Any submission made as part of the DIA process should be signedand certified by the registered professional engineer in charge. Failure to submit asatisfactoryproject profile or DIA study report, if required, may unnecessarily delay the DIA?? process.

4.3 Development projects within urban areas served by an engineered positive stormwaterdrainage system will generally not require the DIA process to be completed as the projectprofile should contain sufficient information for approval, the exception will be thosedevelopments which are of sufficient scale to make a significant change to the drainagecharacteristics of a stormwater drainage system.

4.4 In areas not served by an engineered positive stormwater drainage system, the scale of thedevelopment, the form and location will determine the necessity of DIA process. As a generalrule, if the answer to any of the following questions is positive or unknown, DIA process shallbe applied to the project:

(a) will a natural drainage path be affected by the development?

(b) will there be a significant increase in impervious area and therefore a significantincrease in runoff from the development site?

(c) will reclamation or filling be required to form the site for the development?

(d) will the drainage system downstream of the development site require to be upgraded toconvey the runoff from the site?

(e) will the development be situated at flood prone areas?

(D will the development be situated in an area of high groundwater?

(g) will the development have substantial area of planting which will require irrigation?

(h) will irrigation cause a rise in groundwater levels that may cause concern for buildingand road foundations?

Project Profile

4.5 An outline of the information required for the project profile is given in Appendix I. Based onthe information in the project profile, DA will decide upon the extent and scope of the DIAstudy that is required by considering the likely impact of the proposed project on:

Volume 8 Developer's Guide December 2006 Page 34 of 47

Page 36: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

(a) the existing capacity of drainage paths;

(b) the changes in surface runoff hydrographs and flood storage; and

(c) the risk of flooding in other areas in the catchment.

(d) the risk of rising groundwater levels due to development.

Drainage Impact Assessment Study

4.6 The scope and requirements of the DIA study shall be proposed by the developer for DA'Sagreement. In setting the parameters for the study, a conscious effort should be made toconstrain its scope as far as practicable while ensuring that the validity of the study ismaintained. The findings of the DIA study shall be documented in a report prepared by theproponent for submission to DA and the Planning Department. An outline of the informationlikely to be required for a DIA study report is given in Appendix II.

4.7 The DIA study shall be carried out in accordance with the standards set out in by DA DrainageManual.

4.8 The findings of the DIA study will be used as the basis for setting any requirements ondrainage provisions, flood mitigation measures and performance monitoring tasks which maybe placed on the project. DA will advise the Planning Department or Lands Department ofsuch requirements on the project as appropriate.

5. DESIGN, IMPLEMENTATION AND MONITORING OF MITIGATION MEASURES

5.1 The developer shall be responsible for incorporating the drainage impact mitigation measuresinto the design of the project to ensure that the expected drainage performance of the projectis achieved. The Authorized Person in charge of the project should state in writing thatnecessary mitigation measures identified in the DIA study have been incorporated into theplans.

5.2 The developer shall be responsible for implementing the drainage impact mitigation measuresand undertaking the monitoring programme during the construction stage to ensurecompliance with the conditions on drainage requirements, flood mitigation measures andperformance monitoring requirements as imposed by the DA.

5.3 DA shall recommend the Planning Department to issue a Certificate of Compliance for adevelopment only if the imposed conditions on drainage requirements and flood mitigationmeasures have been fulfilled.

5.4 The developer shall sort out and agree with the maintenance parties on any requisitemonitoring programme during the operation stage. The responsibility for undertaking suchmonitoring programme, if necessary, shall rest with the maintenance parties. Depending onthe nature and type of the drainage works, the maintenance parties may be the developerhimself, his agent, other person or DA.

Volume 8 Developer's Guide December 2006 Page 35 of4?

Page 37: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

References

1 Qatar Sewerage and Drainage Design Manual

Volume 3 Surface and Groundwater Drainage

2 Qatar Highways Design Manual

3 Soakaways: BRE Digest 151

4. Scope for Control of Urban Runoff: CIRAI Report 124 1992

5 Interim Code of Practice for Sustainable Drainage Systems: National SUDS Working Group(UK)July 2004

6 Stormwater Best Management Practices in an Ultra-Urban Setting

US Department of Transport Federal Highway Administration

7 Statutory Instrument 1999 No. 1783

The Environmental Impact Assessment (Land Drainage Improvement Works) Regulations 1999 :DEFRAUK

Volume 8 Developer's Guide December 2006 Page 36 of4?

Page 38: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

APPENDIX 51 ·INFORMATION REQUIRED FOR PROJECT PROFILE

In order that the need for a DIA study can be assessed, the project profile should include all relevantinformation available. Information should be in note form. The checklist below is provided as a guide only,to assist in identifying major items which should be included or considered in completing the projectprofile.

1. 4.1.1.1 AN OUTLINE DESCRIPTION OF THE PROJECT

Provide the following information:

• Project title• Developer• Contact Person (name/telephone)• Nature and description of the project• Location (include plans)• Area of project site and %paved/unpaved• Finished site platform level• Whether planning permission application is required• Whether lease modification application is required• Statutory land use zoning• Recent and dated photographs to shown a panoramic view of the site

2. 4.1.1.2 AN OUTLINE OF THE PLANNING AND IMPLEMENTATION PROGRAMME

a) Explain how the project will be planned and implemented

e.g. authorized person/consultants/contractor.

b) Identify the project timetable for:

• appointing consultants/authorized person• planning/preliminary designs• preparing a Drainage Impact Assessment (DIA) study (if required)• finalizing designs• implementation• completion/commencing operation

c) Identify any interactions with other projects which should be considered.

Volume 8 Developer's Guide December 2006 Page 37 of 47

Page 39: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

3. 4.1.1.3 AN OUTLINE OF THE EXISTING DRAINAGE

Provide the following drainage details:

• A 1:20000 scale plan of the catchment in which the project site is located with the drainagesystem relevant to the proposed project highlighted.

• A detailed layout plan at 1:5000 scale or larger, of the project site with the site boundary,existing ground levels, existing drainage and existing land uses all identified both within andadjacent to the project site.

• A general description of the existing drainage including adequacy of the drainage systemand flooding history.

4. OTHER INFORMATION

Provide the following information:

• Potential drainage impacts (described in broad terms) arising from the project.• A general description of the proposed drainage impact mitigation measures (if any) to be

provided.• A general description of the proposed drainage system.• A general statement on the flooding situation upon completion of the project.

Any other available information relevant to Appendix II may also be submitted to facilitate DA indeciding whether a DIA study is required. Submission of sufficient information under thisheading may enable DA to make an early decision on whether exemption from submission of aDIA study can be granted.

Volume 8 Developer's Guide December 2006 Page 38 of4?

Page 40: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

APPENDIX SII· INFORMATION REQUIRED FOR DRAINAGE IMPACT ASSESSMENT STUDYREPORT

In order that the DIA study can be completed as quickly as possible, the DIA study report should includeall relevant information available. In addition to the information submitted in the project profile (AppendixI), the following information should be included in the report. The checklist below is provided as a guideonly, to assist in identifying major items which should be included or considered in completing the DIAstudy.

The findings of the D1A study should be documented in a report prepared by the proponent which will thenbe used as the basis for setting any requirements on drainage provisions, flood mitigation measures andperformance monitoring tasks which may be placed on the project.

1. AN OUTLINE OF THE CURRENT FLOODING SUSCEPTIBILITY AND PROPOSEDDRAINAGE

Provide the following details:

• An assessment of the susceptibility of the project site to flooding, preferably with arecord of any past flooding which occurred within or adjacent to the project site.

• An assessment of the groundwater levels within the project site and whether there is arecord of any previous problems within the site or adjacent to the project site.

• Adetailed layout plan, at an appropriate scale, of the project site with the site boundary,proposed ground levels and proposed drainage, including any necessary upgradingdrainage work within the catchment, and proposed land uses, all identified. If theproponent is aware that the ground levels or drainage or land uses adjacent to, butoutside the project site are likely to change, details should be provided if possible or,alternatively, attention drawn to the fact that changes are likely.

2. AN OUTLINE OF THE CHANGES TO THE DRAINAGE CHARACTERISTICS ANDPOTENTIAL DRAINAGE IMPACTS WHICH MIGHT ARISE FROM THE PROPOSEDPROJECT

Provide the following details to quantify the changes to the drainage characteristics of thecatchment arising from the proposed project:

• Changes in land use and surface runoff characteristics.• Changes to existing groundwater levels that might be expected.• Changes to surface runoff hydrographs for 2, 10, 25 and 50 years return period flood

Volume 8 Developer's Guide December 2006 Page 39 of4?

Page 41: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

events for the project site, any affected natural drainage paths or existing positive ornon positive drainage system.

• Change in flood storage caused by the project.• Assessment of timing of peak runoff from project site relative to timing of catchment

peak runoff.• Hydraulic capacity of existing drainage upstream, within and downstream of project site

if applicable. This information will be made available by Drainage Affairs .• Hydraulic capacity of proposed drainage upstream, within and downstream of project

site. This will depend upon the drainage systems designed by the developer.• Changes in peak runoff, peak flood levels and/or peak velocities for 2, 10, 25 and 50

years return period flood events at critical locations.• Details of temporary drainage during construction including hydraulic capacities.

Provide details of all potential impacts which might arise as a result of changes to thedrainage characteristics caused by the proposed project and identify land users who mightbe affected. Provide details of the impacts caused by the following:

• Changes in flood levels, flood frequency and/or velocities.• Changes in timing and magnitude of runoff peaks.• Changes to maintenance requirements and access for maintenance.• Changes to the drainage paths and regime during construction and after completion of

the project.• Cumulative effects taking account of other concurrent developments in catchment.• Other relevant considerations.

The potential impact should be considered on upstream, downstream and adjacent landusers, and land uses should be identified (e.g. residential, commercial, institutional,industrial, infrastructure, agricultural, recreational, conservation areas).

Volume 8 Developer's Guide December 2006 Page 40 of4?

Page 42: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Volume 8 Developer's Guide December 2006 Page 41 of 47

Page 43: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Appendix 1

Building Permit Application

Volume 8 Developer's Guide December 2006 Page 42 of4?

Page 44: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

DOCUMENTS TO BE SUPPLIED TO DRAINAGE AFFAIRS FORBUILDING PERMIT APPLICATION

Mandatory information is shown in bold type

Information Required (2 copies) Scale Notes

Both copies of submission will be stamped approved by the Drainage Affairs. One copy will be returned tothe Developer, the other copy will be retained by the Drainage Affairs

Developer's Programme

Estimated Construction Start Date

Site Location Plan (A3)

Drainage Services Location Plan (A3)

A4· Single Property

A3· Developments (Compounds, Mult)

Site Plan (A) showing: (Foul Sewer)

All levels related to Qatar National Datum

Site boundary

Building outline

Building with descriptive label

Internal Roads, Footpath

Internal Sewer Layout

Septic tank, soakaway, sewage holding tank

Drains and manholes

Schedules of foul manholes

Pumping Stations

Rising Mains

Existing sewers and drains

Road gullies/highway drains

Site levels

Site Plan (B) showing: (Surfacewater Sewer)

All levels related to Qatar National Datum

Site boundary

1:5000

1:1000

1:1000, or

1:500, or

1:200

1:1000, or

North sign, co-ordinates ofcorners, street names,principal landmarks

Existing pUblic sewerage anddrainage services adjacent tothe Site to which the site willdischarge

Manholes numbered fromMH1.

Diameter, length betweenmanholes, gradient flowdirection. All levels are in 'm'and Ref. To QNHD.

Arch. Levels and QNHDlevels.

Volume 8 Developer's Guide December 2006 Page 43 of 47

Page 45: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Building with descriptive label 1:500, or

Internal Roads, Footpath Manholes numbered from1:200 MH1.

Internal Pipe Layout

Soakaway

Drains and manholes Diameter, length between

Schedules of storm manholes manholes, gradient flowdirection. All levels are in 'm'

Pumping Stations and Ref. To QNHD.

Rising Mains

Existing sewers and drains

Road gullies/highway drains

Site levelsArch. Levels and QNHDlevels.

Building Drainage (A1) 1:50

Floor plans

Fittings and Sanitary fittings

Pipeline details

Discharge points

Gullies

Copies of hydraulic design calculations (A4)

Foul water (including trade effluents)

Surface water (including impermeable area planand attenuation details)

Design parameters used

Pumping Stations information showing:

General arrangement details

Wet well capacity

Rising Main Capacity

Volume 8 Developer's Guide December 2006 Page 44 of 47

Page 46: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Volume 8 Developer's Guide December 2006

Appendix 2

Design Unit Foul Flows

Page 45 of4?

Page 47: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Peak and Average Foul Flows Using Design Units Based on 270 IIh/d

Avg Flow Sewage Peak flowPopulation lIs m3/d lIs

1 0.003 0.259 1.64

5 0.016 1.382 2.53

10 0.031 2.678 2.82

15 0.047 4.061 3.09

20 0.063 5.443 3.35

25 0.078 6.739 3.51

30 0.094 8.122 3.62

40 0.125 10.8 3.83

50 0.156 13.478 4.03

60 0.188 16.243 4.22

70 0.219 18.922 4.41

80 0.250 21.6 4.59

90 0.281 24.278 4.74

100 0.313 27.043 4.86

Volume 8 Developer's Guide December 2006 Page 46 of 47

Page 48: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

State of Qatar Public Works AuthorityDrainage Affairs

Appendix 3

Drawings

Drg No.

DG1

DG2

DG3

DG4

DG5

DG6

DG7

DG8

DG9

DG10

DG 11

DG12

Title

Inspection Chambers - Typical Details Sheet 1

Inspection Chambers - Typical Details Sheet 2

MH1 - Standard Details

Typical Manhole Construction Details

Sewerage Connection to Properties - Typical Details

Typical Small Submersible Pumping Station

Sand Trap &Grease Trap - Typical Details

Septic Tank Type A&B GA Details (pops 1- 20)

Septic Tank Type CDEF GA Details (pops 21 - 350)

Soakaway Details

Stormwater Soakaway Details

Stormwater Tank

Volume 8 Developer's Guide December 2006 Page4? of4?

Page 49: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

1JQJTh1. ALL DKN5IOItS All! ItH1WHETRtS lJI,ESS DlHEftWISE STAna

2. TillS DRAM 10 BE A£,f,D1H CIlNJWlCTlDltWlTKAU A[LEVA~U1AlIHlltDnAl~S

iPrtKfllEAMFORCOVERS 3. STEP IRO~S 10 IE PROVIlED A' :JOOlIacone BOTH tlORIlCMAu..,Vl:RTKALLY I' DEP1HTO *VERT fXCUOS '110m

'.ALllmAIlAt.N!OOOERIlAlFACESOfTtECtW1BERSTOftPAMED

r-----n-f-----, WITtilWOClIATS0' CaAL l.utEPOX'ir------,5.HIJItU1(OWR10Pll'[ Dl'IMSPftlaN [IIMIUTo BE.OOIIIl

lXI

:~~I r-----,

l.FllRAllDIlIOkALLAlE!lAlCONIICTNI!OICt!flGSKALLIlfMllDfIEDI I I I I 'DSl.lTAkDfACII~tcN[(TIONBUlLTIMEXTEkDEDfjUlUla.

I ICOVDIIrFRAMETOSUlT I I I

C!NtAIPAA1'ETOSLnI I

I 15tIH.mAROPE~llli I I UI .. mCllARCPfttNIlo II I I I I I II I I I L ____ ...JL _____ ...J L _____u_____ ...J

PLAN ON COVER PLAN ON COVER PLAN ON COVER

'"~r,t5t '00 ... r 0" '" JO' t... .", ,.. 1M , ~M "

, ... 1M

~ r--J!!-

~'~~:~~\~r

1f.':: :.;::t~~ IE

{)/ r'~~;~ IE ,:;.. ~L ~IE

),' ~OJ ~ OJ ',:: - f-- - '-- -r-Er-- - - --3= -Er-- ::....-:~!rrr--:-- --3=i--- --1+-----1 i f--. . . - - --+f- Ii - --+ -- i

~- -- -- I-- -- c-~ --.~ .. ,,:':- '-- - f--

.:~ .:....·;~';n

......,...I ~:~\ \-

I'.~., ';15IDIAEXTR4&1AfHGTH .~;.. IE

~VI1llIfID (LAY PFE

~".:.,~ ." REV. AMEI<D~ENTS BY DA'T£e:, CONSULTANTS

SECTIONC) SECTIONC) SECTIONC9

CHAMBER TYPE'A' CHAMBER TYPE 'B'DRAWING STATUS

CClYEA l FIWE TO surEH12'a.WA15DlHAlOlllE

~1"---W1TNSEALINGPl.Al[ 1-'-'·105ll11UtCLLEAROP£Nk'&

ST£Il'IllOIt5-llRADESRC:lO HORTAIlIWJ[Kf«!TOrltAtR

J~':'-'J.AEGUl.AlNliCOlml5

'" ! DRAINAGE AFFAIRS

e-~::r i 't:': ~DPC2IlMS1TUCOlKRm e-~ ~~~~Rl~~tEoreETE P.O, 60)(23337..... ; TEL. 4950055 FAX. 4950555.., ~ ,:<:;:-- ~~=r~lr:~OW -, SU1 twfIOl.E fUME OPE"G SIZE -,

PROJECT.. liIWlE lAC 21 CONCRETEw: Cot«mE ILOClt'lilDRIC WAlLS

I- _ !"'ERNALBl.OCKWOllICfAaTOtlAVt 200 MC!HkALTlllClOE!S DEVELOPERS GUIDEGRNXOPC:tOHASS HAY£UlIIOCHlRTAlIl[IODtfUiCOJjCIl£1EWALLU.ut:---

~umocMaRrARAEtfIlERII6

LalHrC~HDRTARRE!IJ(RIIG bll! I

Z[ '.~:~ 0 GRADESIIC20

,0 lIIlADE SRI: 20 COlltJl£lElKNCIlttG TITlE.:.'";.:. " j,;~~

CQNCRETEeENCHIIIG . .~~ o\~~•~EIIl(20WESl.AB

':"'t~ 0,

r; INSPECTION CHAMBER",.......... ~,L.J"',,,."......

TYPICAL DETAILS","'HE_I< !l.L PROTECTlOt(&RAOESRt211 SHEETIPlltlTl!~&IWl[SRt20

1JQJTh UTHKBL15TKICILH MA5s(QNCAETE8A5E llIWlI!:sRI::n 1t.AB000DCSRCD""",.". SUIGIl4DESRtJ' t rtPr: 'A' AllWmM[Nl YO DE IIUD rOil V," Til' Ifa,.IlRAIKtl

eatll£t1llll1!: TO L\CH LOIrlG alE lFCHiMBrR DRAWN DII'T£ PROJECT CODE

SECTlONC9 2. TYPE'8'ARRAIIG£"'~Tl08EUSEOFDRJTOlIRANCH SECTION@ D~ NOV. 08 -COlINEnlO1tI TOEAl':HLOMISGE OF OlAMIlER CHECKED

DWM NOV. D6 PROJECT NO.J,ClASS DlIOHHCOVlR4'lWI! TO III; I15mlNTIlAfPl:KlD

CHAMBER TYPE 'A' (TYPE 'B' SIMilAR) .POS5aE It:AVY LlIADEDARUs. OTktRWlSEUASS CHAMBER TYPE '(' APPROVED -BUS C!M:R • FRAtE TO 8£ USlO JEA NOV. D6SCAl£ (Al)

DRAWING NO. REVISION

1:70 DGI•• a .._ •• _ ............._ ...... -'.•••

Page 50: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

mL- ..• ., (DkCRnEBACKFllL. " __'_,,-~~~h':. AS SPOOFED

'n¥n¥;~ lI-uAlil~

SECTIONC)

(SHGWlNG COVER FLUSH WITH FGL OETAILI

~l15D~

DATE'"AMENDI,IENTS

~DRAINAGE AFFAIRS

P.O. BOX23337TEL. 04950055 FAX. 04950555

DRAWING STAT\JS

REV.

PROJECT

11 BAR LOCATIONST TOft Ff fAIIFACf880TTllH U EACHfACE'" NEAR FAa: EW UCIlWAYAn ALrERlCATlY!!,lRSIIMRSEII."SIlDWWHERERE4UlREDI

CONSULT,6NTS

REINFOR[EMENT

TO"".....AS~~t·tll:"·LO' ..,..""'t'tP! (If SlUl. WTREnF BARS

BARtLlMETE BARHARK

lJQill;t.ILL OilOSlOI(S AAE III )tWMEJR[S UlUSSOTHERWlSE SlAT!D

Z. fXTDlHAL rAuS or OtAtelR TO R.,AMm wnHTWD (001115 II'BI'MINOU5PAllfT

J.lJfIEIlNAl. StIRfAas 1IF [HANSER WALL AI«I (OYER lOBE pAMED WRHlWOCllATSOFUW.1AREPOXYPAlIf'r

a

"

"

.!!.

"a

---.J

~

'"......

"bIoTUG3-15

"

tT17It.ftI:

T1Z I-f--I-"

,m '"• IF

StZl! MlIIlsTU ,TU I- -1'

!!.!!.u

v'AR

""";;!!.!!

~~OT

r-I

TU , •TU 1 •,,

~ 112 1 ".. TU ,

T12 t" Z'lSJu.8ElQINIiDINENSlllItSAAEICACCOADAlCEWlTHB~UI

• 5P!CftD 10 TtR t4Af1UT_• SPI!(flEDTDTHEII£"WSY2SlI11

mIKI&!WIlltRAlRD COWRDnU TOil[ 115tO IN utflAyn ORlHttsH!D=~¥Ji::=DETA" UBEUSWINAU.PAVEDOR

2. nus '0' caYERS "AVY DUTYI TO BE UWI FOR ALL IlCSl'mlOkCHAIeERIIN ~DAns OR ounrlTH PROPtIlTY aautl)ARYWAUS

a.AsS'I'CClV'ERSlM!IllLtfDl1JYJlOeEUSEDltAU.CASai\lftTHIkp.etaPERTVIICll/IIIA1tYWALLS'DABOTKRAlSEDAliDFlUSHDETAILS

"),311101-'14

~

SECTIONIt\

""BfA[OVER suaiiiOLi""

!ill!!.!l.AII_"'D.

{]~I I-II Dh~ I

PLAN ON COVER SLAB REINFORCEMENTIMINIMUM COVER TO REINFORCEMENT 10m.1

&-.c.1U05

.!l.

~MASstotomGll:lDESRtJO

~.7L=.

SECTlONC9

IIHDWING RAISED COVER DETAIU

DETAIL E9IFOR PIPES WITH COLLARS)

\~l ["r""""'''''''COVIR••" ., ". S!.A1tGRAD! llPOS. .

I ~r~"iiiE~~~"~'19 "Il,--.......... .p'" T5THlDCCOMCRll[

-Sl BUIlDlIlU!UDE IRC: nHASSCCWCRETEat:NOlItl6GRAIlESIlI:JOWlTK121tllCICEPOJIYMllRTARREIlIlI:lIItG

~i

-~

INSPECTION CHAMBER CLASSIFICATION

., D.D1 Dl

THlSDfTAillSfImSPIm.SO(l(ElPll£S.FCItPPESWITH tOLLARS S£f DETALJ

---.J

1",1 3DO 1610'D1'DlA

'02'01'\

~

DUCTllEIIlOltMA!ItIl[COYERI.FRAMElDSUlT'1SDIACLEAROPEItIltG

BEIlIlCllOH""r""''''''

ill NII.0IBHAMH.r-- ~~~,\':'..OHf:tvID~lf AIm:1 . QultEHEICIS

TYPICAL SECTION ON BASE

'M

,0.

III

&-

tlTtlUCSIllDCONCRflEBLOCKWOIIIlliAADElPCJ5SEDPEDIlt6TIICI(

""'"'-\"" SEWERAGESTANDARD DETAILS

TITLE

INSPECTION CHAMBERTYPICAL DETAILS

SHEET2

~~ "r.... TWOCOATRENtD50lP Cet«MTE N1ROl.tCl •CiWlESRCHTOCGVfRWITH •~DS[AARl5tS .~.

PRlWTcaYCRHAIIQRADEOPC]5 •_.._-~.1=

DETAIL E9'''D

DRAWN -=r.;D~ NOV. G6

CHECJ<EDDWM I NOV. D6

AFPRDVEDJ.... I NOV. 06SCAlE (Al}

1:20. h10

PROJECT' CODE

PROJECT 1\10.

DRAWING NO. IREviSlONDG2

CAD A'h I.:\O'TAR~STDS\OO2.d'Ng

Page 51: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

;li

j

--E!1

2H MANHOLE DETAILS

!!Qmi1. A~L QlH!M5l11NSARE IN I'tl.LtETRES UHLUS OUER\tI5! STATED2.Al.L COtKRE1E SHALL IE GlW)E OPC 21 t$,ESS GlIQWlSf STATED

lYAAlA1lIl!lTOSTAl/DARODElALSAllEPEIUtT1EDTDHE£T$l'T!SPfClPlCRUlUlJlDQTS

4. ALL .'S 8ETWfDt SEnlON$ Of GR1' LKWS SHlU BE LAHftAUD DYERWITH 101... WIlE RE5tI R!H &LASS TAPE aRAM APPRO'40IlSlTUBAlI)lGEJatn101HEOUtsID£O'1tf:IIPLlkERPIllOR10(OIKR£1I~

S"A&.lJQteTSBElWEEMPlPES,fIlCtURESl/IIGRPlJfER5SH1oU.I!sw.m

,. AU JOItTSBtTWEEN PIPES AIeD ClIMtllfTE SHALL lIE WATEnlll111.ALLltll:otIIIGPFES5HAl.LIELAlDSDffITTOSOfFn~ITtiTHEOlITGOIItG

'PI

PLAN AT COVER LEVEL

SECTIONC)

l2Ve~~Y(~rsl~nr

SECTIONC)

TITLE

BY I DATEAMENDMENTSREV.

DRAWN DATE I PROJECI CODEOM NOV. 06

CHECKEDDWM NOV. 06 I PROJECT NO.

APPROVEDJEA NOV. 06

SCALE (AI)DRAWING NO.. REVISION

1120 D03

DRAWING STATUS

CONSULTANTS

~DRAINAGE AFFAIRS

P.O. BOX23337TEL. 4950065 FAX. ...50555

rOUL SEWER t.4HlSTANDARD DETAILS

DEVELOPERS GUIDE

PROJECI

~I

j

~I~

-,

:P=z i :m~~Rm

GRPSEALN3Pl.ATE

~ ~~'V:toWRETE

CLASS DUO TO EM U4 t1EAVY OUTYDOUIU!1RlANGllARIIlICTJLElRdtCQ'RR&.fRAMEWITH'lSDlACLEARllPfNIcli

GAPLlItNlTOllEPCllNUIIMRTH1k6'rtf(NOIISLPSlA'ACE ~

IiiRl'LHHG10IlEl«HIN1I&!MVERTMlN.6THCNllIISLPS\lFA,Cl

TAltGNlI«ltlRANt&PflDTtnICN

e-..,....... II~

CAD Rd. IJ\ClATAR-SiDS\0G3.dw9

Page 52: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

DETAIL E91,10

LADPER ARRANGEMENT (8QTTOM!

!l!!lli;lALLDlt£NSIONSARflNtlUlKETRfSUNlfSSOTH£RWISESTATED

2.THlSORA\iWGTOSHOULDBEIlf:ADlNCONJUNCTIONWlTHDET.&I.SSHllWNON DRGNoLfS\fS2.fSJ"FSnl. FSZ4

3. All HATfJlIA1.S, FABRICATION AN:l CONSTflUCTlDN SHAll BE INACCOROAN:EWITHTHESPttfICATlOHS

4. VAIllATIIN TO STAHOARD Il£TAIlS ARE PEAturrm TO HEEl SITE SPECIFICRroUIREtlENTS

S.FORTAItQNGDETAIlSREFERToDAGNil.GEU

BDnDH RUNG TOefHAlCIKlttOFZ50ABDVfBflOllNGoRRESTPLATfDlll1

RESIMSPACEJl:TOSlJITlADDfRAl.IGNI'EHTIHAJC.l00THIClO Ii1lPSTRIURSTAlfrl.ESSSTEEL ANOJJR

BOLT BoTTCH FlXWG TO BEMAXlHUKOFnSABDYEBENCHING DR RfST PlATFOIltlFlXlNGS TO SE AT 1500CENTRESHAXt1tJH

DETAIL E91110

TANKING AT FORMATION LEVEL

DETAIL l'110

TANKING AT EXTERNAL CORtiR

TWO LAYERS Of WATERPROOfI1Et1BRAHEITANKHD

DETAIL C91,10

TANKING AT INTERNAL CORNER

DETAIL 1

'.'0TANKING AT GROUND LEVEL

GAADEDPClSRElNfORCfDD:lN:Ft£TE COVER SLAB

WHERE APPLICABLE

BY I OATEAMENDMENTS

PROJECT

CONSULTANTS

REV.

~DRAINAGE: AFFAIRS

P.O. BOX23337TEL 4950066 FAX. 4950665

DRAWING SfATUS

~

GRPLKll

~I

SECTlONE9

DETAIL

...

1.10 _

LADDER ARRANGEMENT !TOP! & HANDHOLO

EADllIlIIiil1ADEUPFRoH4No.SEGtlENTST5TIAOC

SECTIONC9

WHERE APPLICABLE

GRP PIPE COhl£CnON DETAILS

'c.J. 1·.··.01 L!J / BEDDlllIiKATERlAl.AS

"'["'..

DETAIL C)

ROCKfR PIPE. Sl'Il.iOTISOCKET ON UPSTREAH SlOEOF IWfIOLE " DOUBlESPIGOT ON.OOWHSTREAH StoE

vr PIPE (ONNECTION DETAILS

DETAIL 0

JOtlTB(TWUNGAPllNERl.PIPfTDBEllUlllATWOVERWfTH RESIN RICH liUSS TAP'

DETAIL C)1,10

TANKING SEAL AT PIPE EHTRY.u...LIlJ..fJW

WATfRPROOFHEH!IRAHE'COLLAR "If.3DO WIOE

4DI4IBlTUtIIIOUSHASTlCAUET

STARCUTWItoTERPROOFI1EttIIRAN£WORKED ARllUPIJ PPf I UPPEDWO.""'"

.!!l!!llPI'EJlIINTIS NOT SliOWNAN D.EVATIOH HR a.ARITY

WATERl'ADllftmlBRANECOllAR IIlH.)OO WIlE

STAItClITWAT£RPROOfKEHBRAI£WDIlKe:PAltOUNDI'lPt:.UpptDWlntCOlUA

DETAIL c:1110

TANKING SEAL AT PIPE ENTRY.EWilUII!fli

DETAIL OF PRECAST CONCRETESEATING RING UNDER MANHOLE COVER

IGRADE OPC 35 CONCRETE)SCALE 1:10

DEVELOPERS GUIDE

TITLE

TYPICAL MANHOLECONSTRUCTION DETAILS

DRAWN OATE I PROJECT CODEOM NOV.06

CHECKED

OW" NOV. 06 I PROJECT NO.

APPROVEDJfA NOV. 06

DRAWING NO. IREVISIONSCALE (All

1:20 &: 1:10 DG4(AD Itt" L:\OATAR-STDS\DG4.dwg

Page 53: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

1lQill,1. ALI. DlM!t(SIO/fS ARl! IN InUMETltES UN.ESS OTI€AWlSE: 11.1ID

2.111$ DRAWffG TO IEIllADfI H'ULIICTIDNWllttDRG Nu.FSlItfSt1

Sl.EEVEADAPllA

~I 'oo'1~",r---- ---.JL

CONNECTION OF EXISTING TO NEWDRAINAGE PIPEWORK

N.T.S.

BY I DATEAMEI<DMENTS

~DRAINAGE AFFAIRS

P.O. BOX 23337TB.. 4950055 fAX. 4950556

DEVELOPERS GUIDE

PROJECT

DRAWlNG stATUs

REV.

CONSULTANTS

fA.

'. II~ :' ..

TEEORlIBLIGl.f;U·Afttmllwrntll[!I)

Sl.nYfJlIllIT·

I'·

PLUG

INSPECTION CHAMBER(SEE ORG No. FS8)

r:.lt:-;~· "._~':

=INSPECTION CHAMBER

ISEE ORG No. FS81

.GL

'.1:; ;~.

~-=-r=ii~~~ ........

fl.

LAuaAL CONHR11l11lTil HAlM$fW[fl

LATtIlAlCOIIIIEl:TIOIIlDKAlItRWfR(SUDR&Mo.FS11l

TITLE

TYPICAL CONNECTIONS TO EXISTING PROPERTYDRAINAGE REQUIRING EXTERNAL INSPECTION CHAMBER SEWERAGE CONNECTIONS TO PROPERTIES

TYPICAL DETAILS

DRAWN -DATE I PRllJEDT CODEOU NDV.D6

CHECKEDDWM NOV.D6 rPRdJEcr NO.

APPROVEDJEA NOV. DB

SCALE 1DRAWING NO. REViSION

1:20 DG5

"tl[fR.'1 Ll\G'TAR-srDS\D05.dwg

Page 54: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

=aa~T~;ll~¥t~

P!tISI£DROADUW.

Flte5HED GllOUHD UVEL

SCREEDTIICXIPS

GAlP.:YALVE

F1.AA'G£ADAPTER

,,*,"RETIMYAl.YE

+ST50

IV

f.'RY

LEGEND,fRC

.!!QillitA.U IlKHSIlINS ARE IItHlLUE1IIS lII.m OTH£A\III5! S1.um

2.ALLLEYllSAREIk~lRESTDQATARHAT101tAl.HElGIlTDi\lIl4

1 ALL A[lIrfORtEII CDNUlm TOfI!0PC]5

4.ALLPIPEWORKtS DLIC1ILE lRCft OR STAH.!SS IUU mADE 3MlII.!5SlIClKAlEOOTII:RWIi!

S-DltfNSlll!t5lL£YD.S NlCATEII ARt: FllAUUl1RA1MPURPDS6OM.T

i--..J ~I i

! ij~

,..

SID.51•• iSIDEEPSUHP

51" OVElWL SlJIUCTUAAL COIrICRETE

I "" ~"I ""

AcassLAIIll£A

...

PlPES\lWORTSTO

UfM:EIlSAP!'ROVA~-""::::::::::t::::::-IK~~".~$:jjI/!=*",~~

0...... TO ~~~~~"'l,mI!iiliit'idll=!~$~j';.1i~D1iCHARGE!'WfHOLE-t

DAVlTSlKKET

DAVITFOI»IlATlONlOO.t,OO.ttlIDEEP

EXTRAtTFAHIaPTlOICALTOOIXIURUlllTI

."150 JOO. '00Qiiiii

~_ !!~~~~~~~WIT.~~l~:r"TJ.~m:MH'O'

I• ~IiEDEDGE$100lASItllRTRADllS

l~~Aftl~~~":\~------I-iH- X InEAIl OPUIIIIi ClltPLUE ImHPAClOCK .. ""SP

111 TO 10 llA AlMER Fc-i

1I9DIUALOCOUPI.Ni

PLAN AT GROUND FLOOR SLAB SECTIONE9

IJECT

DEVELOPERS GUIDE

BY I DATEAMENDMOOS

DRAWiNG STA1US

REV.

CONSULTANTS

~DRAINAGE AFFAIRS

P.o. BOX 23337TEL. <49500/15 FAX. _

-,

-,!i¥.t/iIlfoW/·.umtL"2MDlAVCSEW£R

~H'J=&7i'!

i§WATERPROOFTAIlIOIIG8OTIOHQFAllOORAC1PI'E

• SPIIIDlE UPOllT WooT

~HIfG A.u.INTEIlNALCONCRtTE~ilf.1It wn wr:L~ TOIlf GAP

~

~ 1:-:;""'''')[ I··~jo<.· I IOTIICTAlfCNlHEMBltAII:i ~ OPCIOPROTECTIONSCFlf£D

·?.TII(IflC2IBLIN_

'WATER PROllf TJdIICMI 2DtllACASTlllGlCPEkSTOCK

,..

e-

SECTIONC9

SECTIONE0 lITLE

TYPICAL SMALL SUBMERSIBLEPUMPING STATION

NOTE,­1.'tHEPUHPCON1ROLPAIIELlSAJlPRDX.IOI.'l'Hxlto

TttELEYE.LCOffTROLPAtm.ISAl'PRGX.1111l7Ol1'fO

2. CELL TYPE OEOllORl2ER WITH IIfTflilW. FAN NAY BE PROVIlEDTOMAINTAIN 1UIt CHAIl6ESPERHOllRIIt TtlE WEt~m

DRAWN DATE I PROJECT CODEOM NOV. 06

cHECKEDOWM NOlI. 06 I PROJECT NO.

APPROVEDJFA NOV. 06

SCALE (AI)1:50

Ci.D Rtf> 1.::\c»tTAR:':-srDS\OOe.d*V

Page 55: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

I !!I' I '"~

FGlPA~"REA

CLASSSt25CGY(R&FRAMETO--­surr,oa.taOCUAROPEHlN6

1!2.lli!tAU ElHEkSlDNS All( lie MUtlETAES KESS OTIERW\SE nAnD

z. ALL Jatmi IETWEEN PIPlWORIC Mf) (DNCAEn ARE TO BE WATERTIGIIT

LTRAYflWl£slt4S1l_50dALutlIItaA'tAIlllL[

4, tflL PAlIELS 10TRAY fRNES fRaH dlill A1.LNl~M

s.~::.m6RP~MS~::La..~~:r'J.V&lHGAIlOCASTlNSrTU.

I.ALLCCfrt(RnE lOBE C1.ASSEI UHLEl$01t£RWI5t SlATED

7.fDIITAIIIlIt4GDElAUREFERTDDR&Nll.F14~I

-~.

AllOOERHALfA(ESTO!ElAt«m

~\:l~t/NrTOlKGRP'-_--~:tiii--0o1'"i1l

:=:~:.::.. :iI, '~ .' ,"t" ,.. I ~t•• ~ .1 ~

7-f~--:----------lI II J

I II IL._ _ .J

:

ml ~,

Q,ASS ItUS(D't'ER &FAAtt:: 10S\IT 79 x60D tuAA lPfh1«i

LEGEND,

FGL F1JISH!OGRllUN9LML

ROOF PLAN!

I 15' II--J!.

SECTIONE9

SECTlONC9

DATEfrf

DG7

PRo.iECT--NO.

DRAWING NO. IREVISION

PROJECT CODE

SCoIL£ (AI)1:20 at 1:2

CHECKEDDWM I NOV. D6

~DRAINAGE AFFAIRS

p,o, eOX23337TEL, 495D055 FAX. 4950556

SAND TRAP Ie GREASE TRAP

DEVELOPERS GUIDE

PRo.JEcr

APPROVEDJEA I NOV. OB

TITLE

DRAWN '1 DATEOM NOV. DB

CONSULTANTS

DRAWING STATUS

R!.V. I AMENDMENTS

'"'fIftllOOII!

"12

PLAN

....•"/.'(

DETAIL E9 ;r.Il.IIllli.IlIl

'II51.

.. ....-_.;.J8. ""I~';,:~1''''~''''''_ti+- '- I - ---l-_ I --I - _: --- ~

.:. .. •••1

TAAnrpyfAMK6lrQ IH 4J!IH!tIft.tl

PLAN

GREASE TRAP

DETAIL C)prl!fQ!lATfpgRugTBAY

il

[tJ .[[J

E1-~~F---,

~I ii!....J

II

~I

1SDtlAaunnPPE

fQLPA'SPAIIEA

I'

...

",!:; "

I••:.~ •

" "',

,",=I-:-=:J--;-1--'

>~ ',' ~; ~ ;':,,' ,:"

~t .li:··t1":;1

"""'.

;fJRPLADDtRIOLTr:D

II

ul".fI5SUHPSECTIONE9

SAND TRAP(LARGEI

,.. I.!"

,~,,~

~":1~

L-j'~i;.:~ ~ '::: ~ .. '.:" '

T15fDlAllUTfIPE

"'''-.. . .--.: .... ~~::"'::~ ;. ~'it~lll:OlIIlSE

:.~, ,- \;:,:::(/.; AJ9'MlIH'''H5IIOVIR

I I

~J! ;~:!Y I ,:',-1I , i'.·- :"':I~

/: ;~'I; :. ; f-:~:-:"1.lI-';"'~'-:-1,', -----r--n

::: ':~:'J:.::' I TAItKNi TO AlJ, COIKR£U SURFACES," I I ~W~~

~ - •• :'". CDI«R£TECLAss'C'.I I.;; ',? ! .... I :~:.;...... 5[llf:m1O~9TtlK

/J~:L i;I1::~/'

j

§

Iv1t1\

(AD bl, I.l\OA.TAR-STDS\OO7.-11tg

Page 56: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

~b~rz~~f;lN iO~EcJfm~Y I lOO I 1185

"'"1350

1!!!I§;

1. All DIMENSIONS ARE IN HILLIHETRES UNLESS OTHERWISESTATED

2. INTERNAL fACES OF THE TANK TO BE PAINTED WITH 1(OAT OFBITUMINOUS EMULSION AN[) 2 (OATS OF BITUMINOUS PAINT

1 All FITTINGS TO 8E STAINLESS STEEL

4. FOR REINFORCEMENT DETAilS REFER TO ORG No. FS25

I.· 'I I,'"'.1 I.:~... I • :

r----------- ----lI I 1 II I 1 II I~ ':JI II L_ -~ II IL_____________ _ J

~-$$=t==-~t

',4._ .

"'" '1 j.~~ I,4. 'I I I

~

;!'

DOUBLE T'GRADE'COVER.675DIA

MDUTYLE

SECTION A-A PLAN AT COVER LEVEL

~~. ~. FALL ~",<:;:: ::::::: if::::::::; ;; !WL

T16@l15 (ON(RETE BLINDING LAYER

SECTION B-B

T16@l15OJY

SECTION C-C

TANK DIMENSIONS

TYPE I PERSONS LENGTH (L) WIDTH (WI BASE THICKNESS WALL T~I(KNESS I DIM XSERVED (INSIDE) (lNSIDEI H

A I nOlO lOOO 1000 l50 l50 I 150

8 I 1no 20 4000 1300 l50 l50 I 200

PROJECT

BY I DATEAMENDMENTS

~DRAINAGE AFFAIRS

P.O. BOX 23337TEL 4950055 FAX. 4950555

SEWERAGESTANDARD DETAILS

SEPTIC TANK lYPE A a: BGENERAL ARRANGEMENT AND

REINFORCEMENT DETAILS

REV.

CONSULTANTS

DRAWING STATUS

ml£

'DRAWN DAlE PROJECT CODEJM JAN. 14 -CHECKEDRK JAN. 14 PROJECT NO.

APPROVED -SN JAN. H

IREVISIONSCAlE (AI)

DRAWING NO.

1:25 DC8

~T16@l150

T12@l1501\

T16@l150~

~, ~

~

T16@l150~

"1

;iSl

"

~~I~!W6m ~e~IiRETE GRADE ope lO

I /'T12@l151

fA

0,

N'

Z

>:0

'r,~,~

".DRtf: L:\QTOOl29\OGB.GA &: RC.aw,

Page 57: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

./QlliJ1. ALL Qn'lENSIONS ARE IN MILllf1ETRES UNLESS OTHERWISE

STATED

2. INTERNAL fACES OF THE TANK TO BE PAINTED WITH 1COAT OF

STEP IRONS AT 300 CENTRES 150 DlA PIPE TOSOA~

BITUMINOUS EMULSION AND 2 COATS OF BITUMINOUS PAINT

HORIZONTALLY & VERTIC AllY OR BOREHOLE3. All fITTINGS TO BE S1AINlESS STEEL

C14. THE TOP lEVEL OF THE SCUM BOARD TO BE SDmm ABOVE

ttGHES1UWAGfLEY(l

.: .'';'

S. FOR REINFORCEHENT OETAilS REFER TO QRG NG. FS2fi

'W'1'1 ". 0-... .I, ";,'.. ,------------------------,

1<. 0. I I

AS

If----::l

i~- - ; I~I-~-

~3 I I I I

~ -tf;! /=:$-~

~ l_~~J I~ I1..:: ___

INLET PIPEWORK... I I

.''': L_f-----------------------~0' '. 0-

0' ;",' :".-

1000 T ~ l T OOUBl TRIANGULAR MEDIUM DUTYGRADE 'B' (ClASS 21 MANHOLE

SECTION A-ACOVER AND FRAME TO SUIT615 DlA CLEAR OPENING

TANK DIMENSIONS PLAN AT COVER LEVEL

TYPE PERSONS lENGTH III WIDTHIWI BASE THICKNESS WAll THICKNESSSERVED (INSIDE) (lNSIDEI H T DIM X

C 21 TO 40 4150 1600 500 400 300

0 41 TO 80 6000 2000 600 450 345

E 81 TO 100 6500 2150 600 500 375 [~

-F 101 TO 3S0 9150 2500 600 600 650

:= REV. AMENDMENTS BY DATE

CONSULTANTS

§lL REINFORCED CONCRETE GRADE OPC 30 I 150 IT12~1

SUSprNDED SLAB ./T12@11S~

"- DETAIL OF PRECAST WEIR" r- 0

DRAWING STATUS

~N SCALE 1:2

;< l-

rA I- ~o:; SCREED TO FAll

~kR:>: MIN. 25 THICK0

"- 150' '50 TEEN PRECAST CONCRET

--1-1GRADE 5RC 30 WEIR

r- JB HIGHEST SEWAGE lEYfl /' f- lO THICK MORTAR No.2--..

--!- ..W~

/ r- ~O@l150 75'15STAI;~ '.REINFORCED CONe.

T20@llS<l' STEEL ANGLE '.

116@1~~ I.

GRADE OPC 30 IN _ I-6 x 200 STAINLESS 'I

DRAINAGE AFFAIRS

WAll & BASE SLAB 116@115 116@11 STEEL SCUM BOARO P.O. BOX 23337

!"- lJ...-DETAI&- /---f46@11S0 '. . .',dj. TEL 4950055 FAX. 4950555

I- 1 0 If"' .b- 0

0 ~ PROJECT

T20@l151\-..--b- ~T20~

N .' -.116@115

I'- I'-' 0 K' '-. SEWERAGE116@11 0 L1<o ". STANDARD DETAILS

0 . ".- ~

011 .' '" .~".11TLE

- FAll..

II ~j'" III-s 4'". ~~. SEPTIC TANK TYPE C. D. E t F

GENERAL ARRANGEMENT AND

Ix. REINFORCEIAENT DETAILS

(ONCREl T20@l1So-"BLINDING lA m@lll

300 T DRAWN DATE PROJECT CODE

SECTION B-B SECTION C-CJ" JAN. 14 -CHECKED

DETAIL 1RK JAN. 14 PROJECT NO.

APPROVED -SCALE 1:10 SN JAN. 14-

SCAlE (AI)DRAWING NO. rEVISION

,.... "••. ,.\ ..............."\""'0,.'" ~ ..,. ..~.~1:25.1:10 AI: 1:2 DG9

Page 58: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

!iI.ffltlClMntT

'DDHAXftUM

TflfXlBlfJoftT

VPTOJlO

........,,,

OvtR," I 6tD HAXHlK

SIOKAXr.llHfRDH

I I .'os,_300-"10 I ~DHAXJMuH

mill;\ AU DtlEMAlllS ARllltHUtRTRES I'UIS OTt£RWISf: STATED

2.COHCRETEIlUHlESSOtTAlILDlDltfRWlS!.Au.IIf-Sl1VCDNC:RETESHAlL£lEGRADl

aPCIOAIOAllPIlECASTCDNCRETESHAllSEG!Wl£CPC»

1tOHCIIUPROTEtTIOHII AIlHlilf LAYER (If TANdili III ACCORDAIICE WITH SP!C«AlIONCLAUlE'

2H·1" SHALL ~E APPlED TO AlL EXT£RICAL MFAtES

bl All lPO'tllHAl SURFAtESD[Ct:PT EPOXY MORTAR COYUtlDSUllfA.CESARf TO Be (OAUa WITH Gilt COAT If IlCIut'lHOUli EKI.lSIOItNfJ TWOCGATSDPSlTIJMtNPAlIfT

•• 8UILDIMG Tt\lIt'J&l$TlluCTURtS

una

-.J

no-tloe

VAr-+-f'--l'- "~1'"

"~UDB >' I ±. I I

"~I'" '" I -'1- I I

m·1008

"'.UDB \ II '.,± I I

m·IOOB / :r:1

~I \11 II'o/f

DlAVARlES

lAOH STEPS TO !S 12'H SPACED AT lGlCENTERS HlIIaDllTALLV A/to YfRTlCAllV

__ L_".' I -

//" I ~....",I I \

---{ \:=1--- I /"-..... ,_r~ L_ ---+~--- _..LL--J .\ I\\\ ,

" ~ "....... _ I ,'"

-1--

PLAN OF SOAKAWAY ARRANGEMENT PLAN AT ROOF LEVEL PLAN

"BY I DATER<V. I AMENDMENTS

CONSULTN-rrS

SECTIONC)

COVER SLAB FOR SOAKAWAY CHAMBER

.VSPACm

""SSTA6f&AEO

M

" P~::~f::~:'~"~~-::d3t:~·_--

-+-L-!"l ii I. I

=,

SECTION ON CHAMBER RING

II

SOAKAWAY DETAILS

DRAWN DATE I PROJECT CODEOM NOY. 06

CHECKEDOWM NOV. OB rPROJEClNO.

APPRovEDJEA NOlI. 06

SCALE \A~""I ORAWING NO. TRE\OSION

0010

DRAWiNG srATUS

~DRAINAGE AFFAIRS

P.O. BOX 23337m.4950056 FAA._

DEVELOPERS GUIDE

PROJECT

STANDARD SOAKAWAYWITH CONCRETE BASE RING

;! :J;iW ~'-w ~; GAADEIIl(JlCOltWT£IJ,AH

j!:!1 til BI.OtDlIIGCDIlCIlETE

COIICIlETEttAIIIOilillADE511C2I\11IlHBlTUHEHPA'tTFN5tI

lilWESIlC)6PRECASTCOltCRET'fCoYEIlS1AII

CAIISHlDSTDII:SlIlRDllG'7!ruISlkWSlUWlTHlllTLEllUlOflNES

1TDlClIJRSESOf PRECAST CClHrRf:TElSAClOlBAltKSIIICLAlS1KORTAII

.TEllRA!ltfDLtIEDOVEIlTI£TOPOFCRUSttEDSrtNS~

STANDARD SOAK'AWAYWITH CONCRETE BASE

liIWlESRCHColitRET£BAsE

t a/:;J~(;;'ili*';M$i{'~ BLllIIl1tliCOIltRtTE

~I

J...I 0 °...::........:J:~~yc:f:!UCtlAHBfR

o n.....a I I .!.~~~~=.~·.n~.r:~~~_"!!'. I I I II ~ Cl 1II ..... 1 I I TITLE

675111500UBLEITRlAMGULAAOUCTL!IlOHCOVEAI.RUJt;W'rTH''lSDIAQ.EARqI'ENM

tAi'-A." L:\QA'rAfi=.STDs\D01D.clflll

Page 59: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

6QOKAlCtIUH

300HAXI1UH

'I5011AX!HUH

litFl,EXIlLEJOINT

OPT01DO

)1)lI-GtIo

.llDillltALLDIHENSIOflSAREWrtwItEmESLN..ESsoTHERWISESTATED

2.CONCllETEa)UNLESSOETAlllEll0Tt£AWlS£.AUIt-SITUCON:1lETfS1fAU.8fCilAOE

OPaOANO AlL PREtASTCONCRETE SHAll BE WDE OPtJa

3.CONCAfTEPflOncnoNII ASHGLE LAYER OfTANOlCiNACCORDoUlCEWlTHSPEClfICATIONCLAI20_~1.G6 SHALL BE APPLED TO AU EXTERHALSURFAW

bIALt.IfTERNALSWA(fSEXCEPTEPO)(yI1Oll:URCOYEREDSlRFACUARET06E COATED WITH ONE COAT OF BlTUI1INJUS EHULSlllN AIlD TWOCOATSOF8ITUMfNPAINT

4. BUlllIlNGTHROOliiSTRUCTlIl£S

10 125 B

126-100B

~

\I~T20-."

no-1IIOB / :6'1

no-ta" \ II'.. I I 1

nl·WOB

121-11108 7/ I ± I 1

~

D1AVAAES

I

/.~=+=,17 ~;:7 I ""i' I ~{ B\\--4.--- \\\ --\ 1/-

\.\ I /~ I /I~ -J /7

--=="-r-::.-~-9

I

~::a-~-8IllONSTEPSTOBSl14TSPACEOAT)ODL CENT£RS HORIZONTALLY "NDV£RTICAUY

/,--. -- ......./ "-

/ "-/ '/ \

/ \---~-;1\ I _ :-:r.:---: -:-:.:~ T --1----- ----

\ 1--- -\ I\ /

\ /, /'- /

'....... I ,/

--1--

PLAN OF SOAKAWAYICATCHPIT ARRANGEMENT PLAN AT SOAKAWAY ROOF LEVEL PLAN

SECTION C-CCOVER SLAB FOR SOAKAWAY CHAMBER

REV. I AMENDMENTS

CONSULTANTS

BY I DATE

SOAKAWAYICATCHPIT ARRANGEMENTSECTION A-A

DRAWN DATE I PROJECT CODEOM JAN. 07

CHECKEDDWM JAN. 07 I PROJECT NO.

APPROVEDJEA JAN. 07

IREVISIONSCALE (Al)

DRAWING NO.

,"" 0011

DRAWING STATUS

PROJECT

mtE

~DRAINAGE AFFAIRS

P.O. BOX 23337TEL. 4950055 FAX. 4950555

DEVELOPERS GUIDE

STORMWATERTYPICAL CATCHPIT a: SOAKAWAY DETAILS

~

l;

,g~mH"

lOG

m

l!I •. :::

".""t-.!!!.-

m

SECTION B-B

~;~::j). <:~;).I I

(Ehr!".,l Pi:

CHAMBER RING DElAIL

".

-E=tt---~~ ;;1 ~

11l!

-1;[ ---]1COATOFBlTUl"IHDll5D1UlSION&.ZCOATSOFBlrutltlOUSPAlNTTOlNTEANAl,.l-EXTEANALSURFACfS

HASS COHeAETE lASESLABliRADEOPC20

CUSS81Z5 "4NI1IlI.fCOVER I. fRAJ1E TO 5UlTlSOJ:UOClEAAOPENING

jf~~""''''''C'"''''£"'UIlOlWlTHBlTUHENPAlNTFlNSH

..... Y:~-'

~,

..I

) II i STEP IRONS

o

o

-0

o

o

~.::~.~

VAR£S

o

o

o

.\ , ..:"".~"'~;;. ~..," i

um DUTY COYER AN) FRAHE8SEN11l,CLASS04CIOWlTH~IlSDIAo.EAlIllPENING ..

i y<;, ~ ".1PItECASTtDNtRrnCOVEASLAB U5aI THKK WITHGRPLIlIHG.

PAE-CASTCONCR£TEOW18ERRlNliS

250 mocfilIAtMARS~UIlD

7$1111 SINGLE SIZE WITHumE ORHO fINES

lO... Ttl:KSRCZOBA5:E

1SIIIIITKUSRC151lLJr10~

II

==E~I

5hI111PfllFORATUlNS(OUALlVSPAaoATUCHl£YEL,VERTlCAL

·:~~~O.=~ ISrAGCiEJl[l)Svtll£TRlCALlY(

CADR." L:\QATAR~S1DS\OG'l.clwg

Page 60: 51589866 Ashghal Guide Qatar Sewerage Amp Drainage Design Manual

PlPEDlAI",ETtn 1 FLEXl:tJOIl(T,..

FlEXll\lEJOltfT

I lliI"AXtlUH~GlIHAXlHliHfRl»1

UPT031G flRSTJoI!(T

)"-40~ I )HKAXItlH ~t,%~~£RFlRST)lIINT'1!>l1HIICHUKANlI

OVER6DO I 6GaHlXlItlH 2:~PIPEDl,tMmR

HAXlHU'MfROHFRST JOINT

.!:!.Qlli:lJ.lllllHttlSlONS AAZ IN Hlli1ETRU Utfuss lIll1ERWlSfSTllEO

l.CoIlCIlfTEal IiHUSS OETAULEO OTHfRWISE, All ""mu eONCAIn SltALL II[GRAlIE

Of'UOAhtlALLP/I£CASTCOHCRn£5HALLBEGRAt!£OPC)t

J.col«:llmPROUClJON.j ASf'lG'.EUYERQF TAIlICIMGIN ACCQl1D.IJICEWITH SPEC!FKAT!OtfClAUSE

It-S·106SHAllBt APPl.I£nlOAU EXlERliAlSUilFACE!O

bl AU IIH£AAAl SU!lFACES rXCE9T EPOXY IWRlAR COVERED SURFA(ESARE TO 8[(OATED \l'1lI101tE COAT OF 8lTuHt!ouStHUlSlotiAtiD1WOCOATS OF I!ITIM:~ PAl!lT

4. l\UlI.OlNGlHIWUl!tlSTROCTlmES

PLAN

-+J~l~ ft:Y1 UD.""no-1MB ~"-----------------~~=i~~ '"nG.lt;B_~_

4"TZSB

Tl~"" ..!jut-jooa

~

DlAYAIl£S

1.

/.~;:-+!~~,;(/ ~

1.7 1 ~/,1 I ~

--i------~'\~il~ - - -~ I 11 -

~ I U'" [J'" I #"':::::..-.J. -9// '-..,.-;;:..~

I+.--/I~

PLAN AT STORMWATER TANK ROOF LEVEL

-

IRIJNSupSTOeS12,1,1Sf>ACEOA130CL tEKTERSI'\OIllIOkTAll'fAIlDYER1[,\llV

",.,...--, -- ....../ "-

/ "/ '\

/11\ \\ +8I \ J ----

~ I _ __~-i-~__I -:1==*=-- _' __ ,.---I.-:::l~T "I ---.f----- ----" , =±__.=rY\ I ?-___\ I J\ /

\ /'\ /" /

............ 1",.../

--1--

PLAN OF STORMWATER TANK/CATCHPIT ARRANGEMENT

I. ~I~>If

I,~

L......J

I ,n L~tJ"opdiiKGVARIES 401

SECTION A-AREV. AMENDMENTS BY I DATE

CONSULTANTS

COVER SLAB FOR STORMWATER TANK CHAMBER

';".:-, I'-(;~

I--r--I:,l '.. "\-':;";I.MAS5COHCllnEBASE

:';':'~:::_ ~~ :~ .:~~:~SlAIlGRADEOPOO

LlGliTDlfTYCGVERANDFRAHEeStllTZ4UASSOloOOWntl :l4'1501AClEAROPfHtlli

~

<~ ~",I

!i ~S4THK!'lEHBIW!EPROTECllOkGRADESR'24

~'H(BL.ttOikGCiRAOESRCN ~

". ~..

I'rmf~

OR!oWING STATUS

~DRAINAGE AFFAIRS

p;o, BOX 2J337TEl. 4950055 FAX. 4950555

PROJECT

DEVELOPERS GUIDE

TITLE

DRAWING NO. IREVISION

0012

PROJECT NO"

PROJECT CODE

-OWM I JAN. 07

DRAWN I~OM JAN. 07

CHECKED

sCALT(A-,)1:20

APPROVEDJEA I JAN. 07

STORMWATER TANK

SECTION A-A

·t··

":":'.( :.~\~~::~:·I J~~:; ,·~~.':f

~i

STORMWATER TANK ARRANGEMENTSECTION B-B

""""''''''''A''~ttr {:~ ~-:::_i ;::~ 4'1~ THICK SRC 25 8LHlI!tG Il!

J'M VARIES 15§L

C"'PI,r, l;\QATAR-~DC12.d'l'l9