Ministry of Environment Presentation (31!03!2014)

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ASSESSMENT AND UPGRADE OF THE ENTIRE WATER SUPPLY SYSTEM AT WATERBERG PLATEAU PARK FOR THE MINISTRY OF ENVIRONMENT & TOURISM Ministry: Engineer: Ministry of Environment & Tourism Denchi Consulting Engineers (Pty) Ltd Private Bag 13306 P.O. Box 80352 Windhoek, Namibia Windhoek, Namibia Tel.: (061) 284 2185 Tel: +264-61-228183 Fax.: (061) 226 380 Fax: +264-61-23 1703 E-mail: [email protected]: 01 April 2014 at 09:00

REVISED APPOINTMENT NO.: 25-2013/2014

INTRODUCTIONappointmentThe Ministry of Works and Transport appointed Denchi Consulting Engineers (Pty) Ltd to conduct a Feasibility Study for the upgrading of the entire water supply system at Waterberg Plateau Park for the Ministry of Environment & Tourism, Otjozondjupa Region on the 06 June 2013.

program of worksThe appointment was accepted in writing by Denchi Consulting Engineers (Pty) Ltd on 18 June 2013.

In accordance with the provisions of the consultancy agreement, the consulting engineer forwarded a preliminary programme of works to the Ministry on the 25 June 2013 for approval.

Employer The Employer is the Ministry of Works and Transport represented by Mrs D. Dube.

uSER clientThe User Client is the Ministry of Environment and Tourism, represented by Mr C. Lerch.

consulting engineer The Consulting Engineer appointed for the project is Denchi Consulting Engineers (Pty) Ltd represented herein by Mr D. Maxwell.INTRODUCTION (cont.)

LOCATIONGeneralThe project area (Waterberg Plateau Park) is situated in the Otjozondjupa Region.

The park is situated approximately 68 km east of Otjiwarongo.

The total area coverage of the park amounts to approximately 405km2

The Ministry of Environment and Tourism has two sites that are the subject of this study, namely:Ministry of Environment and Tourism (MET) Main Camp at Onjoka;The Okatjikona Educational CampTwo sites are 10km apart.

Otjozondjupa Region

Park ecological diversityThe Waterberg Plateau National Park is ecologically diverse and rich and has over 200 different species of bird with some rare species of small antelope on the lower hills of the mountain.

Due to a wide unique diversity of flora and fauna for thousand years, the Waterberg Plateau was declared as a National Reserve in 1972 to protect its species.

The plateau is largely inaccessible so in the early 1970s several of Namibia's endangered species were trans-located there to protect them from predators and poaching to extinction.

The programme was very successful and Waterberg now supplies other Namibian parks with rare species.

background

vegetation and topography (cont.)The Waterberg Plateau Park is characterised by its brick-red sandstone crowned with lush vegetation. The plateau has supported a wide diversity of flora and fauna for thousands of years. climateThe Otjozondjupa Region has two distinct seasons and is as follows:Hot-dry from May to September; andHot-wet from October to April. The mean annual precipitation (MAP) for the project area is 540 mm

temperatureThe average high temperature in the region is 23.1C. The annual average minimum is 14.7C to an average maximum of 34C. During the winter months, the daily temperatures drop to as low as 6.2C.

Background (cont.)MINISTRY OF ENVIROMENT AND TOURISMThe governing body of Waterberg Plateau Park is the Ministry of Environment and Tourism.

The Waterberg Plateau Park forms part of the 22 resorts that is currently being managed by the Namibia Wildlife Resorts.

Ministry of environment and tourism VisionThe Ministry of Environment and Tourism committed itself to be a role model in the conservation and use of biological diversity, promoting nature resource-based livelihoods environmental management and tourism development through innovation and partnership in order to contribute to rural development and economic growth.

In order to implement and enforce the above vision, the Ministry of Environment and Tourism dedicate itself to provide all necessary infrastructures required to meet its vision. The Ministry aims to provide:Adequate water supply to conserved places;Good access roads; andBuildings etc.

MINISTRY OF ENVIROMENT AND TOURISMDESK STUDYThe Engineer conducted a desk study to familiarise themselves with the task at hand and gather all available information regarding the project.

Typically, the information collated included the following:Existing drawings;Internet sources;Reports (studies carried out in the past); andTourist information.

SITE VISIT To enable the consulting engineers to conceptualise and understand the problem at hand, the Client, represented by Mr C. Lerch took the consulting team on a familiarisation tour (on the 08 July 2013) of the site to highlight some of the key issues and challenges facing the Ministry of Environment and Tourism.

It was stated that the Engineer will be required to undertake another trip to the site to survey the existing water reticulation infrastructure.

SITE VISIT (PRELIMINARY)stakeholder consultations Three (3) consultation meetings with the following stakeholders (Refer to Annexure E of this report):Ministry of Environment & Tourism (C. Lerch);Ministry of Environment & Tourism (H.B. Le Roux); andStaff at the Waterberg Plateau Park.

STAKEHOLDER CONSULTATIONsite visitThe consulting engineer spent two (2) days at Waterberg Plateau Park measuring and recording the existing water supply infrastructure.The site visit was guided by the staff of the Ministry of Environment and Tourism.During the site visit, the staff shared their knowledge with the consulting team and also highlighted the problems and challenges facing the camp in the provision of potable water and water for the wildlife at the park.

SITE VISIT (DETAILED)measurements takenDuring the site visit (03 and 04 August 2013), the consultant carried out the following:Assessment of the existing condition of pumps;Measurement of the size of the existing reservoirs and the determination of their respective capacities;Measurement of pipelines lengths, diameters, elevations (height);Assessment of the condition of existing valves and fittings (ball valves); andAssessment of the condition of existing boreholes (from information obtained from the Ministry of Environment and Tourism).

MEASUREMENTS TAKEN

site visitIn addition to the initial site visit carried out on the 08 July 2013, the consulting engineer decided to revisit the site on the 03 and 04 August 2013.

The consulting engineer spent two (2) days at Waterberg Plateau Park measuring and recording the existing water supply infrastructure.

The site visit was guided by the staff of the Ministry of Environment and Tourism.

During the site visit, both the sites at Onjoka and Okatjikona were visited. During the site visit, the staff shared their knowledge with the consulting team and also highlighted the problems and challenges facing the camp in the provision of potable water and water for the wildlife at the park.

SITE VISIT (DETAILED)measurements takenDuring the site visit (03 and 04 August 2013), the consultant carried out the following (briefly):Assessment of the existing condition of pumps;Measurement of the size of the existing reservoirs and the determination of their respective capacities;Measurement of pipelines lengths, diameters, elevations (height);Assessment of the condition of existing valves and fittings (ball valves); andAssessment of the condition of existing boreholes (from information obtained from the Ministry of Environment and Tourism).

SITE VISIT (DETAILED)consultants engagedDuring the site visit, the consultant was informed that other consulting engineers had previously carried out a similar assessment. As a result the consultant requested Consulting Engineers for information pertaining to the water supply infrastructure at Waterberg.The request was not forwarded to the consultant at the time when the report was compiled. As a result, any information collected by other consultants has been excluded from this report.

CONSULTANTS ENGAGEDLITERATURE REV IEWProvision of WATER SupplyThe Governments objective in supplying water is to ensure that there is sufficient water available for all users (either people or animals) by means of: pipelines; canals, boreholes, storage dams and reservoirs.

Namibian Constitution and national water policy white paperNamibia ConsititutionArticle 95 (l) of Namibia Consitution allows the maintance of ecosystems, essential ecological processes and biological diversity of Namibia and utilization of living natural resources on a sustainable bassis for the benefit of all Namibia both present and in future.

STUDY UNDERTAKENPURPOSE OF THE STUDY:To provide the decision makers within the Ministry of Environment and Tourism with sufficient information to plan and execute the upgrading of water supply system for Waterberg Plateau Park

Project is subdivided in the following phases:Data collection;Stakeholder consultation;Site survey and investigation;Assessment of the adequacy of the water supply infrastructure;Proposed upgrading;Quantification and cost estimation; andRecommendation of the preferred infrastructure.

DATa collectionThis stage of the project entailed the collection of the basic information regarding the existing water reticulation infrastructure.

Typically, information collected was as follows:Background information on the park;Measurement of the existing water reticulation infrastructure; andAssessment of the condition of the existing water reticulation infrastructure.

STUDY UNDERTAKENsite survey and investigation

The purpose was to:Survey the existing water supply infrastructure;Assess the existing water supply points;Observation of the condition of the existing water supply network; andDetermine the capacities of the existing reservoirs as well as their positions.The measurements taken on site comprised of a series of hand-held Geographic Positioning System (GPS) coordinates to determine the positions of the respective infrastructure and determine the hydrostatic height of the infrastructure namely reservoirs.

SITE SURVEY & INVESTIGATIONassessment of the adequacy of the water supply infrastructureThe assessment of the existing infrastructure was determined by quantifying the existing and future water demand. Demand was determined by estimating the average daily water usage.Assess the adequacy of the existing water supply infrastructure it was of prime importance to determine the numbers of wildlife at the park. Recommended the upgrades required.Quantification and cost determination. Cost estimates (derived from the market related prices).Estimate obtained can be used for budgeting purposes.

ASSESSMENT OF ADEQUACY OF WATER SUPPLYactivities completed

data collectedHistory of Waterberg Plateau Park;Ecology of the project area;Mission/vision for the Ministry of Environment and Tourism;Stakeholder consultations;Existing water reticulation infrastructure condition;Existing water supply infrastructure.

Site survey completedThe assessment of the adequacy of the water supply infrastructure was carried out using basic hydraulic engineering principles. The former was achieved by determining the following:Taking into account the differences in height (HRES) of each reservoir or water storage facility;Head delivered by the existing pumps (HP);Calculation of the head losses in the water supply lines (hf);Comparing Hp and hf to assess the adequacy of the provided pumps to supply the critical stations situated along the existing water supply network.For analytical purposes it was assumed that typical flow rates in the network range between 3 and 6m3/hour (maximum).

Assessment of adequacy of water supplyFrom the information collected during the site visit (at the following locations: (Containerised Pump Station, Onjoka Main Camp & Plateau and Okatjikona), the following key observations were made.

Containerised Pump Station at the CanalThe Onjoka Main Camp is being supplied by water from an existing canal;The water is extracted from the canal by pumps situated in a steel container;The length of the pipeline from the canal is 6,063m long (galvanized mild steel);To assess the adequacy of the provided pumps, the consultant analysed the existing system and the following conclusions were drawn:

Collected information Canal Pump Station to Main CampCanal Pump Station Elevation: 1,386.1mMain Camp Elevation: 1,457.4mPumping Main Diameter: 75mmPumping Main Distance: 6,063mGeodetic Head= 1457.4 1386.1 = 71.3mFriction Head Loss = Length x Loss per 100m (75mm)/100

Pumping Rate m/hGeodetic Head (m)Friction Head Loss (m)Pump Total Head (m)Pump Size (kW)6.071.314.886.1 (SPSA-21)4kW7.571.322.193.4 (CM10-7)5.8kW10.571.340.6111.9 (SP-17)7.5kW12.071.351.8123.1 (SP-17-14)9.2kWTotal2131--

Collected informationContainerised Pumpstation (Canal)The pumps installed at the pump station are Grundfos CR10-16A rated for a head of 129.4m, 5.5kW, 10m/h.

Ministry of Environment and Tourism Main Camp (Onjoka and Plateau)Existing water supply system comprises of: 3 x boreholes, 2 x pumps, 2 x concrete reservoirs (98.2m3), water tanks (6 x 10,000L), galvanised steel pipes and valves.Problems identified:Existing Infrastructure:Existing infrastructure is old and needs urgent attention-1959).The bottle neck in the entire water supply infrastructure seems to be pumps that deliver water to the top of the plateau; andThere is little or no information available on the existing boreholes.

Collected information

Existing windmill at the farmhouse

Existing pipelines supplying water reservoir

information collectedExisting Pumps:Existing pumps are under tremendous strain due to the head required to be deliver to pump the water to the top of the plateau; andExisting pumps are manually switched on and off and thus often run for long hours.

Personnel reservoir at Onyoka Existing Boreholes:There are three (3) potable water boreholes supplying potable water to personnel at the MET camp at Onjoka. One of the three boreholes is not working (due to over-extraction of water);There is an existing borehole situated approximately 5 km from the farm house and is not in use;There are two additional boreholes at the new farm that are also currently not in use; Information relating to the existing boreholes was sought but could not be found even in the National Borehole Register compiled by Namwater and Rural Water Supply respectively; andThe assessments on the flows in the existing water pipe lines were based on typical borehole yields found in the vicinity of the project area (between 1.5m3/hr to 6m3/hr).

Information collected

Old borehole (farmhouse) Existing borehole at Okatjikona

Typical configuration at a patrol camp Ball valve at a water pointInformation collectedTypical configuration at a view pointStop valve manholes (OuPos) Existing pipelines and reservoirs:There are no non-return valves/are no pipeline markers constructed along the pipelines;Existing reservoir at the farm house is not in use;Existing pipelines do not have air release valves;Positions of existing valves are not marked;Certain pipelines are corroded and need to be replaced (Antephora);Some ball valves at the water points require replacement; and No telemetry system between the various pumps and the existing water reservoirs.There are no drawings of the existing water supply infrastructure; andNo telemetry system between the various pump room and water reservoirs.

Informationa collected

Existing water tanks at Okatjikona Typical size of water reservoir Typical layout of a tourist camp Information collectedTypical size of water reservoir

Typical manhole at an animal Typical animal water pointSupply at the Plateau:The water at the top of the plateau is provided through a series of 40mm and 50mm galvanised steel pipes.The majority of the lines appear to be in a reasonable condition.

Animal Drinking Water:Animal drinking water is supplied by water troughs. The existing water troughs are gravity fed from the existing reservoirs.

Assessment of the pump requirementsA brief assessment of the existing pumps was carried out to assess whether the installed pumps were correctly sized.From the computed head losses it was evident that the existing CEMO pumps are under enormous strain as most of the time the pumps were working close to or outside their respective operating limits.

Information collectedLocation (Distance)Elevation (m)Geodetic Head (m)Friction Head Loss (m)Pump Total Head (m)Main Camp (o)1457---Ou Pos (3,707m)157812120.2141Duitsepos (8,556m)159113447181Huilboom (1,6328m)162016389252Geelhout (20,824m)1641184113297Location (Distance)Elevation (m)Geodetic Head (m)Friction Head Loss (m)Pump Total Head (m)Main Camp (o)1457---Ou Pos (3,707m)157812147168Duitsepos (8,556m)1591134107241Huilboom (1,6328m)1620163205368Geelhout (20,824m)1641184261445Main Camp Pipeline to Geelhout (Head Requirements)

Information collectedHead-Loss in pumping main (Main Camp to Geelhout Reservoir) Flow = 4.8m3/hr

Head-Loss in pumping main (Main Camp to Geelhout Reservoir) Flow = 3m3/hr

Location (Distance)Elevation (m)Geodetic Head (m)Friction Head Loss (m)Pump Total Head (m)Main Camp (0m)1457---Ou Pos (3,707m)157812170191Duitsepos (8,556m)1591134160194Huilboom (1,6328m)1620163306469Geelhout (20,824m)1641184390574Location (Distance)Elevation (m)Geodetic Head (m)Friction Head Loss (m)Pump Total Head (m)Main Camp (0m)1457---Ou Pos (3707m)157812120141Duinedam (6228m)163517839217Kiewiet T-Off (9,147m)163718050230Eelandsdrink Tee-Off (11,345m)161115462216Farmhouse (26,490m)154083144227

Information collectedHead-Loss in pumping main (Main Camp to Geelhout Reservoir) Flow = 6m3/hr

Head-Loss in pumping main (Main Camp to Farmhouse) Flow = 3m3/hr

Location (Distance)Elevation (m)Geodetic Head (m)Friction Head Loss (m)Pump Total Head (m)Main Camp (0m)1457---Ou Pos (3,707m)157812147168Duinedam (6,228m)163517878256Kiewiet T-Off (9,147m)1637180115295Eelandsdrink Tee-Off (11,345m)1611154142296Farmhouse (26,490m)154083332415Location (Distance)Elevation (m)Geodetic Head (m)Friction Head Loss (m)Pump Total Head (m)Main Camp (0m)1457---Ou Pos (3,707m)157812170191Duinedam (6,228m)1635178117295Kiewiet T-Off (9,147m)1637180172352Eelandsdrink Tee-Off (11,345m)1611154213367Farmhouse (26,490m)154083497580

Information collectedHead-Loss in pumping main (Main Camp to Farmhouse) Flow = 4.8m3/hr

Head-Loss in pumping main (Main Camp to Farmhouse) Flow = 6m3/hr

Pump Requirements for 3m3/hr (Main Camp to Ou Pos)Geodetic Head = 121m;Pumping Main Length = 3,707m;Pumping Main Diameter = 50mm;Head Loss for = 3m/hr flow = 20m;Pumping Head = 141m; andPump Selection: 2 x Grundfos CR15-7, 5.5kW, 380V.Pump Requirements for 3m3/hr (Main Camp to Farm House)Geodetic Head = 83m;Pumping Main Length = 167m;Pumping Main Diameter = 50mm;Head Loss for 3m/hr flow = 144m;Pumping Head = 227m; andPump Selection: Grundfos Hydro Multi-S2 CR3-31, 3kW.

PUMP REQUIREMENTSPump Requirements for 3m3/hr (Main Camp to Geelhout)Geodetic Head = 184m;Pumping Main Length = 26,490m;Pumping Main Diameter = 50mm;Head Loss for = 3m/hr flow = 113m;Pumping Head = 297m; andPump Selection: Grundfos Hydro Multi-S2 CR3-31, 3kW, 380V.

Conclusions on the pump requirements In accordance with the pump computations derived above, it is hereby proposed to install the following pumps:Pump: 2 x Grundfos CR15-7, 5.5kW, 380V at the Onjoka Main CampPump: Grundfos Hydro Multi-S2 CR3-31, 3kW, 380V at Ou Pos.

Observations madeASSESSMENT OF THE EXISTING PIPELINE (GALVANISED MILD STEEL AND UPVC) INFRASTRUCTUREPipelines at Waterberg comprises of galvanised mild steel pipe network (40mm and 50mm diameters). Existing lines found to be in a reasonable condition with the exception of the line to Anthephora (1,877km long).The consultant did not explore the possibility of upgrading the entire water supply network from galvanised mils steel to uPVC. Due to the terrain, the installation of uPVC pipes is not the preferred option due to the following reasons:Pipes will have to be laid at a depth in excess of 500mm (trenching required);All pipes laid will need to be bedded; andIn rocky terrain certain sections of the line will have to be encased in concrete.

AssessmentsIf existing galvanised mild steel pipes were to be replaced (in excess of 48 km) the cost would be in excess of N$ 7,53 Million;The consultant took note that if the water supply lines were to be upgraded then the friction head losses in the pipes will be significantly reduced.

(ONJOKA MAIN CAMP):Replace the two 2 x 50 mm galvanised steel pipes supplying water to Ou Pos with a 75mm galvanised steel pipe;Install non-return valves along the 3,707m pipeline route;Install air release valves at the high lying points along the pipeline route;Re-do water pipework at existing ground tanks;Supply and install duty/standby pumps (2 x Grundfos CR15-7) for water transfer to the new ground water storage at Ou Pos;Construct new structure to accommodate the new pumps at Onjoka;Supply and install 1KV supply point, to supply Ou Pos pump station with 11KV as well as a standby generator.

Assessments & recommendationsRECOMMENDATIONS (OU POS):Provide new 320m3 ground water storage (steel);Provide a pump control board at Ou Pos;Replace the two manholes with existing valves and the associated fittings;Supply and install duty/standby pumps (Grundfos Hydro Multi-S2 CR3-31, 3kW, 380V;Construct new structure to accommodate the new pumps;Construct protective fence around the pump and reservoir installation;Supply and install pressure control switches at the ground water tank to prevent the reservoir from overfilling and running dry;Provide proper pump control board;Install 11KV/400V transformer and standby generator.

recommendations(PLATEAU):Re-do water pipework (where required) to reduce pipe friction losses;Install pressure control switches at the ground water tank to prevent the reservoir from overfilling and running dry;Carry out a study to assess the yields and depths of the three (3) boreholes on the plateau.

RECOMMENDATIONS OKATJIKONA EDUCATIONAL CENTREThe Okatjikona Educational Centre is supplied by potable water from an existing borehole. There is no borehole data available to confirm the yield of the existing borehole. During the site visit, it was confirmed that the site never runs out of water. Water from the borehole is pumped manually into four 10,000 litre ground storage tanks.In addition to the above, there are tanks situated at 167m and 17m on the plateau slopes. The two elevated tanks, have capacities of 10,000L and 5,000L respectively. The outlets from the elevated tanks supply water to the existing buildings, as follows:A 32mm diameter line (HDPE) that supplies the closest house plus additional buildings (there is no information available on existing reticulation routes); andA 75mm diameter uPVC line services the rest of the complex (no information on existing reticulation layout).

assessmentsThere is a 50mm diameter galvanised mild steel (GMS) pipe that runs from the existing freshwater, past the housing units to the water through. A recent modification carried out was the installation of the a Tee with a 25mm HDPE hose pipe which is used to manually fill the four (4 x 10,000L) ground tanks with water from the spring. Appears that water being supplied by the spring water is preferred to the borehole water.

Problems identified:Borehole pumpRecent construction of the office building (access to borehole is restricted).Borehole maintenance (will be problem) The borehole pumping main supplying potable water to the ground tanks needs to be properly installed. A proper protection steel structure need to be constructed around the borehole pump infrastructure.

assessmentsPOTABLE WATER TRANSFER PUMP:The transfer pump is a single phase pump installed on the same concrete plinth as the borehole. The pump is started via an open circuit breaker lying next to the pump. There is no motor protection and no pump control board. The pump is manually operated. There are no level switches at the elevated tanks (5,000L and 10,000L) to automatically allow for the control of the pumps; andThere is no standby pump. Should the existing pump fail, or if it has to be repaired / replaced before water supply is restored.

AssessmentsSUPPLY PIPEWORK TO COMPLEX:The water pipes supplying potable water from the elevated (5,000L and 10,000L) tanks are partially exposed (lying on the pathway)

ANIMAL DRINKING WATER TO WATER TROUGH:The 50mm GMS pipe supplying the animal water trough has been blocked for some time. No water is being supplied to this trough.

ASSESSMENT OF THE PUMP REQUIREMENTSAn assessment of the existing pumps was carried out to assess whether the installed pumps were correctly sized.Geodetic Head = 1413,7 1396,2 = 17.5mPumping Main Length = 167mPumping Main Diameter = 50mmHead Loss for 2m/hr flow =(0,291 x 167)/100 = 0.5mPumping Head = 18m

assessmentsConclusions on the pump requirementsThe existing pump is correctly sized.

RECOMMENDATIONS (OKATJIKONA EDUCATIONAL CENTRE):Construct protective steel structure (palisade fence) around borehole installation;Re-do water pipework to ground tanks;Supply and install duty/standby pumps for water transfer to the elevated tanks. Include start stop level control switches (Flygt) at the elevated tank and no-flow protection to avoid pumps running dry. Provide proper pump control board.Replace water supply pipework from existing tanks to the building complex.Replace blocked pipe that supplies the animal drinking through.

RECOMMENDATIONSELECTRICAL SUPPLY

General:The current main camp pump station electrics are in working order although repeated changes and / or maintenance work has resulted in an installation that is in need of replacement. There is no standby electrical power available.The only electrical power on the plateau is a 50kVA 1000V/400V transformer at the Bohma site. There is no electricity at the proposed Ou Pos pump station.

Recommendations:The proposal calls for a new pump station to be constructed at Ou Pos, some 3.7km from the main camp 22kV supply line.The construction of an overhead 22kV line is problematic because of the terrain (up the escarpment) and also the danger inherent to animals like the giraffe.

RECOMMENDATIONS

Our proposal is therefore as follows:Construct a 22kV/11kV supply point at the main camp site in conjunction with CENORED, the supply authority.Supply and install 4km of 11kV XLPE underground armoured cable to the proposed Ou Pos site.Supply and install a 75kVA 11kV/400V transformer and associated LV equipment.Supply and installation of standby generators (silent, canopy type) at both the main camp pump station and the proposed Ou Pos pump station

RECOMMENDATIONSDescriptionNumber ofNo. of UsersBulk Fact.=2Unit Demand (l/day)Total Demand (l/day)Total Demand (m)/dayTotal Demand (m)/yearStaff5510202000.20073Leaners 484896201 9201.920701Boarding school learners484896706 7206.7202 453Office5510656500.650237Game5050100505 0005.0001 825Open space10510656500.650237Fire Water11130 00030 00030.00010 950Total167162--45 1404516 476During the site visit, it became apparent that the water supply system at Waterberg comprised the following: Potable water supply system for park personnel; and Game water supply system.The existing potable water supply comprises of the infrastructure at: Okatjikona Educational Camp Onjoka MET Main Camp. Game water supply infrastructure is the infrastructure situated on top of the plateau as well as the existing storage facilities provided that MET Main Camp at Onjoka.

Potable game water supplyDescriptionNumber ofNo. of UsersBulk Fact.=2Unit Demand (l/day)Total Demand (l/day)Total Demand (m)/dayTotal Demand (m)/yearStaff52040208000.800292Office5510656500.650237Open space10510656500.650237Fire Water11130 00030 00030.00010 950Total2116--32 1003211 717A detailed analysis of the water demand at Okatjikona yielded the following: Potable Water Storage Required = 45m3Existing Water Storage = 80m3Additional Storage Required (Yes/No) = No

Potable game water supplyDescriptionExisting Storage (m)1 x Duitse Pos Reservoir98.21 x Huilboom Reservoir98.21 x Geelhout Reservoir98.21 x Duine Dam98.21 x Kiewiet Reservoir98.21 x Farm Reservoir98.2Total589.5A detailed analysis of the water demand at Onjoka yielded the following: Potable Storage Required = 32m3Existing Water Storage = 98m3Additional Storage Required (Yes/No) = No

Potable game water supplyDescription``Number ofNo. of UsersBulk Fact.=2Unit Demand (l/day)Total Demand (l/day)Total Demand (m)/dayTotal Demand (m)/yearBuffalos8008001 6005080 00080.00029 200Giraffe1801803605018 00018.0006 570Eland4004008005040 00040.00014 600Sable1001002005010 00010.0003 650Roan1501503005015 00015.0005 475Rhynos (Confidential)0005000.0000Small Stock326326652127 8247.8242 856Total1 6301 630163 00016359 495Detailed analysis of the water demand at the Waterberg Plateau yielded the following:Game Water Storage Required = 163 m3Existing Game Water Storage = 589 m3Additional Storage Required (Yes/No) = No

Potable game water supplyUPGRADING REQUIREDFrom the analysis of the existing water supply infrastructure, the following upgrading options are proposed:

Onjoka Main CampReplace the two 2 x 50 mm galvanised steel pipes supplying water to Ou Pos with a 75mm galvanised steel pipe;Install non-return valves along the 3,707m pipeline route;Install air release valves at the high lying points along the pipeline route;Re-do water pipework to ground tanks;Supply and install duty/standby pumps (2 x Grundfos CR15-7) for water transfer to the new ground water storage at Ou Pos;Construct new structure to accommodate the new pumps at Onjoka;Supply and install 1KV supply point, to supply Ou Pos pump station with 11KV as well as a standby generator.

Ou PosProvide new 320m3 ground water storage (steel);Provide a pump control board at Ou Pos;Replace the two manholes with existing valves and the associated fittings;Supply and install duty/standby pumps (Grundfos Hydro Multi-S2 CR3-31, 3kW, 380V;Construct new structure to accommodate the new pumps;Construct protective fence around the pump and reservoir installation;Supply and install pressure control switches at the ground water tank to prevent the reservoir from overfilling and running dry;Provide proper pump control board;Install 11KV/400V transformer and standby generator.

QUANTIFICATION OF PROPOSED UPGRADING Waterberg PlateauRe-do water pipework as indicated on the drawing to reduce pipe friction losses (where required);Install pressure control switches at the ground water tank to prevent the reservoir from overfilling and running dry;Carry out a study to assess the yields and depths of the boreholes on the plateau;

okatjikona educational centreConstruct protective steel structure (palisade fence) around borehole installation;Re-do water pipework to ground tanks;Supply and install duty/standby pumps for water transfer to the elevated tanks. Include start stop level control switches (Flygt) at the elevated tank and no-flow protection to avoid pumps running dry. Provide proper pump control board.Replace water supply pipework from existing tanks to the building complex.Replace blocked pipe that supplies the animal drinking through.

QUANTIFICATION OF PROPOSED UPGRADINGCOSTING OF PROPOSED UPGRADINGThe funding required for budgeting purposes is as follows:

Onjoka main camp, ou pos & plateau(a) Construction Cost (Civil): (N$) Clearing 55 000.00Length of GMS pipe (50mm)1 039 125.00Length of GMS pipe (75mm) 964 600.00Excavation/Backfilling 512 325.00Air Release Valves 140 000.00Pressure Control Valves 264 000.00Marker Blocks 13 250.00Thrust Blocks 9 350.00Gate Valves 58 000.00Pipe Fittings 275 000.00Water Meters 26 400.00

(N$)Construction of manholes (Ou Pos) 7 600.00Grundfos Hydro MPC-S 2 CR15-7 96 200.00Installation & Commissioning of above 60720.00Grundfos Hydro MPC-S 2 CR3-31 56 800.00Installation & Commissioning of above 60720.00Installation 320m Steel Ground Reservoir561 110.00320m Steel Ground Reservoir(Installation/Labour) 184 800.00Construction of Pump Structure (Main Camp) 285 000.00Construction of Pump Structure (Ou Pos) 285 000.00Construction Fence (Razor Mesh) 156 800.00 Sub-Total 1 5111 800.00Add P & Gs (10% of Work Value) 511 180.00Sub-Total 2 5 622 980.00Add Contingencies (10% of Work Value) 562 298.00 Sub-Total 2 6185 278.00Add 15% Value Tax 927791.70Total Cost Estimate 7113069.70

COSTING OF PROPOSED UPGRADING (cont.)(b)Borehole Investigation: (N$)Borehole Investigation 450 000.00Borehole Testing 510 000.00Transport 7 425.00Analysis & Reporting (Estimated) 78 320.00Sub-Total 1 1 045 745.00Add P & Gs (10% Of Work Value) 104 574.50Sub-Total 2 1 150 319.50Add Contingencies (10%) 115 031.95Sub-Total 2 1 265 351.45Add 15% Value Tax 189 802.72Total Cost Estimate 1 455 154.17

COSTING OF PROPOSED UPGRADING(c)Consulting Fees (8 months): (N$)Primary Fee 181 320.00% Fee (7.5%) 533480.23Sub-Total 1 714800.23Estimated Disbursements 71480.02Subtotal 2 786280.2515% Value Added Tax (VAT) 117942.04Total Engineering Fee Estimate 904222.29

COSTING OF PROPOSED UPGRADING (cont.)(d)Construction Cost (Electrical): (N$)22kV/11kV supply point at main camp750 000.004km of 11kV cables to Ou Pos 2 000 000.0011kV/400V transformer500 000.00Standby Generators600 000.00Sub-Total 1 3 850 000.00Add P & Gs (10% Of Work Value) 385 000.00Contingencies (15% of Work Value) 57 750.00Total Engineering Fee Estimate 4 292 750.00

COSTING OF PROPOSED UPGRADING (cont.)(e)Consulting Fees (4 months): (N$)Primary Fee 50 440.00% Fee (7.0%) 300 692.46Sub-Total 1 351 132.46Disbursements 35 113.25Subtotal 2 386 245.7115% Value Added Tax (VAT) 57 936.86Total Engineering Fee Estimate 444 182.56(f)Estimated Total Cost: N$ 14209378.72 VAT and Consulting Fees

COSTING OF PROPOSED UPGRADING (cont.)OKATJIKONA EDUCATIONAL CENTRE:Construction Costs: (N$)Building works250000.00Duty / Standby Pumps150000.00New Pipework250000.00Sub-Total650000.0015% Value Added Tax (VAT) 97500.00Sub-Total (1)747500.00

COSTING OF PROPOSED UPGRADING (cont.)Consulting Fees (4 month Contract): (N$)Disbursements (travel etc.) 20000.00Fees212000.00Sub-Total232 000.0015% Value Added Tax (VAT) 34800.00Sub-Total (2) 266800.00

The total budget required for the upgrading of the existing water supply infrastructure at Okatjikona Educational Centre is N$ 1 014300.00 VAT and Fees included.

COSTING OF PROPOSED UPGRADING (cont.)recommendationsFrom the findings of the assessment study it is hereby recommend to upgrade the existing water supply at Waterberg Plateau Park for a total budget of N$ 15223 678.72 (Fifteen Million, Two Hundred and Twenty Three Thousand, Six Hundred and Seventy Eight Namibian Dollars and Seventy Two Cents).

RECOMMENDATIONS

QUESTIONS

Prepared by: Denchi Consulting Engineers (Pty) Ltd P.O. Box 80352 Windhoek, Namibia Tel: +264-61-228183 / Fax: +264-61-23 1703 / E-mail: [email protected]