Sorry, you need to enable JavaScript to visit this website.
Wednesday , 21st August 2019
Section: Major Water Supply Schemes pages are not under access control

Improvement of Water Supply Distribution System to Vellore Corporation in Vellore District Under Amrut Programme.

Quantity : Int -102.673 MLD, Ult -133.363 MLD
Cost of Installation : Rs.234.93 Crores
A.M Cost : Rs.0.505 Crores

WSIS to Vellore corporation in Vellore District was administratively sanctioned vide G.O. Ms. No. 109/ MAWS ( MA2)/ Dated: 29.08.2016 for Rs. 234.93 Crores under AMRUT Programme with funding pattern of Government of India 50% Government of Tamil Nadu share 20% and Urban Local Body contribution of 30%.

 Prefatory :

Vellore Corporation was upgraded to City Municipal Corporation with effect from 01-08-2008. Vellore City Municipal Corporation covers the erstwhile Vellore Municipality and two Municipalities i.e. Sathuvacheri and Dharapadaveedu, six Town Panchayats namely Katpadi, Gandhi Nagar, Allapuram, Thorapadi, Shenbakkam, Kalinjur and nine Village Panchayats viz Alamelumangapuram, Viruthampattu, Kangeyanallur, Virupatchipuram, Palavanchathu, Edyanchathu, Ariyur, Chitteri and Konavattam. Vellore City Municipal Corporation area spreads over an extent of 87.915 sq.km with a population of 5.04 lakhs as per census 2011.

The Corporation has 60 wards which are divided into four administrative zones of 15 wards each. The Zones are Dharapadavedu, Sathuvachari, Vellore and Shenbakkam. The total length of the roads within Vellore City Municipal Corporation is 649.69 km as per Corporation records. The Vellore City Municipal Corporation area is divided into 60 wards.

Vellore Corporation is located in the 12 55 N latitude and 79 08 E longitude, on the banks of the river Palar, about 135 km north west of Chennai and 180 Km from Bangalore. The N.H.46 from Ranipet to Krishnagiri (forming part of Madras and Bangalore corridor) and the National Highway No.234 & 78 (Mangalore and Villupuram) cut across the Corporation. The Villupuram and Tirupathy broad gauge railway line passes through the town with Vellore Cantonment and Vellore town railway stations located within the Corporation area. One of the major B.G .railway corridors in the country, Chennai and Bangalore /Coimbatore/Ernakulum runs about 5 km north of this Corporation with Katpadi being the feeder railway junction.

 

Existing Water Supply Arrangements:

The water supply distribution network now functioning in Vellore Old Municipal areas are dead old say more than 100 years old. It is found great difficult to maintain water supply in this existing network system, because of various factors involved such as old and worn out pipes notable to withstand the distribution, insufficient sizes and Multi distribution lines in some areas etc.

Vellore Corporation meets its water supply requirements through sub-surface sources. The sub-surfaces sources are the bore well/open well at the Otteri lake, Palar river bed, Karugampathur head works and Ponnai river Head works. There are the Sources the Vellore City Municipal Corporation is dependent for drinking water supply, as the town does not have perennial water course. However the Palar River passes within boundary of town but it is almost dry throughout the year. Only at the time of normal and adequate rainfall, the river sees a thin water flow. During the years 2005 2015 and 2017 has given somewhat adequate rain in the town and its vicinity areas.

Source and Headworks

The source of the water supply is collectively from various Headworks and multiple infiltration Wells and some local Borewell Sources as given below:

 

(a) Otteri Lake:

This is the oldest scheme commissioned during 1907and has its source at Otteri Lake. The water from this source is drawn to two ground level reservoirs (GLR) located at filter bed road from where it is distributed to the town. This scheme has served its life period and on average of only 0.6 MLD water is available in the Otteri lake.

(b) Palar Headworks:

This scheme was commissioned during 1934, with headworks at Palar River near old bridge leading to Katpadi. This scheme consists of one 4m diameter suction well and 5 infiltration galleries of 90m length. The Palar headwork has also served its life period of more than of 50years. Only an average of 4.0 MLD is available from this source, during peak summer. The rainfall in Vellore and its vicinity areas has vastly improved the sub-surface water in the recent 2015 & 2017 rainfall. Thus, today 4.5 to 5.0 MLD is extracted and supplied to the town with existing refurbished pumping machinery.

(c) Karugamputhur Headworks:

This was the third scheme and commissioned in 1982 again with Palar as source but at a different source point i.e., near Karugamputhur village. This headwork is situated at about 5kms from Vellore town. This scheme has been designed for a population of about 2 lakhs by 1996 as an intermediate stage and 2.50 lakhs by 2011 for ultimate stage. The scheme was meant not only for Vellore town but also for Allapuram and Government institutions like polytechnic, central jail etc. It was proposed to draw 23.04MLD in the intermediate stage and 28.25MLD for ultimate stage. The scheme consists of a collector well with 8 radial arms. Due to depletion of water level in river Palar during summer months 2 infiltration wells have been added in addition to existing 8 bore wells. Now a minimum of 2.5 MLD is realized from this source during peak summer and an average of 5.0 MLD is realized on an average.

(d) Sathuvacheri Town Panchayat:

All the above 3 sources of water were found to be very much in sufficient for Vellore town and hence about 10 LLD of water was drawn from Sathuvacheri Town Panchayat water supply scheme till 2004. This water was being pumped directly from Sathuvacheri headworks to the elevated reservoir (capacity 10 lakh litres) located at Saidapet. This catered to the needs of people at Saidapet, Kakithapattarai and Thotapalayam areas. However the first three sources, namely Otteri lake. Palar head works, Karugamputhur headworks have been recharged with water during the rains of 2015 and they continue yield in somewhat improved state. Due to the availability of water, Sathurachari water in not availed by the town and instead a new source again at the Palar river namely Ponnai source supplies 8.40 MLD from 2004.

(e) CWSS with river Cauvery as source:

In view of the above situation the Government of Tamil Nadu decided to take up in 2008 the possibility of a comprehensive water supply to Vellore Corporation and other local bodies in Vellore District with River Cauvery as source to be tapped from Mettur Dam as a permanent solution. Accordingly, a proposal was prepared For Rs.1295 Crores, for sanction accorded vide G.O.Ms.No.319 (WS1) MA&WS Dept. Dated.31.12.2010. The proposal envisages 135 lpcd to Vellore Corporation by providing 59 MLD up to the Intermediate year of 2026 and 77 MLD up to the Ultimate year of 2041.

The proposal was to tap the project ultimate requirement by providing off-take well arrangements in River Cauvery near Thottilpatti Village, downstream of Mettur Dam & upstream of Chekkanur Barrage. Collected raw water will be pumped (23hours) to the treatment plant of 181 mld capacity, located at Thottilpatti Village at Headworks site owned by TWAD Board (10.50acres). Treated water will be pumped for a total length of 80.70km, through relay pumping through 3 Booster stations viz Komburankadu, Palakkanur & Muthampatti to a Master Balancing GLSR (MBGLSR) at Kadathur Ridge point. From the MBGLSR, water will be gravitated for a total length of 228km, to the beneficiaries’ up to Arakkonam, through sumps for urban beneficiaries & group sumps for rural habitations. Water is being distributed to the beneficiaries by utilizing existing & proposed infrastructures from 2014 onwards.

Details of Sumps constructed by TWAD board as part of Cauvery Combined Water Supply Scheme is as follows:

S.No Location of Sumps Capacity (in LL)
1 Ariyur 0.55
2 Alamelumangalapuram 0.70
3 Konavattam 0.90
4 Palavansathu 1.55
5 Edayansathu 0.45
6 Virupatchipuram 1.20
7 Chitheri 0.30
8 Dharavapedu 12.60
9 Kalinjur 6.00
10 Katpadi 4.75
11 Thorapadi 2.00
12 Gandhi Nagar 3.20
13 Muthumandapam (2 Nos.) 28.50
14 Allapuram 33.50
15 Virudhampattu 9.15
16 Virudhampattu 0.55
17 Kangeyanallur 1.25
18 Shenmbakkam 5.05
19 Vinayagapuram 2.55
20 Sathuvachari 16.60
    131.35

Necessity of the Scheme

The Vellore Corporation intends to improve its water supply distribution network, in order to ensure daily availability of protected water supply to all. Further the existing distribution network is having uneven water supply to users particularly on tail ends. There are certain areas where water supply is more than adequate in the system. Further the Corporation is fed with inequitable supply of water and poor demand coverage. Hence it is necessary to improvise the existing water supply system and also develop a water Supply Improvement Scheme for the distribution network and to improve the existing water supply in the corporation area to achieve equi-distribution of water supply to all areas.

In order to maintain full pledged water supply distribution system without break, it has been decided to examine and inspect almost all the distribution mains with the help of modern equipment’s and invite TWIC to provide consultancy.

The scope of the work includes water supply Transmission main / Feeder main and distribution system networks improvements by way of improvements to the existing water supply Transmission main / Feeder mains and distribution system network covering the mainly the need for adequate sizing of transmission main / feeder main, extending to new reservoirs, proper reservoir management, evaluation of additional storage, evaluation of the existing pipes and replacement of pipes, expansion of water supply distribution network to the uncovered areas so as to achieve equitable and daily supply of water to the consumers.

Population And Demand

The water demand for entire corporation area were now assessed based on the following norms as given in CPHEEO Manual:

Base water demand -135 lpcd
Fire demand -100 (P/1000)^0.5
Distribution losses - 10%
Transmission Losses - 1%
Water Treatment losses - 3%

The projected water demand is given below:

Details of Water Demand for the Design Period

S.No. Description Units WATER DEMAND
   Period Year 2011 2016 2031 2046
1 2011 Census population   504079      
2 2016 -Projected Population     549349    
3 2031- Projected Population       719957  
4 2046 -Projected Population         920000
5 Water demand @ 135 LPCD MLD 68.05 74.16 97.19 124.20
6 Fire demand MLD 2.25 2.34 2.68 3.03
7 Industrial Demand MLD 0.00 0.00 0.00 0.00
  Total Demand MLD 70.30 76.51 99.88 127.23
8 CWSS Source till Consumer Point MLD 0 59.00 77.00 77.00
9 Demand to be met by Local Sources MLD 70.30 17.51 22.88 50.23
10 Losses in distribution @10% MLD 7.03 1.751 2.288 5.023
11     77.33 19.261 25.168 55.253
12 Losses in Transmission @1% MLD 0.77 0.192 0.251 0.552
13     78.10 19.453 25.419 55.805
14 Losses in raw water main @ 1% MLD 0.78 0.194 0.254 0.558
15 Local Raw water requirement (Including Losses) MLD 78.88 19.647 25.673 56.363
  Total Water Requirement MLD 78.88 78.647 102.673 133.363

Details of Water Supply Source and Demand gap in table here below:

S.No Year/Stage Projected Population Water Demand at 135 lpcd(Mld) Available Source (Existing + Proposed)(Mld) Deficit (Mld)
1 2016 (Base) 5,49,349 78.647 86.43(27.43+59.00) +7.783
2 2031 (Intermediate) 7,19,957 102.673 104.43(27.43+77.00) +1.757
3 2046 (Ultimate) 9,20,000 133.363 104.43(27.43+77.00) -28.933

Presently there isn’t any Gap up to the Intermediate year 2031. Hence Augmentation scheme for 2046 shall be done later.

Detail Description of Proposal

(1) Proposed Feeder Main:

Based the projected population for 2047 in Vellore region the Water demand has increased significantly compared to demand considered in Mettur Cauvery -Vellore CWSS.

Hence the diameter of the feeder mains under construction in the ongoing scheme shall be up sized to cater the increased demand. The system has been designed as per CPHEEO standard for the velocity criteria and the required pressure at all reservoirs. The Summary of the Results is as follows:

The proposed system requires a total of 78.848 Km of Feeder main to cater all the 67 Nos. of zones. Out of which,32.146 Km of existing mains will be utilized, and 39.018 Km requires replacement of Mettur Cauvery –Vellore CWSS laid pipes to upsize the Feeder main to cater the additional design demand up to year 2047. Around 7.684 Km length of pipe is proposed to connect/ extended to the proposed 16 Nos. of ELSR’s in this proposed scheme with DI pipes of diameter ranging from 100 to 600 mm. In total, constructing of proposed DI pipes for a length of 46.702 Km as depicted in the Drawings. The Sump wise details of the feeder main are as follows:

Existing Sump-wise Pipe Abstract - (Existing, Proposed and Replacement)

S.No Name of sump Proposed DI K7 mainlength in m Replacement DI K7 mainlength in m
100 150 200 250 300 350 150 200 250 300 350 400 450 500 600
1 Konavattam                   967          
2 Senpakkam             339                
3 Tharapadavedu-PM-1     2169   551   36 584   1216 3039   494    
4 Tharapadavedu-PM-2             1844 713              
5 Kalinjur 377       57     19   807   64      
6 Gandhi Nagar         57           754        
7 Katpadi   62   2669       766   1139          
8 Sathuvachari PM-1   667         203       2092        
9 Sathuvachari PM-2               602   1023 2833        
10 Ariyur   170             878            
11 Thorapadi               178              
12 Allapuram               856 1657     395      
13 Chiteri         204         769          
14 Thuthipattu       355         95            
15 Muthumandapam       120       1334   314   429 3027 332  
16 Virupatchipuram           70   2732       179      
17 Palavansathu                              
18 Muthumandapam
( Old Palar HWs)
      46       995 1845 1354         2115
19 Alamelumangapuram       110                      
  TOTAL 377 899 2169 3300 869 70 2422 8779 4475 7589 8718 1067 3521 332 2115
TOTAL 7684 39018

(2) Proposed Elevated Service Reservoirs

Under the present project, it is proposed to divide the corporation area into 67 Nos. of distinct water supply zone which will be having 67 Nos. of service reservoir based on the terrain/profile of the city and the population distributed. Each water supply zones shall be served by one Service Reservoir either existing or the new proposed reservoirs.

The ward/streets to be fed from each service reservoir have been identified in consultation with Corporation officials. The proposed service reservoir capacity has been worked out based on 1/3 of the zonal demand for intermediate stage.The details of each distribution zone like ward to be served, Intermediate population, Ultimate population, Intermediate water demand , Ultimate water demand, storage required, existing capacity, proposed capacity etc is furnished below:

The storage requirement for the intermediate period is 356.11 LL. The Existing storage including ongoing TWAD board ongoing construction accounts to 237.85 LL. Hence there is need for additional Storage requirement of 157.50 LL for intermediate design period, 16 Nos. of additional storage reservoir of capacities varying from 2.50 LL to 20.00 LL are proposed.

Summary of proposed ELSR and GLSR.

Proposed OHT’ Capacities (LL) No. of Tanks
20.00 2
15.00 2
12.50 1
10.00 2
7.50 6
5.00 1
2.50 2
157.50 LL 16

Out of 67 Nos. of proposed distribution zoning system, 31 zones will be served from the 31 Nos. of existing reservoirs, 20 Nos. of ongoing (VCWSS) reservoirs and 16 Nos. of proposed reservoirs will serve the remaining Vellore Corporation.

Details of Proposed Service Reservoirs

S.No Zone No. Tank Name Wards Covered Population Storage Provided (LL) Staging Height (m)
1 Zone-01 Pannai Kuttai, Pallikuppam 2 4395 2.5 16
2 Zone-03 Padmavathi Nagar,kalpudur 1,2,3,5 32225 12.5 16
3 Zone-08 Near VIT,Eachanodai 4,8,9,12,13,14 50931 7.5 22
4 Zone-09 Gopalasamudram 7,10 18265 7.5 16
5 Zone-19 Near Amma unavagam (Opp.to G.Nagar Post Office) 2,4,13 20012 20 22
6 Zone-20 EB Colony, Mahalakshmi Nagar 10,11,15 23619 10 16
7 Zone-21 Gandhinagar West (Jaffrapet Road) 10,14,15 4818 2.5 16
8 Zone-24 Konavattam 20,21,22 27100 15 22
9 Zone-29 Dhobi Colony,(Near Muthumandapam) 56,57,58,60 38364 7.5 22
10 Zone-46 Alagiri Nagar 30,31 12273 10 16
11 Zone-49 Kannikoil St,Vinayagapuram 43,44,45,46 43999 7.5 22
12 Zone-61 Chitteri 46,47 19703 15 16
13 Zone-63 Otteri(opp.to Park) 47,48 16927 20 22
14 Zone-65 Ariyur( Near CWSS Sump) 47,48,49,50 39961 7.5 20
15 Zone-66 Edayansathu 44 13353 7.5 22
16 Zone-67 Chinna kulavimedu 26,59 18174 5 16
  Total Capacity (LL) 157.50  

(3) Proposed Distribution Network System:

The existing distribution system in the town are rezoned and rearranged with the inclusion of unserved area. The proposed distribution system will have 67 Nos. of water supply distribution zones. Under the proposed system, 67 Nos. of Reservoirs will be operational for the distribution system. Each reservoir will have a defined area of distribution and hydraulically separated from each other. Zonal boundaries of each zone have been marked in the plan, taking into account the commanding levels.

Hydraulic design of proposed water supply distribution zone was performed using EPANET software. The input of model consists of a network of nodes and pipes in a distribution zone. The parameter of each node and pipe such as length, diameter, pipe material, design flow (ultimate) rate, peak factor, and ground elevation of the node along with the source node with its elevation form the input required to simulate the distribution network. The model then simulates the operating condition of the zone and calculates the best possible combination of pipe size to obtain the pre specified minimum residual pressure for the rated water demand.

The objective of performing a detailed analysis is to obtain the required distribution piping for the rated ultimate stage water demand. The procedure adopted in obtaining the final extent of design improvement in a distribution zone is listed below:

Required data as outlined above are entered. A preliminary simulation is first performed where the model assigns the minimum required pipe diameter in each of the pipe to provide the minimum residual head specified. On further refinement to the design run, section where residual pressure is less than minimum residual head are replaced with higher diameter pipes. This simulation is performed until all pipes within the system are capable of supplying water at or higher residual head than specified and with the permissible limit. Based on the finalized hydraulic design, the size of pipes for the water distribution network is arrived.

The proposed distribution zones will have 830.672 Km length of water supply distribution network. The total length of pipe includes 48,027 Km of Existing (AC, CI & PVC) Pipes Retained, 83,433 Km of CWSS (DI) pipes Retained, 5,423 Km of CWSS (DI) pipes retained up to Intermediate Stage, 404.044 km of pipes replaced for existing pipes, 13,648 Km of replaced for CWSS pipes and 276.097 Km of pipes proposed for extended areas. The total length of road is only 818.527 Km as per the actual survey drawings provided by the Vellore Corporation. Pipe to be laid under this scheme is about 693.789 Km. Cost economics and advantages of replacing entire distribution system can be examined. House Service Connection.

(4) Proposed House Service Connections

Under this project new house service connections with MDPE pipes along with Flow Control valves shall be provided in existing retained lines, replacement/ refurbishment lines and he to the new pipes for the uncovered areas. The details of HSC are given in table below:

S.No Details Diameter (mm) In Replacement Network In Proposed/ Extended Network Total Numbers
1 HSC with MDPE pipes for Domestic connections 20 36,667 50,409 87,076
2 HSC with MDPE pipes for Non-Domestic connections 25 390 430 820
Total 37,057 50,839 87896

(5) Proposed Pumpsets

(a) Gandhi Nagar Sump:

Out of 3 SRs proposed under this Sump, the Existing Pump set is sufficient to pump Gandhi Nagar West SR only. The Other 2 SRs can be fed by providing additional Pump set in the Ex. Sump itself and by providing connecting main of 350 mm DI K9 pipe to a length of 30m. The existing Pump set will be utilized exclusively for feeding water at the rate of 146 Lpm to Gandhi Nagar west SR.Open Well Type Submersible Pump set - 10 HP with Proportionate discharge of 1179 Lpm against the required head of 28 m matching with discharge of existing Pump set is proposed.

(b)Konavattam Sump:

The Existing Pump set is intended to feed single SR only. Providing addl. Sump and Pump set at SR site is not feasible. Hence, new Pump set is proposed to replace the Existing Pump set. Open Well Type Submersible Pump set -12 HP with discharge of 1357 Lpm against the required head of 31 m matching with discharge of existing Pump set is proposed.

(c) Sathuvachari Sump Pumping-2:

In order to utilize the existing Pump set and to feed all the SRs, it is proposed to collect the requirement of Cup & Saucer SR in a proposed addl. Sump with pump room and a Pump set at the SR site itself are proposed.Sump of capacity 0.25 LL at Cup & Saucer SR site. Pump room of size 2 x 2 m at Cup & Saucer SR site.Open Well Type Submersible Pump set -4.5 HP (696 Lpm x 22 m) in the proposed sump at Cup & Saucer SR site.But as per site conditions the above components are not required,hence deletion proposal has been submitted now.

(d) Alamelmangapuram Sump:

The Existing Pump set is intended to feed single SR only. Providing addl. Sump and Pump set at SR site is not feasible. Hence, a new Pump set is proposed to replace the Existing Pumpset. Open Well Type Submersible Pump set -15 HP with discharge of 1033 Lpm against the required head of 43 m matching with discharge of existing Pump set is proposed.

(e) Thorapadi Sump:

The Existing Pump set is intended to feed two SRs . Providing addl. Sump and Pump set at SR site is uneconomical and not feasible. Hence, new Pump set is proposed to replace the Existing Pump set.Open Well Type Submersible Pump set -15 HP with discharge of 1848 Lpm against the required head of 27 m to feed both the SRs is proposed.

(f) Chitheri Sump:

The Existing Pump set is intended to feed single SR only. Providing addl. Sump and Pump set at SR site is not feasible. Hence, new Pump set is proposed to replace the Existing Pump set. Open Well Type Submersible Pump set -5 HP with discharge of 416 Lpm against the required head of 39 m matching with discharge of existing Pump set is proposed.

(6) Funding Pattern:

The details of funding pattern as already accorded for Rs 234.93 Crores is detailed below.

  • GOI Share (50%) - Rs 117.46 Crores
  • GTN Share (20%) - Rs 46.98 Crores
  • ULB Share (30%) - Rs 70.49 Crores

The excess cost of Rs 5.99 Crores (240.92 – 234.93) over the sanction amount will also be met out by ULB

(7) Maintenance of the Scheme:

On completion of the Project, the scheme will be handed over to the local body for further maintenance.

(8) Present Stage of the Scheme:

The work order for the scheme has been issued on 17.06.2017 and work commenced on 21.07.2017. So far, 31% of work has been completed and expenditure incurred is 73.28 Crores (31%) .This scheme is targeted for completion by 7/2019 .

Salient Details

Open