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Thursday , 27th June 2019
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Underground Sewerage Scheme To Rameswaram Municipality In Ramanathapuram District

Administrative Approval has been accorded vide G.O.(D) No.225 /MA & WS  ( MA.II)Dept /Dt. 05.09.2012 for Rs 41.35 Crores and Revised Administrative Sanction accorded vide G.O.(D) No.44 /MA & WS  ( MA.II)Dept /Dt. 27.04.2018 for Rs 52.60 Crores.

I. Prefatory:

As per the directions from Government, the Tamil Nadu Water Supply and Drainage Board (TWAD Board) has undertook the investigation works and preparation of Detailed Project Report (DPR) for providing Underground Sewerage Scheme for Rameswaram Municipality in Ramanathapuram District during 09/2012. Rameswaram Municipality is not provided with underground sewerage system. This Rameswaram Municipality is provided with open drains in the main area of the town and septic tanks.

II. Necessity Of The Scheme:

The existing open drain system is not functioning satisfactorily. The water is stagnating in many places and due to that mosquitoes and flies are developed, which cause health hazards. In order to improve the hygienic conditions, underground sewerage system is a must for Rameswaram Municipality.

III. Population Projection:

In designing sewerage system for any town the important factor is the present population and its expected rate of growth. The concept of the base year 2019 is considered for projecting the intermediate population for 2034 (15 years from base year) and the ultimate population for 2049 (30 years from base year).

Design Population
Year Population
Base year 2019 25316
Intermediate Year 2034 33096
Ultimate Year 2049 43265

IV. Detailed Description Of The Proposal:

The proposed UGSS Scheme is designed for the ultimate stage i.e. year 2049.

The Sewerage work is divided into the following five categories and described subsequently.

  • House connections and local sewerage.
  • Main and trunk sewers.
  • Pumping stations.
  • Pumping main.
  • Sewage Treatment plant.

House Connection And Local Sewerage Including Branch Sewers:

The total number of house service connections calculated as 9206 Nos. The Rameswaram Municipality is divided into two parts in North- South directions for UGSS purpose, the Northern side is termed as Zone I and the Southern side is termed as Zone II.

House Service Connection Details
Description HSC
Domestic-110 UPVC 6857
Commercial – 160 UPVC 2349
Total 9206

Main And Trunk Sewers :

The total main and trunk sewer covers a total stretch of 13760 m and total manholes of 484 Nos.

Sewer line Details
Description Pipe Length without deducting MH size Pipe Length after deducting MH size
Zone1 Zone2 Total Zone1 Zone2 Total
160 mm UPVC 3693 5268 8961 3534 5049 8583
200 mm UPVC 702 1215 1917 672 1164 1836
150 mm DWC 593 --- 593 567 --- 567
250 mm DWC --- 412 412 --- 395 395
300 mm DWC --- 446 446 --- 427 427
150 mm CI 90 150 240 86 143 229
500 mm CI 372 205 577 356 195 551
600 mm CI 614 -- 614 584 --- 584
Total 6064 7696 13760 5799 7373 13172
Details of Manholes
Lower Range Upper Range Av depth Zone1 Zone2 Total
0.5 1 0.75 5 15 20
1 1.5 1.25 122 102 224
1.5 2 1.75 50 69 119
2 2.5 2.25 24 46 70
2.5 3 2.75 10 25 35
3 3.5 3.25 3 6 9
3.5 4 3.75 2 2 4
4 4.5 4.25 3 0 3
  TOTAL   219 265 484

Pumping Station:

The sewage generated from the Zone I is collected and is proposed to be conveyed to MPS near Hotel Tamilnadu. The sewage generated from the Zone II is collected at Sub Pumping Station near Thidal Mariamman koil and is proposed to be pumped to MH.No.14 of Zone-I. The capacity of collection well has been determined in such a way that for any combination of inflow and pumping, the cycle of operation for each pump will not be less than 5 minutes and maximum detention time will not exceed 30 minutes. Pumping quantity is 4.08 mld for intermediate and 5.34 mld for ultimate.

Pumping Main And Pumping Station:

Pumping Stations and Pumping Mains:

i. Main pumping Station (MPS)

Screen Well : 6.00 m dia x 5.07 m depth
Grit Well : 4.00 m Dia x 6.37m depth
Suction Well : 7.00 m Dia x 9.72 m depth
Pump sets : 2831 lpm x 51 m head (2 Nos.) - 1DWF
5662 lpm x 51 m head (1 No.) - 2 DWF
Pumping main : 300 mm dia CI A class Pipes for 3560 m length.
Pump room : 9 m x 5 m

ii. Sub pumping Station (SPS)

Screen Well : 5.00 m dia x 2.925 m depth
Grit Well : 3.20 m Dia x 4.185m depth
Suction Well : 7.00 m Dia x 6.66 m depth
Pump sets : 1776 lpm x 18 m head (2 Nos.) - 1DWF
3552 lpm x 18 m head (1 No.) - 2 DWF
Pumping main : 250 mm dia CI LA Class Pipes for 750 m length
Pump room : 9 m x 5 m

Sewage Treatment Plant:

It is necessary to provide complete biological treatment of sewage before disposal into a Forest land . The type of treatment is generally decided based on the effluent standards prescribed by the regulatory agencies, such as Central Pollution Control Board, Tamil Nadu Pollution Control Board.

Considering the available skills and the fact that, the sewage treatment is going to be a new area of activity for the local body to handle, Extended aeration method is proposed for this Scheme.

Details of Sewage Treatment Plant:

Capacity of STP : 4.08 MLD
Technology : EASP Technology
Extent allocated : 5.00 Acre
Area Required : 3.40 Acre
Final Disposal : Reuse after let into Forest land

V. Cost Of The Scheme:

The total cost of the scheme works out to Rs. 52.60 Crores.

VI. Mode Of Finance:

The Scheme will be implemented for Rameswaram Municipality under AMRUT Schemes.

1 GoI share Rs.20.16 Crore
2 GoTN share Rs. 8.07 Crore.
3 Incentive Fund under AMRUT Rs. 12.10 Crore.
4 ULB contribution Rs. 12.27 Crore
  Total Rs. 52.60 Crore

VII. Maintenance:

On completion, the scheme will be maintained by the Contractor for the period of 5 Years and after that the Scheme will be maintained by Rameswaram Municipality.

Present Stage:

The work order for the scheme has been issued on 08.09.2016 and work commenced on 01.12.2017 and the expenditure incurred is Rs.204.07 Lakhs( 4 %)

This Scheme is targeted for completion by 03/20..

Salient Details:

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