planning and design of sewers using advanced techniques for proposed sewerage system of district-...
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CONSULTING ENGINEERS LIMITED
PLANNING AND DESIGN OF SEWERS USING ADVANCED TECHNIQUES FOR PROPOSED SEWERAGE SYSTEM OF DISTRICT- I FOR KANPUR CITY UNDER NGRBA PROJECT
12 Dec. 2014
International Conference on Sustainable Clean Ganga Mission: Opportunities &
Challenges
BySanjay L. Lalan, J. K. Singh, A. S. Gupte
Ministry for Water Resources, River Development and Ganga Rejuvenation
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INTRODUCTION
• National Ganga River Basin Authority (NGRBA) has taken up projects for “Mission Clean Ganga” under which no untreated municipal sewage or industrial effluent would be allowed to be discharged into the river Ganga by the year 2020.
• NGRBA Objective - to provide integrated sewerage system for collection of sewage and providing STP for treatment before discharging sewage into River Ganga and preventing pollution of river Ganges and for sustainable development of surrounding areas.
• NGRBA has taken up sewerage project initially in Allahabad & Kanpur cities.
• Tata Consulting Engineers Ltd. was awarded Consultancy Services for “Technical Review, Financial Analysis and Preparation of Bid Documents of projects under NGRBA for Kanpur District- I & Allahabad District- A and District- C sewerage system” in November 2011.
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PROJECT DETAILS
Sub Project Area – (TCE prepared DPRs/Tenders)
11 wards of District-I in Kanpur
Sewerage District –C in Allahabad (including STP)
TCE provided handholding services, day to day interaction and technical support at Kanpur and Allahabad to UPJN for DPR /Tenders-
Balance 23 wards of District-I in Kanpur
Sewerage District -A in Allahabad
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PROJECT DETAILS
Kanpur is the biggest city of the State of Uttar Pradesh and is main centre of commercial and industrial activities.
Kanpur city population - 29.42 lakhs (2011).
It is administratively divided into 6 zones and 110 wards.
As per Master Plan report, Kanpur city is divided into four sewerage districts from I to IV.
In District-I, about 70% area is sewered and remaining 30% is un-sewered. Area is 33.20 km2 and has 34 wards.
In unsewered area, local residents have own arrangement with septic tanks and the effluent is discharged into nearby drains/nala which finally discharged into river Ganga.
District-I have 25 wards in old city (inner old area) and 9 wards in north-east area and is situated on right bank of river Ganga which is mainly residential area & famous for commercial centre and reputed institutes.
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KANPUR SEWERAGE MAP
KEY MAP OF SEWERAGE DISTRICTS IN KANPUR
DIST-II
DIST-I
DIST-III
DIST-IV
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POPULATION AND FLOWS
DescriptionSewerage District – I, 11 wards
– Sub Project AreaPopulation(2011)
2.36 lacs
Design population (2050) 3.06 lacsDesign Flows 40.39 MLDArea covered 397 hectare
Sewerage District
Census Population
(2011)
Projected Population
(2020)
Projected Population
(2050)
Sewage Flows 2020
(MLD)
Sewage Flows 2050
(MLD)
I 9,04,280 12,11,850 21,65,601 159.96 285.86
Kanpur City:
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PROJECT LOCATION – SUB PROJECT AREA
SEWER NETWORK IN PROJECT AREA, KANPUR (DISTRICT- I)
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CONTOUR LEVELS OF SUB PROJECT AREA
Terrain Variation of 11 Wards in Sub Project Area, Kanpur
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PROJECT DETAILS – SUB PROJECT AREA
11 wards of District –I are having narrow streets and busy and
congested area.
106km of existing sewers. Most of the existing sewers are RCC Pipes.
Large sized sewers are of Brick Masonry egg shaped sewer.
Sewage from 11 wards is proposed to be connected to trunk sewers
located along the Mall Road (Parade-Bada chauraha-Phool Bagh road)
and leading to Jajmau STP.
Old trunk sewer (1000 mm dia) and another new trunk sewer (1000mm-
1200mm-1400mm dia) along Mall Road.
Due to already defined invert levels of existing trunk sewers, the efforts
made for connecting sewers of 11 wards by gravity to existing trunk
sewers.
Sewer network was optimized using software with minimum pumping
station and avoiding deep excavation. Hydraulic design of sewers is
done using SewerCAD software.
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PROJECT DETAILS
Sewage Pumping Station has been proposed near Chacha Nehru
Hospital to avoid the deep sewer excavations in downstream area.
There is a local depression in Patkapur area, where ground levels
are in the range of 119.75 to 122.00m compared to surrounding
ground levels of 124.00m. Lift Station is proposed to pump sewage
to nearby outfall.
For utilisation of existing sewers in project area, extensive survey
and data collection was carried out in the field to assess the
condition of sewers.
Interacted with ULBs for required information such as sewer
collapse, choking, overflow, etc. and verified existing alignment at
site and its connectivity.
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SURVEY OF EXISTING SEWERS
Physical survey was done for obtaining details of existing sewers. The sewer
condition (including manholes) were observed physically by opening
manholes.
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PROJECT HIGHLIGHTS
Existing sewers which were in good condition and laid within past
15-20 years, are utilized in overall planning and designing for next
30 years horizon. Silted sewers which are in good condition are proposed to be
used after desilting. Heavily silted sewers are being discarded. Sewers of 400mm dia. and above sizes are proposed for internal
lining by rehabilitation techniques. GRP slip lining for egg-shaped sewers Polyurea coating for circular sewers
Trenchless technology for laying of new sewers in busy road
crossings and speedy execution At narrow streets, the use of HDPE pipes and pre-cast RCC
manholes is proposed to speed up the work.
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LINING OF EXISTING SEWERS AND PIPE JACKING
A – Existing sewers after desilting
B - Installing Liner
C - Rehabilitated Sewer after grouting
D – Cross section of Rehabilitated Sewer
LAYING OF PIPE USING TRENCHLESS TECHNOLOGY
ALIGNMENT CHECKING WITH LASER
PIPE JACKING
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PROJECT HIGHLIGHTS
During execution stage, Contractor shall first have to carry out
detailed condition assessment survey for sewers and obtain
concurrence regarding their utilization from the Department.
Egg-shaped brick sewers are proposed to be rehabilitated with
GRP segment pipes. For this, the Contractor will require to carry
out CCTV survey, submit the assessment report and provide GRP
segment lining for identified stretches.
Similarly, for circular sewers the Contractor will require to carry
out CCTV Survey, submit the assessment report and provide
polyurea coating for identified stretches.
Wherever, existing sewers are to be replaced by new sewers, the
existing system will continue to operate by sequential
construction program and temporary pumping so as to minimize
the inconvenience to users.
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MULTIPLE HOUSE CONNECTIONS WITH SINGLE ROAD-SIDE CHAMBER
DESILTING, PRECAST MANHOLES AND MULTIPLE HOUSE CONNECTIONS
PRE CAST CONCRETE MANHOLE
METHODOLOGY FOR DESILTING
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PROPOSED SYSTEM
Description Kanpur City (Sewerage District – I, 11 wards)Design Year 2050Design population 3.06 lacsArea covered 397 hectareSewer Network – Proposed
Length - 62 km (RCC NP3 / HDPE PE-100 PN 6.0)Sizes – 150 to 700mm dia.
Sewage Pumping Station – Proposed
- One SPS (peak flow capacity: 9.26 MLD) - One Lift Station (peak flow capacity: 2.14 MLD)
Rehabilitation of existing sewers
- De-silting of existing sewers- 17 km (sizes– 150 to 200mm dia.)
- Rehabilitation of existing circular and egg shaped sewers- 3 km
Circular sewers sizes– 400 to 900mm dia. Egg shaped sewers sizes – 18’’ x 27’’ / 20’’ x 30’’
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PROJECT HIGHLIGHTS
Prequalification and Tender documents are prepared as the World
Bank guidelines.
Prepared project level procurement plan and detailed capital cost for
the project.
Undertaken detailed financial viability analysis.
Prepared financial models for service provider in Allahabad and
Kanpur for sub project area and also a Framework for Financial
Modeling which can be applied in later stages of the project.
Project Economic analysis which included computation of Internal
Rate of Return and economic benefits by establishing baseline
terms of the amount of pollution in the river and characteristics of
the effluents.
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PROJECT BENEFITS
With proposed sewerage system, Prevention of Pollution of River Ganga. Public inconvenience and traffic interruption will be minimized. Resource conservation by reducing the requirement for
procurement of new pipes. Construction time will be reduced by around 6 months by
avoiding major pipe trench excavation & laying work and
procurement of new pipes. Better environment and hygienic condition. Uplift the social standards of residents and human dignity. Avoiding the chances of damage to foundation of nearby
structure.
UPJN Kanpur DPR for remaining 23 wards (of length about
400km) is prepared on similar approach.
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PROJECT COST
Sl. No.
Components Project Cost (Rs. In Crores)
1 Sewerage System in 11 wards of District-I in
Kanpur
75.01
2 Sewerage System in Balance 23 wards of
District-I in Kanpur
397.31
3 Sewerage system in District –C in Allahabad 147.67
4 Sewerage system in District –A in Allahabad 288.94
5 14 MLD STP in District –C in Allahabad 42.24
Total Project Cost 951.17
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CURRENT STATUS OF PROJECT
The project has been approved by NGRBA in
Empowered Steering Committee meeting in 2014 for
implementation.
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