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Section: Major Water Supply Schemes pages are not under access control

Dedicated Water Supply Scheme to Erode City Municipal Corporation Under Amrut.

Quantity : Int – 115.90 MLD, Ult – 149.17 MLD
Cost of Installation : Rs.484.45 Crores
A.M Cost : Rs.15.77 Crores.

 Prefatory :

Dedicated Water Supply Scheme to Erode City Municipal Corporation in Erode District was Administratively sanctioned vide G.O.Ms.No.109/MAWS(MA2) /Dated.29.08.2016 for Rs.484.45Crores under AMRUT programme with funding pattern of Government of India share 50%-242.23 Crores,Government of Tamilnadu share 20%-96.89 Crores and Urban local body contribution of 30% - 145.33 Crores.

Erode Town is the headquarters of Erode District, in Tamilnadu State which was bifurcated from the Coimbatore District in the year 1979. The Town is located at a distance of 100 Km east of Coimbatore and is close proximity to the west bank of Cauvery River. Erode District is a very important market centre for Turmeric. Erode Town was constituted as a Municipality in the year 1871. It was elevated as a special grade Municipality on 01-03-1980 and upgraded as Corporation with effect from 01-01-2008 consisting of Erode, Surampatti, Peelamedu, Sarkar Chinna Agraharam revenue villages with an extent of 8.35 Sq.Km. The Corporation area has been extended as per the Tamilnadu Government order No.51, MAWS Department dated 17-03-2010,with the inclusion of local bodies adjacent to Erode,such as Kasipalayam,Veerappanchathiram,Surampatty,Periyasemur(grade III Municipalities)BP Agraharam and Suriampalayam (Town Panchayats) and Thindal, Ellapalayam, Villarasampatti, Gangapuram and Muthampalayam (Panchayats). Now the total extent of the Erode City Municipal Corporation is 109.52 sq.km and is divided in to 60 wards. As added areas were only a town panchayats / Municipalities earlier, the infrastructure was serving the population as per the capacity of panchayats / Municipality. At present, they have become part of the Erode Corporation and it was in a compelling situation to serve both the growing population needs and also as per the per capita norms of the urban / corporations. As water supply is one of the primary key indicative factors for the economic development, it was decided to take up the water supply system to the above added area.

Details of Local Bodies merged with Erode City Municipal Corporation
Sl.No Municipality Name Status Area (sq.km) Population as per 2001 census Population as per 2011 census Density of Population per sq.km(2011)
1 Erode Special grade Municipality 8.35 150541 156953 18797
2 Veerappan Chathram III Grade Municipality 7.36 72703 84437 11473
3 Surampatti III Grade Municipality 3.17 31948 41897 13217
4 Kasipalayam III Grade Municipality 25.64 52500 73375 2862
5 Periyasemur III Grade Municipality 9.13 32024 55281 6055
6 B.P.Aghraaram Town Panchayat 10.81 21458 24615 2277
7 Suriampalayam Town Panchayat 17.71 21893 28554 1613
8 Thindal Panchayat 5.89 10084 15433 2621
9 Gangapuram Panchayat 7.17 4337 5840 815
10 Ellapalayam Panchayat 3.20 1921 2503 783
11 Vilarasampatti Panchayat 7.86 4560 7439 947
12 Muthampalayam Panchayat 3.22 1477 1794 557
  TOTAL   109.52 405446 498121 4548

Existing Water Supply Arrangements:

Present system

All the Municipalities and Panchayats, now merged with the Corporation, are currently having independent water supply system or drawing water from Combined Water Supply System. To present a holistic picture, details of existing system have been collected from various sources and furnished below for easy reference:-

Present water supply system

Sl.No Head works Year of Commissioning Designed Qty MLD Present supply MLD
1 Vairapalayam Erode 1919 and 1987 30.00 18.00
2 Vendipalayam 2002 3.20   2.80
3 Muthampalayam WTP 2002 2.20 1.80
4 Surampatti and Kasipalayam 1979 8.82 5.20
5 Periyasemur 1999 5.88 3.80
6 Veerappanchatram 2001 10.20 8.60
7 BP Agraharam 2008 3.79 2.82
8 Suriampalayam 2001 3.50 2.80
9 Kothukaranpudur 1993 1.69 1.40
         
      69.28 47.2
  Losses in Transmission main 7%     3.31
  Losses in Distribution main 21%     9.92
  Water supply at Consumer end     34.00

At present, the availability of water at consumer end is 34mld after deducting Transmission losses at 7% and Distribution losses at 21% and it works out to 64 lpcd for the present population of 5,35,000.

Erode Erstwhile Corporation

Erode Municipal water supply system is ninety three year old. The first scheme was commissioned in 1918 and improvement/expansion to the system was implemented in 1987. Detailed Project Report for Water Supply Improvement Scheme was prepared in 2003 by a separate Consultancy and the proposals have been implemented. The components of the existing water supply system and the proposals under water Supply Improvement Scheme (WSIS) -2003 and implemented are described below.

a) Source

The surface flow in the River Cauvery is tapped at Vairapalayam village where water supply head works with treatment facilities are provided. Water drawn is pumped to the treatment plant located nearby. Under the second scheme a separate collection cum suction well has been constructed at a few hundred meters upstream of the old suction well. Water is drawn from the river through a leading open channel, which is connected to the new collection-cum-suction well. The raw water at the present drawl points are polluted due to discharge from the industries especially the tanneries and dyeing and bleaching industries. To avoid drawl of raw water with high pollution concentration, water is drawn from locations far away from the right bank. For this purpose the leading channel has been deepened partly and a 600mm dia CI pipe laid for about 110m, so as to tap water from the centre of the river and diverting the polluted water in a different course along the river margin with temporary structures.

For the Panchayats now included in the Corporation, water supply is made from the combined water supply schemes maintained by TWAD Board. Reliable and safe water supply system is required for the Corporation to ensure the supply of safe drinking water to the population anticipated in another 30 years at 135 lpcd as per CPHEEO norms.

Details of Intake at Vairapalayam
S. No Component Under Scheme 1 (1918) Under Scheme 2 (1987) Other Improvements (2001)
1 River Intake Mid stream well (8.2 m dia. and 10.3 m depth) with suction well (3 m dia. and 12 m depth) on the river bank Raw water collection/ suction well along the River bank with 600 mm CI pipe -85 m to concentric well. Concentric well to river 55 m RCC Chamber 32 m (2001) and 600 mm CI pipe for a length of 236 m Platform extended to the middle of the river to draw pollution free water.
2 River intake pumps 2 Nos 6158 LPM 19.52 m vertical type centrifugal pumps with 50 HP Kirloskar motors. 2 Nos. 11380 LPM 21 m vertical type turbine pumps with 75 HP Kirloskar motors 4 Nos 4050 LPM 22.87 m Worthington pumps with 30 HP motors ( various makes)

b) Treatment of water

The treatment plant at Vairapalayam consists of aeration, clarification and filtration. In the old scheme, which was installed during 1918, water is aerated and then allowed to settle in a settling tank. Finally it is filtered in 2 nos. Rapid Sand filters. One of the filters is circular in shape with 4.56m diameter. Another one is rectangular of size 5.47m x 3.65m. Under stage II of old scheme raw water is aerated and then subjected to clarification, after adding required dosage of alum, in a clariflocculator of size 14m dia and 3.65m depth. The water is then filtered in two nos. of rapid sand filters of size 4.56m x 4.26m each.

The total capacity of stage I filters of old scheme viz, circular and rectangular filters is 3026 lpm. The total capacity of 2 nos. of stage II filters is 3480 lpm. Thus the filter units of the old schemes are capable of producing about 7.8MLD (20 hours operation equivalent).

In the improvement scheme which was carried out during 1987, water is aerated in a cascade aerator and then subjected to clariflocculation after addition of required chemicals in a clariflocculator of 35m dia and then filtered in 4 nos. of Rapid sand filters of size 9.70m x 7.00m each. This unit is capable of producing about 22.5MLD (20 hours operation equivalent). The filtered water is stored in underground reservoirs and pumped for distribution. The Municipality now supplies about 21 MLD.

c) Location and capacity of OHTs and GLSRs in Erode

 
S. No Location Capacity LL
1 VOC Park GLSR 20
2 VOC Park GLSR 5
3 VOC Park OHT 11
4 Karungalpalayam OHT 7
5 Kadharpatcha Road OHT 7
6 Gandhinagar Nagar OHT 7
7 Chennimalai Road ( 2 OHT) 20
8 Gandhiji Road OHT 30
  Total 107

The capacities of the above tanks are not matching with the demand of the respective area they supply resulting in inadequate supply in some parts of the town.

d)Distribution Network

The population of Erode municipality as per 2001 census was 150541 covering an extent of 8.35 sq.km with 45 wards (old) and is divided into 7 zones for the purpose of distribution of water. Water from Vairapalayam Head works is received in the two ground level reservoirs and seven OHTs in different locations and distributed to the respective zones.

The total length of distribution main in the town is about 164 km. There are about 17227 service connections of which 10683 service connections are metered and about 4928 properties do not have meters. The remaining 1616 are commercial connections.

The town is presently supplied with water for a period of 4 to 8 hours on alternate days.

Necessity of Dedicated Water Supply Scheme to Erode Corporation

Inclusion of local bodies adjacent to Erode Erstwhile Corporation, such as Kasipalayam, Veerappanchathiram, Surampatty, Periyasemur (grade III Municipalities) BP Agraharam and Suriampalayam (Town Panchayats) and Thindal, Ellapalayam, Villarasampatti, Gangapuram and Muthampalayam (Panchayats) has resulted in increase in population which in turn warranted for increase in water demand. As added areas were only a town panchayats / Municipalities earlier, the infrastructure was serving the population as per the capacity of panchayats / Municipality. At present, they have become part of the Erode Corporation and it was in a compelling situation to serve both the growing population needs and also as per the per capita norms of the urban / corporations . Apart from this, during summer season due to shortage of water the supply is maintained once in two days in Erode old city limits, while in the sub urban areas supply is maintained once in seven days. As water supply is one of the primary key indicative factors for the economic development, it was decided to take up the water supply system to the above added area.

Over the years the source has become highly polluted at the present drawal points due to discharge of untreated sewage from adjoining towns and effluent from tanneries, bleaching and dyeing industries along the banks of River Cauvery and River Bhavani, Hence it is necessary to identify alternate location for the drawl of raw water free from pollution to meet the demand/requirement of present, intermediate and ultimate population of entire Erode City Municipal Corporation area as per CPHEEO norms. Hence Erode City Municipal Corporation appointed a Consultant for the preparation of Detailed Project Report for Dedicated Water Supply Scheme to Erode City Municipal Corporation.

Population and Demand

Design Period

The design periods to be adopted were discussed during the Technical Review Committee held on 26.07.2012 and finalized as below:

Design Period 30 Years
Immediate design Year 2017 (Base year )
Intermediate design Year 2032
Ultimate design Year 2047

Design Population

Detailed Project Report has been finalized for Underground Sewerage Scheme for the five Municipalities viz. Erode, VeerappanChathiram, Kasipalayam, Surampatty and Periasemur and also for B P Agraharam Town Panchayat through a separate Consultancy and work is in Progress. The design period adopted for UGSS is 30 years with 2010 as base year. However it was decided to revise the population projections for entire corporation area taking into account 2011 census population also.

The census population figures of the years 1981, 1991, 2001 and 2011 were taken in to consideration for projecting the population for the design periods. The population for the designs periods was projected adopting the methods suggested in CPHEEO manual.

Water Demand

Assessment of water demand.

Under the Dedicated Water Supply Scheme to the Entire newly formed Corporation Area, the water demand is assessed based on the Population projections made and with the following norms as per the guidelines of CPHEEO Manual.

Base water demand 135 lpcd
Distribution losses 10%
Transmission Losses 1%
Water Treatment losses 3%

As discussed with the officials of Erode Corporation and approved, the Industrial/Bulk demand is assumed as 5 MLD for the present,7.5 MLD for intermediate stage and 10 MLD for ultimate stage.

The projected water demand for the Immediate/Intermediate/Ultimate design Years has been worked out based on the above norms The abstract of the Demand for the design periods are as below.

For the Immediate design year 86.10 MLD (Raw water 90 MLD)
For the intermittent design year 114.75 MLD (Raw water 120 MLD)
For the Ultimate design year 147.69LD (Raw water 155 MLD)

Project Components

Raw Water Intake

The head works consisting of River Intake, Raw water pumping station, Water Treatment Plant and Clear Water Pumping station is proposed to be located in 8.60 acre land (4.60 acre in SF No. 302, PWD land & 4.00 acre in SF No.217, Government land) in Village No.57, Varathanallur Village of Bhavani Taluk on the right bank of River Cauvery and about 1.5 Km upstream of Urachikottai Barrage. The Raw water drawal arrangement will be through an intake cum pump house of rectangular size 27.00m x 10.50m constructed over RCC framed structure. The size of the pump house has been fixed to provide four pumps(3 working & one stand-by) for intermediate period requirement and space to add two more pumps (total 6 pumps with 4 working & 2 stand-by) at the later stage for the ultimate period requirement.

Details of the hydraulic level of the Proposed Project
Sl.No Description Level (in m)
1 River Bed Level 156.0
2 LWL in Cauvery River at Uratchi Kottai 157.5
3 MWL in Cauvery River at Uratchi Kottai 166.0
4 WTP - Finished Ground Level 173.0
5 Lip of Cascade Aerator 179.0
6 LWL in Clear Water Sump 168.0
7 Maximum Water Level in Clear Water Sump 173.0
6 GL at Suriampalayam Sump 172.0
8 Min.WL at Suriampalayam Sump 170.0
9 Max.WL at Suriampalayam Sump 174.0
10 GL at VOC Park 178.0
11 Min.WL at VOC Park Sump 176.0
12 Max.WL at VOC Park Sump 180.0
13 Ridge Point in Transmission main if any Exist at off- take and Terminal points.

Raw Water Pump set

The pump sets are designed for the interim quantity and to match the head required for interim demand. It is proposed to install vertical turbine pump sets, each of duty 29000 LPM against a head of 28m, three working and two standby with a total pumping capacity of 87000 LPM to meet the interim demand. The design is based on 23 hours pumping rate.

Raw Water Transmission Main

The raw water pumping main is proposed for a length of about 100 m for conveying raw water from intake works, located at the bank of the river Cauvery, to the proposed treatment plant to deliver 155MLD of raw water for ultimate demand.

Considering quality of manufacturing and testing within the factory and experience, spirally welded MS pipe (with internal lining and external guniting using cement mortar) are proposed. The pipeline is designed for ultimate demand. The effective diameter is arrived as 1373 mm dia. Shell thickness of 12.50mm is found to be adequate. (Pipe shell internal diameter will be 1397 mm and outer diameter will be 1422 mm. internal lining is 12mm thick cement mortar and external protective coating is 20 mm thick cement mortar guiniting).

Water Treatment Plant

The proposed Water Treatment Plant will be constructed in 8.60 acre land (4.60 acre in SF No. 302, PWD land & 4.00 acre in SF No.217, poramboke land) ofNo.57, Varathanallur Village of Bhavani Taluk on the right bank of River Cauvery and about 1.5 Km upstream of Urachikottai Barrage. The treatment plant layout has been planned for the ultimate stage requirement of capacity 150 MLD. The present construction will be for 115 MLD with cascade aerator alone for 150 MLD with two outlets for 115 MLD and 35 MLD. This modular construction has been proposed for two reasons (i) to reduce the initial cost and (ii) the raw water quality is good for most of the chemical characteristics and probably a higher loading rate is possible for the various components of WTP. For this purpose components like raw water main, and cascade aerator collection tray etc which cannot be expanded later on will be constructed for the ultimate capacity while components like flash mixer, clarifiers, filters, pumps etc will be provided for the intermediate capacity with provision to expand it later whenever required. The layout is prepared to provide space for future expansion to ultimate capacity at a later stage.

The details of components of WTP proposed with design period are as below:

1 Flow rate.
Treated Water output
Raw water input including losses and recycle flow
Rate of flow in to WTP
 
115MLD (Intermediate period requirement)
120 MLD
5000m3/hr or 1.39 m3/s
2 Cascade Aerator.
Flow rate
Diameter
Hydraulic height
Number of steps with rise of each step at 0.60m
For Ultimate period requirement
6250 m3/hr
12.00 m
2.40 m
4
3 Distribution chamber.
Flow rate
Shape
For Intermediate period requirement.
120000 m3/day or 5000 m3/hr
Rectangular of size 10.50m length, 3.50m width, 2.50m liquid depth With three compartments of 3.50 m length each.
4 Flash Mixer
Number of tanks
Retention time
Surface area
For Intermediate period requirement.
3
60sec
12 sq.m; Size of each tank: 3.50m x 3.50m x 2.50m LD
5 Clariflocculator:
a. Flocculator

Number of tanks
Retention time
flow rate


b. Clarifier

Number of units
Retention time
Size


c. Alternatively Lamella Tube type Clarifier

Flow
Number of units
Size

For Intermediate period requirement.
3
60sec
12 sq.m; Size of each tank: 3.50m x 3.50m x 2.50m LD  
3
3 hours
51.00 m dia and 3.50m LD
 
5000 m3/hr, Number of
3
15m x 15m x 4.10m LD
6 Rapid Gravity Sand Filters:
Loading rate
Number of twin beds required
Number of beds proposed including stand-by
Size
For intermediate period requirement.
100 lpm/Sq.m, area of filter bed: 896 sq.m.
17
20
8.00m x6.50m each
7 Filtered water channel to storage tank:
flow rate
size
Number of beds proposed including stand-by
Size
 
For intermediate period requirement.
100 lpm/Sq.m, area of filter bed: 896 sq.m.
17
20
8.00m x6.50m each
8 Back-wash water holding tank and pumps
Size of the tank
Number of pumps foroperation
stand-by
 
14m dia and 3m LD
2
1
9 Alum solution tank and dosing:
Number of tanks for operation:
stand-by
size of each tank
 
2
1
3mx 3m x 2.60m LD; Dosing pumps 2 for operation, one stand-by.
10. Lime solution tank and dosing:
Number of tanks for operation
stand-by
size of each tank
 
2
1
1.75mx 1.75m x 2.60m LD; Dosing pumps 2 for operation, one stand-by.
11 Poly electrolyte solution tank and dosing:
Number of tank:
size of tank:
 
1
1.5mx1.5m x 2.60m LD; Dosing pumps 2 for operation, one stand-by.
12 Pre-Chlorination and Post Chlorination facilities:
Size of the chlorinator room:
Dosage of pre-Chlorination- 2mg/l and Post- Chlorination- 2mg/l Working chlorinator capacity; 12.50kg/hr for each application and one stand-by. Booster pumps to be provided for 6 m3/hr
10mx5m
13 Area of building for Chemical storage; for Alum & Lime: 180 sqm, For Chlorine tonner 50 sq.m
14 Over Head Tank for water
Capacity
size
 
30 m3
5mx4mx1.50m LD

Salient levels for the design of WTP are as below:

Level at Lip of cascade aerator 177.00
Lower water level at clear water sump 170.75
Top water level at clear water sump 176.00

Clear Water Reservoir and Pump House

An underground sump -52.00 LL and pump house is proposed for storing the treated water and pump it from the WTP site to the Ground Level Reservoirs at Suriampalayam – 42.00 LL and VOC Park- 118.00 LL. Required Land is available within the WTP area. The pump house of size 27.00m X 7.40m is proposed above the clear water sump having two compartments with overall size of 36.00m x 27.00m x 5.55m (effective storage depth). The effective storage will be for about 60minutesrequirement of ultimate demand. The size of the pump house has been fixed to provide 5 pumps(3 working & 2 stand-by) for intermediate period requirement and space to add one more pumps (total 6 pumps with 4 working & 2 stand-by) for the ultimate period requirement.

Clear Water Pump Sets

The pump sets are designed for the interim quantity by installing vertical turbine pump sets, each of duty 29000 LPM against a head of 30m, three working and two standby with a total pumping capacity of 87000 LPM The design is based on 23 hours pumping rate.

Clearwater pumping main from WTP to ground level receiving sump at VOC Park with a branch line to ground level sump at Suriampalayam

The treated water from WTP will be conveyed to the ground level sumps/reservoirs to be located at Suriampalayam and at the land near VOC park. The total length of transmission main with spirally welded MS pipes of size 1297mm with 10mm thick (with internal lining and external guniting using cement mortar) is about 22000 m from WTP location at Varadanallur to sump at the site near VOC park.

The alignment will be through the existing road from WTP site to junction of Mettur Bhavani road and along the Mettur-Bhavani-Erode State Highway 20, crossing Bhavani River, Kalingarayan Canal and NH 47.

Ground level receiving sump and pumping arrangements at Suriampalayam and at the land near VOC park

Based on the profile of the Erode Corporation area it is proposed to provide Ground level receiving sumps and pumping arrangements at Suriampalayam ( 36.00m x 27.00m x 5.55m) and at the land near VOC park (57.80m x 40.00m x 5.0 m )to receive the treated water and pump it to ELSRs through feeder mains for distribution. The transmission main from WTP will discharge treated water into these sumps.

Feeder Main

The contour of the corporation area varies from 160 m to 220 m. considering the topography of the entire corporation area; feeder mains are proposed for delivering the treated water to the reservoirs (ELSRs). Feeder main size is designed for conveying Ultimate period flow.

Feeder Main I will be of diameter 350 mm to100 mm to convey ultimate period flow. For pumping water 2 pump sets are proposed, one for operation and one for standby. The duty of each pump sets proposed is 2750 lpm against 35 m head based on the intermediate period flow. Later on these pump sets may be replaced with higher capacity pump sets for ultimate period flow requirements in the same pump house.

Feeder Main II will be of diameter700 mm to 100 mm to convey ultimate period flow. For pumping water three pump sets are proposed, two for operation and one for standby. The duty of each pump sets proposed is 5600 lpm against 65 m head based on the intermediate period flow. Later on these pump sets may be replaced with higher capacity pump sets for ultimate period flow requirements in the same pump house.

Feeder mains from the sump near VOC Park

Feeder Main III will be of diameter 900 mm to 100 mm to convey ultimate flow. For pumping water three pump sets are proposed, two for operation and one for standby. The duty of each pump sets proposed is 16000 lpm against 45 m head based on the intermediate period flow. Later on these pump sets may be replaced with higher capacity pump sets for ultimate period flow requirements in the same pump house.

Feeder Main IV will be of diameter 900 mm to 100 mm to convey ultimate flow. For pumping water three pump sets are proposed, two for operation and one for standby. The duty of each pump sets proposed is 13000 lpm against 45 m head based on the intermediate period flow. Later on these pump sets may be replaced with higher capacity pump sets for ultimate period flow requirements in the same pump house.

Summary details of all Feeder mains:

Feeder mains Length in m
Material Diameter (mm) FM-I FM-II FM-III FM-IV Total
D.I Pipe
100 840 3384 733 2905 7862
150 270 382 630 925 2207
200 1055 5771 86 2702 9614
250 1830 148 1685 2601 6264
300 1010 1670 2175 190 5045
350 720   3920 1075 5715
400   3549 1011 1772 6332
450   1755 3574 4684 10013
500     2377 1000 3377
600   2974 4524 525 8023
M.S. Pipes
700   10941 1978 617 13536
800     129   129
900     252 1314 1566
Total length in m 5725 30574 23074 20310 79683

Sump and pumps

All the ELSR excepting Vidyanagar, Odakattuvalasu and Ganapathynagar are fed directly by the feeder mains. In the case of above three ELSR’s the ground level does not permit direct filling into the ELSR. Hence it is proposed to provide sumps at these three locations. The water will be received in these sumps and pumped to the overhead tanks. The storage capacity of the sumps are designed for the intermediate design requirement. The details of sump and pumps provided at these three locations are given in Table below:

Details of Sump and Pumps Provided in the System
S.No Location Details of Sump & Pump House Details of Pump
1 Vidyanagar Sump - 0.37 ML –12.0 m Dia
Pump House –12.0 m dia
3225 lpm x 25 m head
HP Pumps - 1 Working and 1 Standby
2 Odakattuvalasu Sump - 0.295 ML – 12.0 m Dia
Pump House – 12.0 m dia
2750 lpm x 25 m head
10 HP Pumps - 1 Working and 1 Standby
3 Ganapathynagar Sump - 0.31 ML – 12.0 m Dia
Pump House – 12.0 m dia
2700 lpm x 25 m head
15 HP Pumps - 1 Working and 1 Standby

Service Reservoirs

Existing Service Reservoirs

In the existing water supply distribution system the capacity of reservoir is ranging between 0.6LL to 20LL with the staging height of 6.0m to 15m. As per the TOR the proposed distribution system shall be designed for a minimum residual head of 7.0m at taping point of consumer connection, to achieve this the service reservoir should have minimum stating height of 12.00m.In view of above the existing reservoir having capacity less than 1.00LL and with staging height less than 12.00 is not considered in the present proposal, since these will not fulfill the residual head requirement. Accordingly 47 Nos of existing service reservoirs are considered in the proposed distribution system. The total capacity of existing service reservoir is about 218.00LL as against 346.00LL for the intermediate requirement.

Service Reservoirs in the Proposed System

To fill the gap between the available capacity and the required capacity, new tanks have been proposed and the details of storage capacity of existing reservoirs and proposed reservoirs (ELSRs for Distribution) are given in Table below.

     
Details of water supply zone & Capacity of Service Reservoirs
Feeder Main Area Name Zone No Name of the ELSR Intermediate Demand Requirement Available Capacity in (LL) Proposed Capacity in (LL) SR Capacity in the Proposed System (LL) Status
FM-I
Suriyampalayam
48 Mayapuram 2.96 1.5   1.5 E
56 Ramanathapurampudur 7.23 2.5   2.5 E
58 Perumal malai 14.63   5 5 P
50 Indirapuram 1.39 1   1 E
51 Maravapalayam 3.89 1.5   1.5 E
54 KKPudur Ex 1.48 1   1 E
55 KKPudur Prop 8.48   5 5 P
FM-II
Suriyampalayam
49 Matheswaran Nagar 3.25 1   1 E
52 JJ Nagar 5.29 2   2 E
58 Perumal malai 14.63   5 5 P
53 Bharathi PerumalNagar 4.67 1.5   1.5 E
59 Samathuvapuram 5.66   2.5 2.5 P
57 Revenue colony 9.28   5 5 P
Outer Municipality
65 KK Malai 13.06   5 5 P
66 Al-Amin Nagar 6.47   2.5 2.5 P
67 Udayam Garden 20.22   5 5 P
68 Vidya Nagar 42.57   15 15 P
Kasipalayam
19 Periyasadayampalayam 20.49   7.5 7.5 P
22 KK Nagar 0.7 1   1 E
23 Muthampalayam Housing Unit-Phase-I Ex 9.84 3.5   3.5 E
24 Rangampalayam Existing 1.88 1   1 E
25 Odakatta Valasu Prop 31.01   12.5 12.5 P
FM-III
VP Chathiram
39 Kakkan Nagar 29.58   10 10 P
40 Bhavani Road 14.93 10   10 E
41 Bhavani Road 8.51     E
BP Agraharam
60 BP Agraharam 6.02 5   5 E
61 Ajanthanagar 5.61 2   2 E
62 Eduga street 2.9 2   2 E
64 VGP Nagar 3.85     1.5 P
Erode Municipality
1 VOC Park-5LL 12.27 5   5 E
2 VOC Park-11LL 32.32 11   11 E
3 VOC Park-20LL 44.53 20   20 E
4 Karungal Palayam 17.21 7   7 E
9 Karungal Palayam 26.25 10   10 E
7 Gandhi Road 76.7 30   30 E
8 Kadhar Batcha 9.88 7   7 E
5 Chennimalai-1 13.19 10   10 E
5 Chennimalai-2 13.19 10   10 E
10 Periyar Nagar 11.55 5   5 E
Kasipalayam
11 Sudhandhira Puram 4.42 1.5   1.5 E
12 Kollampalayam Housing Unit-1 Prop 36.79   12.5 12.5 P
13 Kollampalayam Housing Unit-2 Ex 2.57 1   1 E
14 Dollars Colony 12.56   5 5 P
15 Ketti Nagar Ex 3.09 1   1 E
16 Bharathi Nagar Ex 14.96 5   5 E
17 Thanigai Nagar Prop 11.6   5 5 P
18 Muthusamy Colony Ex 2.95   1 1 E
20 Muthusamy Colony Ex 3.85 1   1 E
21 Muthampalayam Housing Unit-Phase-II Ex 4.4 1.5   1.5 E
FM-IV
VP Chathiram
42 Bharathi Theater-2 Prop 33.58   12.5 12.5 P
43 Bharathi Theater-1 Ex 22.11   8 8 E
44 Sampath Nagar 8.39 3   3 E
45 Manikampalayam Housing Unit-1 EX 7.72 3   3 E
46 Kumalan Kuttai 13.65 5   5 E
47 Ganapathy Nagar 35.64   12.5 12.5 P
Periyasemur
26 CN College-4LL 10.41 4   4 E
27 CN College-1.5LL 4.61 1.5   1.5 E
28 EPB Nagar 10.7 4   4 E
29 Manikampalayam Housing Unit-2 Prop 56.86   20 20 P
30 SSP Nagar 9.06 3   3 E
31 Sengundhar Nagar 66.93   25 25 P
32 Vasanth Nagar 8.8 3   3 E
BP Agraharam
63 Gandhi Nagar 2.88 1   1 E
Erode
6 Gandhi Road 16.89 7   7 E
Surampatti
33 Municipal Office 9.71 4   4 E
34 Palayapalayam 13.41 4   4 E
35 Anaikattu 11.25 4   4 E
36 Kings Layout 11.82   5 5 P
37 Sastri Nagar-1 (IC) 22.07   15 15 P
38 Sastri Nagar-2 (OC) 20.39
      TOTAL 1037 218 188 407  

Note: E – Existing, P – Proposed

Distribution System

The distribution zones will have 799.06KM length of water supply distribution networks. The total length of pipeline includes 325.851 KM proposed for replacement with new pipe and 406.003KM for new pipe for uncovered and extended areas and using 67.208 km of existing pipes.

Details of Proposed Distribution Network System:

Details of Sump and Pumps Provided in the System
S.No Pipe Material Diameter (mm) Proposed Length
1 HDPE 110 592160
    160 68280
    225 26080
  TOTAL   686520
2 DI S/S K7 250 21440
    300 11460
    350 4790
    400 2740
    450 1170
    500 2460
    600 1240
  TOTAL   45300

House Service Connection:

House Service connections of 130000Nos (Domestic 120000 and Non Domestic 10000) is proposed in the new distribution system.

Project Cost

The total cost of the project as worked out on the above basis is Rs.484.45 crore

Present Stage

The work order for the scheme has been issued on 10.06.2017 and work commenced on 25.07.2017.

So far, 36% of work has been completed and expenditure incurred is 117.75 Cr (24%) .

This DWSS is targeted for completion by 07/2019 .

Salient Details

Open