DELAY ANALYSIS OF RAW WATER RESERVOIR AND PUMPING STATION By Ch. Bala Krishna Assistant Professor Department of Civil Engineering
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DELAY ANALYSIS OF RAW WATER RESERVOIR AND PUMPING STATION
ByCh. Bala Krishna
Assistant Professor
Department of Civil Engineering
Outline of the Presentation
• Introduction
• Need of the Study
• Objectives of the Study
• Literature Review
• Methodology
• Case Study Descriptions
• Results and Discussions
• Summary and Conclusions
Introduction
Introduction
• Delay means a time overrun either beyond the contract date or
beyond the date that the parties have agreed upon for the delivery of
the project.
• Delay is an interruption in the planned sequence or flow of work. It
can occur during the work or it can effect the over all project, so
completion of project may be extended.
• Delay Analysis is used to find the delays and its effects on the
project schedule and factors affecting the project.
Need of the Study
• This study concentrates on the work sequence, planning and
scheduling of the project.
• This study helps to identify the critical paths of the Reservoir and
pumping station construction work sequence.
• This study dwells on the importance of construction schedules in
achieving the aim of producing good quality construction work within
the specified time.
• This study also helps the project manager and concerned professionals
to produce good planning and scheduling for the project.
Objectives of the Study
To understand and identify the major types of construction
delays and causes in the construction project.
To estimate the amount of resources involved in the project,
during planning and construction stage.
To make a realistic and achievable schedule using Primavera.
To measure the impacts of construction delays of schedule
project.
Literature Review
• Trying to anticipate what will happen and devising ways of
achieving the set of objectives and targets”.
• The process of selecting one method and order of work to be
used on a project among all the various methods and
sequences in which it could be done.
• The process of determining the actual time periods during
which the activities are planned to take place.
• Scheduling is used for measuring delay and time extensions.
• Delay is an event that causes extended time to complete all or
part of the project
Parties Responsible for Delay
Owner
Contractor
Sub-contractor
Suppliers
Labor Unions
Nature
Most Common Causes
Differing site conditions
Change in requirements or design
Inclement weather
Shortage of labor, material and equipment
Defective plans or specifications
Construction Delay Types
Excusable Delay:
o Compensable Delay
o Non - Compensable Delay
Non Excusable Delay
Non Excusable Delays• Contractor problem result in schedule impacts.
• Contractor not entitled to either time extension or
compensation.
• Examples:
• Late submittals
• Late material delivery
• Insufficient manpower
Conti…
• Contractor gets NO additional TIME
• Contractor gets NO additional MONEY
Excusable But Non Compensable
• Delay event:
Not controlled by the contractor
Not controlled by the owner
• Depends on contract, but typically
Acts of God
Union strikes
Local disputes
• Granted additional TIME
• NO additional MONEY
Owner Caused Delay:
• Defective designs
• Slow return of shop drawings
• Change order
• Defective supplied equipments
Conti…
Critical and Non Critical Delays
• Delays that result in extended project completion are
known as “Critical delays” and
• Delay that do not extend the project completion date are
known as Non Critical delays.
Methodology
• Initiation
• Planning
• Execution
• Monitoring / Controlling
• Closing
Project Planning Management
Advantages:
Central database, Primavera P6 enables project managers to
access project data any where and at any time.
This single data base increases
• Efficiency
• Consistency and repeatability
• Saving organization’s time and money
CASE STUDY
Project Attributes
Project Data:
• The project “Raw Water Reservoir and Pumping Station” is
located at Bomakkal village in Karimnagar (District).
• This project is constructed under Godavari Drinking Water
Supply Project Phase-1 and named as Maulana Abdul Kalam
Hyderabad Srujala Sravanthi Scheme.
Study Area
Name of the project : Raw Water Reservoir and Pumping
station
Name of the company : Nagarjunga construction company
Built up Area : 18420.86 Sqm
Total project duration : 24 Months
Total project cost : 15.84 Crores
• Hyderabad Metropolitan Water Supply and Sewerage Board and
AP Transco officials are involved in their respective works. The
drinking water project aims to bring 172 Million Gallons per
day (MGD) from Yellampally barrage in karimnagar (District).
• The scheme envisaged to bring 10 TMC of water from river
Godavari to Hyderabad city. The total project cost Rs. 3375
Crores is estimated.
Project Schedule
• The total project duration was 713 days. The actual planned
schedule contains all types of activities with different duration
based upon the nature of work.
• The actual planned schedule also contains work breakdown
structure where the activities are categorized under their
specific work and explains the resources, roles assigned to the
activities.
Updated Proposed Schedule
• The updated proposed schedule was 683 days. The updated
proposed schedule is prepared by an general survey regarding
the duration of the project.
• The survey is conducted to find out whether the planned
schedule can be decreased by adding more resources.
Duration Analysis
• The duration analysis is to compare the actual planned
schedule duration and updated proposed schedule duration.
• The duration of the activities are taken into account to show
the difference between the two schedules.
• The duration of the activities are compared to find out the
delays in both schedules.
Results and Discussions
Activity wise Delay Analysis
Earthwork
Excav
tion Reservo
ir
Foundati
on
Raft Fo
oting
Retaining w
all Belo
w GL
Columns and Grad
e Slab
Retaining w
all Above
GL
Beams a
nd Roof Slab
Launder
Wall
Mechan
ical W
ork
Archite
ctural
Work
Electr
ical Fi
ttings
Earthwork
Excav
tion Pumping Stati
on
Foundati
on
Raft Fo
oting
Columns
Beams a
nd Ground Le
vel Sla
b
Retaining W
alls
Columns Above
Ground Le
vel Sl
ab
Beams a
nd Roof Slab
Mechan
ical W
ork
Archite
ctural
Work
Electr
ical Fi
ttings0
20406080
100120140160180
Raw water Reservoir and Pumping Station
Del
ay(d
ays)
Activities
Earthwork
Excav
tion Reservo
ir
Foundati
on
Raft Fo
oting
Retaining w
all Belo
w GL
Columns and Grad
e Slab
Retaining w
all Above
GL
Beams a
nd Roof Slab
Launder
Wall
Mechan
ical W
ork
Archite
ctural
Work
Electr
ical Fi
ttings
Earthwork
Excav
tion Pumping Stati
on
Foundati
on
Raft Fo
oting
Columns
Beams a
nd Ground Le
vel Sla
b
Retaining W
alls
Columns Above
Ground Le
vel Sl
ab
Beams a
nd Roof Slab
Mechan
ical W
ork
Archite
ctural
Work
Electr
ical Fi
ttings0
20
40
60
80
100
120
140
160
Raw water Reservoir and Pumping Station
Del
ay(d
ays)
Activities
Conti..
• After comparing both the durations of activities, the updated
proposed schedule is reduced by 30 days.
• The schedule duration is decreased by assigning more resources
(manpower, equipments).
Conti..
Resource Analysis
• The resource analysis is to compare the resources used in
actual planned schedule and updated proposed schedule. The
resources assigned for actual planned schedule takes the
project to complete in 713 days.
• The updated proposed schedule takes 683 days to complete the
project. By assigning more resources the duration is decreased
by 30 days.
Actual Schedule Versus Proposed Schedule
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 260
5
10
15
20
25
30
35
Actual ScheduleProposed scheduleSc
hedu
le
Resources
Determination of Causes and Types of Delays
• In this case study project, there are total of 20 delay events
including both critical and non-critical delays. Critical 11of
them are occurred as critical activities while 9 occurred as
non-critical activities.
Delay Activities
No Delay Description Impacted Activity
Name
Impacted Activity
Code
1 Delay occurred due to unforeseeable
weather conditions
Earthwork excavation P 1040
2 Delay in supply of steel for Raft
Footings occurred due to transportation
Raft Footing/
Reinforcement
P 1110
3 Delay in Reinforcement of Retaining
walls occurred due to corrections in
drawing
Retaining walls P 1170
4 Delay in backfilling compaction for
Retaining walls due to failure of
equipment
Backfilling
compaction
P 1240
5 Delay in cut and bend of steel in
Columns and Grade slab
Reinforcement
Columns & Grade slab P 1250
6 Delay in formwork for Columns &
Grade slab
Columns & Grade slab P 1270
7 Delay in Earthwork Excavation
occurred due to predecessor activity
Excavation P 1770
8 Delay in compaction of CNS soils
occurred due to unforeseeable
whether conditions
CNS soil compaction P 1800
Conti..
9 Delay in PCC compaction occurred due
to equipment failure
PCC compaction P 1820
10 Delay in marking for Raft Footings
occurred due to corrections in drawings
Raft Footings marking P 1830
11 Delay in supply of steel for Raft
Footings occurred due to transportation
Raft Footing
Reinforcement
P 1840
Conti..
Types of Delays
Impacted Activity Earthwork Excavation
Start 01-04-2013
Finish 10-06-2013
Duration 61 days
Delay type Excusable delay
Delay description Delay occurred due to unforeseeable whether
conditions
Impacted Activity Raft Footing Reinforcement
Start 28-06-2013
Finish 09-07-2013
Duration 10 days
Delay type Non-Excusable delay
Delay description Delay in supply due to transportation
Conti..
Impacted Activity Raft Footing Marking
Start 26-08-2013
Finish 11-09-2013
Duration 18 days
Delay type Non-Excusable
Delay description Delay in marking for Raft Footing occurred due
to corrections in drawings
Conti..
Impacted Activity Raft Footing Reinforcement
Start 26-09-2013
Finish 11-10-2013
Duration 26 days
Delay type Non-Excusable
Delay description Delay in supply occurred due to transportation
Conti..
Summary and conclusions
Conclusion • It is observed from delay analysis that, the total 20 parameters
were identified and analyzed.
• From these 20 parameters, 11 parameters are the sensitive
parameters that effect the overall duration of the construction
project.
• It is observed that the updated proposed schedule decreased, by
increasing the resources and the cost of the project increased.
• After the updated proposed schedule, the complete project was
reduced by 30 days.
Thank you
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