The population of township is around 1000. Entire Amba Township contains 100 acres. Entire Township is divided in five sector. But, currently analyzing only sector-3 (A, B). This sector holds various types of buildings 1RK, 1BHK, 2BHK, 3BHK, gym, library etc.
Housing units
Entire Amba Township Site layout
Rain water harvesting system:-
Catchment area
Coarse mesh / leaf screen
Conduits
Drainage network (Road network)
Percolation well
In Amba Township in sector-3 (A, B) there are presently 4 Percolation well. Which collect all surface water and store it into ground water. There are total 5 sector in Amba Township which also collect rain water through road network so all the water are flow into direction towards main percolation well. So that’s way ultimately main percolation well should be recharge.
Catchment area is the surface on which the rain Water falls. In this study all building’s roof and all roads are taken as catchment area. This water can be used for recharging ground aquifers after proper filtration.
Drainage Network is the network of road which can permit the easy flow of rain water.
In Amba Township all roads levels are maintained such that water can flow by gravity from higher elevation to lower elevation.
Water Demand:-
As per IS Specification (IS 1172: 1993), Total water demand for one person = 135 lit/day
Total water demand = 135*1000
Annually total water demand = 365*135*1000
Annually total water demand = 4, 92, 75, 000 lit
The water harvesting potential of site could be estimated using the following
equation:-
Rain Water harvesting potential = Amount of Rainfall * Area of catchment * Runoff coefficient
Rain Water harvesting potential = Amount of Rainfall * Area of catchment * Runoff coefficient
Rain water Harvesting by Terrace:-
Total Terrace Area of Sector-3 (A, B) A = 22011 Sq.m
Average Annual Rainfall in mm R = 740.3 mm
R = 0.740 m
Runoff co-efficient for a flat terrace C = 0.60
Annual water harvesting potential through total terrace
= A * R * C = 22011 * 0.740 * 0.60
= 9772.884 Cubic meter
= 97, 72,884 lit
Rain water Harvesting by Surface Drainage:-
Total Road Area of Sector-3(A, B) A = 8000 Sq.m
Average Annual Rainfall in mm R = 740.3 mm = 0.740 m
Runoff coefficient for a R.C.C road C = 0.82
Annual water harvesting through total Surface drainage = A * R * C
= 8000 * 0.740 * 0.82
= 4854.4 Cubic meter
= 48, 54,400 lit
Annually Total Rain water Harvesting:-
Annually Total Rain water Harvesting = Total Rain water harvesting + Total Rain Water harvesting
By Roof-top By Surface drainage
= (97, 72,884) + (48, 54,400)
Annually Total Rain water Harvesting = 1, 46, 27, 284 lit
which is 29.68% of total water demand. So by using
Rain water harvesting methods we can harvest and store the rain water into ground aquifer or into
percolation well.
Determining the No of Recharging structure :
No of Recharging Structure=
Total Road Area of Sector-3(A, B) A = 8000 Sq.m
Average Annual Rainfall in mm R = 740.3 mm = 0.740 m
Runoff coefficient for a R.C.C road C = 0.82
Recharge Structure = A * R * C*0.8
= 8000 * 0.740 * 0.82*0.8
= 3,883.52 Cubic meter
3883.52Cum =4000Cum
1 percolation pit for 1000Cum,
Hence 4 percolation wells are provided
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