By the Grace of mother nature and co-operation
from Civic authorities as well as the general public, Siruthuli has already reclaimed most of the urban water bodies in
our city. This activity has shown a substantial increase
in water table in all the areas.7 tanks of 808 acres tank bed area have been desilted and can now store 229 M.Cu.ft of water.
Details of the tanks desilted /
standardized by Siruthuli
Name
of the tank
Length
of the
bund(in meters)
Total tank bed area (in
acres)
Desilted/deepened tank bed area
(in acres)
Capacity
(inM.cu
ft.)
Krishnampathy
2600
175.93
55.71
7.658
Narasampathy
3200
124.05
114.25
59.711
Selvampathy
2300
69.92
50.05
9.916
Kumarasamy
2400
93.90
75.05
19.868
Selvachinthamani
1800
36.82
20.00
2.929
Kurichi
Kulam
3946
343.96
193.00
59.918
Coimbatore
big tank
2000
320.00
300.00
69.501
Total
18246
1164.58
808.06
229.501
Click
for Enlarged View
Roadside Rain Water Harvesting Structures (RWHS) A Report
With the help of the Coimbatore Corporation, 150 deep borewells with recharge pits and percolation / filter chambers were
constructed to harvest the rainwater from roads/ open space of Coimbatore city. The past rains have proved the efficacy
of these pits in preventing flooding, water stagnation and recharging ground water. Water levels and water samples have been
collected periodically to study the fluctuations in ground water levels and the water quality. This study will be carried out once
in three months which will help as to arrive a best possible ways of safe rainwater harvesting from road side and open spaces
within the city.
Coimbatore Corporation has awarded a contract for constructing rainwater harvesting structures as below:
South zone and West Zone – Value of works Rs.20 lacs
North zone and East Zone – Value of works Rs.20 lacs
So far 150 borewells have been drilled and rainwater-harvesting structures are constructed from 2005 as below:
Zone
No. of RWHS
North
37
East
37
West
39
South
37
Total
150
Impact of RWHS:
The data collected from a local established drilling company reveals the following facts which proves the worthiness of the project implemented.
The average Static water level, yield and cost of drilling in Coimbatore city for 3 years is given in the following table
4½ inches Borewell
6½ inches Borewell
Year
Static water level in ft
Yield in inches
Cost of drilling in Rs.
Static water level in ft
Yield in inches
Cost of drilling in Rs.
2003
90
1.5
8675
90
1.5
17028
2004
122
1.3
11250
131
1.3
23222
2005
63
1.97
6285
63
2.0
14166
Observatory borewells:
Out of 150 RWHS constructed, 20 numbers were selected throughout the city in order to observe the water levels and quality of the
borewells.
The above data in the table collected from M/s. Sapthagiri borewells is being confirmed by our recent data
collected from 20 observatory borewells selected out of 150 borewells drilled for rainwater recharge purpose during February 2006.
The water samples collected from the observatory borewells were tested and found that 9 borewells have Potable water and 11 numbers have Non-Potable water.
Solid Waste Management- Waste To Wealth Removal of water hyacinth and garbage
Valankulam and Selvachintamani tanks are covered with water hyacinth mainly due to the sewage water contamination.
Water hyacinth has been proved to be an ideal breeding for mosquitoes and since it has 80 % water content, it is also a
potential threat for depletion of water level in the tank. Siruthuli in its endeavour to preserve the water in these tanks, undertook the massive project of removing the water hyacinth
from them. The water hyacinth thus removed, from Valankulam, Selvachinthamani, Periyakulam and Krishnampathy tanks were
processed as manure using EM Technology. The manure obtained from the water hyacinth was tested and proved as a best bio-manure
for agricultural crops.
The Coimbatore Corporation, like other Municipal Corporations, has also commenced segregation of waste at source in South Zone.
It is reported that about 600 M.T of garbage is being generated daily in Coimbatore Corporation. Out of the 600 M.T solid waste generated daily,
the Corporation authorities assured of supplying 100 M.T. of organic market/hotel waste daily to Siruthuli for processing the
bio-degradable waste into bio-compost using EM Technology. Siruthuli will take up 100 M.T processing of waste in a phased manner.
