WATER SUPPLY SYSTEM IN CHENNAI CITY UNDER JNNURM

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SUMMARY OF DETAILED PROJECT REPORT FOR IMPROVEMENTS TO WATER SUPPLY SYSTEM IN CHENNAI CITY UNDER JNNURM

 

INTRODUCTION :

Chennai Metropolitan Area :

Chennai city, is the capital of Tamil Nadu and fourth largest Metropolitan City in India.  The Chennai Metropolitan Area (CMA) comprises the city of Chennai and its outlying urban and rural areas.  The Chennai City Area now covers 176 sq.km.  The urban units grouped under the title "Adjacent Urban Area (AUA)" and "Distant Urban Area (DUA)" cover 164.6 sq.km. and 142.1 sq.km. respectively.

Earlier status of water supply :

Pipe borne water supply system was first provided in Chennai about 100 years back and has been expanded over time to satisfy the increasing demands for water since its inception. However during the last 20 to 30 years, water demand has increased drastically due to the natural growth of the Chennai City and substantial inward migration of people from rural areas. But, the supply of water has virtually remained constant and has increased at a very slow rate.

 

SOURCES

Surface Sources :

Water supplies for Chennai city were drawn from three interconnected off river impounding reservoirs at Poondi, Cholavaram & Redhills which collect and store flows from  Kortalayar, Nagari and Nandi rivers, plus runoff from direct catchments of the three reservoirs. These rivers usually floods for few days during the North East monsoon period between Oct Dec. The total capacities of the reservoirs are as follows.

Sl .No.

Reservoir

Capacity
(in Mcft)

1 Poondi

3231

2 Cholavaram

881

3 Red Hills

3300

Total

7412

Ground water sources :

The city gets its groundwater supply from two main sources :

  1. Well fields in the Araniyar-Koratalaiyar (A-K) Basin

  2. Southern Coastal Aquifer (between Thiruvanmiyur, Muttukadu along Mahabalipuram Road)

 

TREATMENT CAPACITIES

During early 1990 the raw water was received from Redhills Lake through gravity conduits to Kilpauk, treated in the water treatment plant at Kilpauk having a capacity of 270 mld. The treated water from the Kilpauk treatment plant was conveyed to the four Head works at Kilpauk, Anna Poonga, Southern Head Works and K.K. Nagar. Water supply for the entire Chennai city was made from these four Head Works through the transmission mains radiating from Kilpauk.

Subsequently during 1996, under First Chennai project another treatment plant of 300 MLD capacity was constructed at Red hills to Augment city supply. Under source augmentation CMWSSB has implemented Chennai Water Supply Augmentation Project-I for treatment and transmission of 180 Mld of Veeranam water. In addition to enhance the flow efficiency, the lining of Telugu Ganga Project canal are taken up to realise the full quantity of 12 TMC (930 mld) of water. Hence a treatment plant of 530 Mld capacity was constructed at Chemberambakkam. A project to construct a 100 mld Reverse Osmosis based sea water desalination plant under DBOOT basis has also been taken up for implementation. Hence the water availability will be increased in the coming years.

 

IMPROVEMENTS TO WATER SUPPLY SYSTEM

The implementation of the Master Plan for Water Supply and Sewerage drawn in the year 1978, revised in 1991 and updated in 1997 is being taken up by CMWSSB in stages, with funding from the World Bank, HUDCO, TUFIDCO and other financial institutions.  Originally the city water supply system was served by 4 head works and the Master Plan envisaged reorganizing the system with 16 zonal head works to provide equitable supply of water.

The works contemplated under First Chennai Project with the World Bank assistance were completed at a total final cost of Rs.150.80 crore in 1996 and works envisaged in Second Chennai Project with the World Bank assistance were completed at a total final cost of Rs.720.72 crore in March 2004.  Consequent to completion of the above works, the piped water supply availability has been increased with reduced defective streets and the service levels also improved in areas taken up for improvement under these projects.

Some of the components included in the Master plan could not be taken up as World Bank loan closure period was over in March 2004 as per the agreement with World Bank.  Hence the works such as improvement to the water Distribution station in the remaining 4 zones and to strengthening of the water distribution system in the remaining 5 zones and isolation of 16 zones, Rehabilitation and reconstruction of raw water conduit etc are proposed in the present proposal.

Therefore CMWSSB has now proposed to take up the foresaid components under the present proposal under 13 Packages to improve the Water Supply System of Chennai city so as to cover the water supply facilities of entire Chennai Metropolitan Area.

 

The following are the components of works envisaged in the present project proposal

(1) Water Distribution Stations :

Package I - Improvements to Water Distribution Station in Kilpauk :

Improvements to water distribution station at Kilpauk water supply zone including construction of underground tank of 35.85 million litre capacity, Over head reservoir of 9.0 ML capacity, pumphouse with 6 nos of pumpsets    (4 running + 2 stand by) with 1960 lps @ 32 m head/ 800 KW   HT (6.6 K.V) motors covering civil, mechanical, electrical and instrumentation works.

Package II - Improvements to Water Distribution Station  in Anna Poonga :

Improvements to water distribution station at Anna Poonga water supply zone including Over head reservoir of 2.80 ML capacity and construction of pumphouse with 6 nos of pumpsets (4 running + 2 stand by) with 550 lps @ 30 m head with 220 KW motors and overhead tank of 2.8 million litre capacity covering civil, mechanical, electrical and instrumentation works.

Package III - Improvements to Water Distribution Station in Southern Head Works :

Improvements to water distribution station at Southern Head works water supply zone covering mechanical, electrical and instrumentation works.

Package - IV - Improvements to Water Distribution Station in K.K. Nagar :

Construction of water distribution station at K.K.Nagar water supply zone including underground tank of 14 million litres capacity, Over head reservoir of 2.40 ML capacity, pumphouse,6 nos of pumpsets (4 running + 2 stand by)  with 590 lps @ 30 m head 250 KW motors and overhead tank  covering civil, mechanical, electrical and instrumentation works.

(2) Water Distribution Systems :

Package - V - Strengthening of Water supply Distribution system in Kilpauk Zone :

The work of strengthening the distribution network in Kilpauk zone involves retaining the existing CI pipes in some reaches, laying additional lines in parallel for strengthening in some reaches and laying fresh lines of adequate sizes in streets without water main. The length of water main proposed to be strengthened for 167 km.

Package - VI - Strengthening of Water supply Distribution system in Anna Poonga Zone :

The work of strengthening the distribution network in Anna Poonga zone involves retaining the existing CI pipes in some reaches, laying additional lines in parallel for strengthening in some reaches and laying fresh lines of adequate sizes in streets without water main. The length of water main proposed to be strengthened for is 30 km.

Package - VII - Strengthening of Water supply Distribution system in Southern Head Works Zone :

The work of strengthening the distribution network in Southern Headworks zone involves retaining the existing CI pipes in some reaches, laying additional lines in parallel for strengthening in some reaches and laying fresh lines of adequate sizes in streets without water main. The length of water main proposed to be strengthened for 24 km.

Package VIII Strengthening of Water supply Distribution system in KK Nagar Zone :

The work of strengthening the distribution network in K.K.Nagar zone involves retaining the existing CI pipes in some reaches, laying additional lines in parallel for strengthening in some reaches and laying fresh lines of adequate sizes in streets without water main. The length of water main proposed to be strengthened for 61 km.

Package IX Strengthening of Water supply Distribution system in Triplicane Zone :

The work of strengthening the distribution network in Triplicane zone involves retaining the existing CI pipes in some reaches, laying additional lines in parallel for strengthening in some reaches and laying fresh lines of adequate sizes in streets without water main. The length of water main proposed to be strengthened for24 km.

Package - X - Providing valves in all the 16 zones towards isolation of zones.

There are 15460 nos. of streets in Chennai City covering a length of 2581.95 Kms.  Water supply for the entire population of the city is covered with piped/tank water supply from the 16 water supply zones. All the 16 water distribution systems have to be isolated by providing the sluice valves of various sizes ranging from 100mm to 900mm at the boundaries of each zone in feeder and distribution mains so that the entire service area would be benefited in supply eliminating defective streets of piped water supply.

Package - XI - Leak Detection and Rectification programme under Phase VI

The main objectives of the assignment is assessing the level of leakage in the distribution system both in mains and at house service lines extended from the mains and to rectify by implementing the following measures.

  1. MDPE pipe materials of different sizes will be used for replacement of all house service connections

  2. 100/150/200 mm dia DI pipes for replacing at the Injection/Isolation points.

  3. Tentative provision of replacement of CI pipes with DI pipes for 50 KM and renewal of HSC for 42,000 Nos. in package VI.  Only CI pipes found fully corroded and having served its life will be considered for renewal.

  4. Leak noticed during pressurization will be attended and rectified.

Package - XII - Proposal for extending basic amenities in the unserved and unsewered areas

There are 15460 nos. of streets in Chennai City covering a length of 2581.95 Kms.  Out of which   732 nos. of Streets covering 94.78 Kms. Water supply lines and 270 nos. of streets covering 48 Kms. Sewer mains are to be provided.Hence, a detailed proposal has been prepared for providing water supply & sewerage amenities to these unserved streets.

Package - XIII - Reconstruction of Raw water transfer Conduits I & III and repairs and rehabilitation of conduit II from Red Hills to Kilpauk Water Treatment Plant

There are three existing masonry conduits, which are used to draw raw water from Redhills -were construced in the years 1914, 1955 and 1986.  Since the conduits are damaged and badly leaking, it has been proposed to reconstruct the Conduits I and III and carry out repairs and rehabilitate the Conduit-II to transfer 359 MLD of water to Kilpauk Water Treatment Plant   The proposals envisage Construction of 1300mm x 1300mm RCC conduit within the existing Conduit-I and onstruction of 1700 mm x 1400 mm RCC conduit within the existing conduit in Conduit-III. 

 

PROJECT COST

The above project proposals for improvements to water supply system in Chennai city was appraised before the JNNURM committee under Ministry of Urban Development, Government of India on 24.11.06 and the committee has approved the proposals for Rs 322.00 Crores.

The following are the cost of various components of works envisaged in the present proposal

Sl. No.

Description

Approved Cost under JNNURM (Rs.in Crore)

Revised Estimate cost
(Rs.in Crore)

1.

Improvements to Water Distribution Station in Kilpauk

44.63

49.71

2.

Improvements to Water Distribution Station in Anna Poonga

10.73

11.00

3.

Improvements to Water Distribution Station in Southern Headworks

1.63

1.65

4.

Improvements to Water Distribution Station in K.K. Nagar

22.48

23.80

5.

Strengthening of water distribution system in Kilpauk zone

73.86

76.72

6.

Strengthening of water distribution system in Anna Poonga zone

11.24

11.33

7.

Strengthening of water distribution system in Southern H. W. zone

8.75

8.77

8.

Strengthening of water distribution system in  K.K. Nagar zone

21.66

22.02

9.

Strengthening of water distribution system in Triplicane zone

11.27

12.56

10.

Providing valves in all 16 zones towards isolation of zones

15.12

15.62

11.

Leak Detection and Rectification programme in Phase-VI

28.54

30.12

12.

Proposals for extending basic amenities to benefit urban poor population

21.34

21.34

13.

Reconstruction of raw water transfer conduits I & III and repairs and rehabilitation of conduit II from Redhills to Kilpauk WTP

41.38

43.01

 

TOTAL

312.63

327.65

 

Physical Contingencies @ 3%

9.37

9.83

 

TOTAL ESTIMATE COST

322.00

337.48

 

PROJECT IMPLEMENTATION ARRANGEMENTS

The project will be implemented by the CMWSSB. Since its formation the Board has implemented various improvement works. A Chief Engineer supported by a dedicated team of Engineers in the cadre of Superintending engineers, Executive Engineers etc.

 

IMPLEMENTATION PLAN

Out of the above 13 Packages, the works have been taken up and four packages are completed. (Package 1,2,3 & 12)  The works are  in progress in 8 Packages. In view of high value of bids, the contract for the balance one package viz., Reconstruction of raw water transfer conduits I & III and repairs and rehabilitation of conduit II from Red hills to Kilpauk WTP  has been cancelled and proposals are under revision

 

   
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