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Roof Top Rainwater Harvesting:

In urban areas, the roof top rain water can be conserved and used for recharge of ground water. This approach requires connecting the outlets pipe from roof top to divert the water to either existing well/tube wells/borewells or specially designed wells/ structures. The Urban housing complexes or Institutional buildings have large roof area and can be utilized for harvesting the roop top rain water to recharge aquifer in Urban areas. Table shows the availability of rain water through Roof Top Rain Water Harvesting.

Roof top area (Sq.m)

Rain fall (mm)

100
200
300
400
500
600
800
1000
1200
1400
1600
1800
2000
HARVESTED WATER FROM ROOF TOP (Cum)
20
1.6
3.2
4.8
6.4
8
9.6
12.8
16
19.2
22.4
25.6
28.8
32
30
2.4
4.8
7.2
9.6
12
14.4
19.2
24
28.8
33.6
38.4
43.2
48
40
3.2
6.4
9.6
12.8
16
19.2
25.6
32
38.4
44.8
51.2
57.6
64
50
4
8
12
16
20
24
32
40
48
56
64
72
80
60
4.8
9.6
14.4
19.2
24
28.8
38.4
48
57.6
67.2
76.8
86.4
96
70
5.6
11.2
16.8
22.4
28
33.6
44.8
56
67.2
78.4
89.6
100.8
112
80
6.4
12.8
19.2
25.6
32
38.4
51.2
64
76.8
89.6
102.4
115.2
128
90
7.2
14.4
21.6
28.8
36
43.2
57.6
72
86.4
100.8
115.2
129.6
144
100
8
16
24
32
40
48
64
80
96
112
128
144
160
150
12
24
36
48
60
72
96
120
144
168
192
216
240
200
16
32
48
64
80
96
128
160
192
224
256
288
320
250
20
40
60
80
100
120
160
200
240
280
320
360
400
300
24
48
72
96
120
144
192
240
288
336
384
432
480
400
32
64
96
128
160
192
256
320
384
448
512
576
640
500
40
80
120
160
200
240
320
400
480
560
640
720
800
1000
80
160
240
320
400
480
640
800
960
1120
1280
1440
1600
2000
160
320
480
640
800
960
1280
1600
1920
2240
2560
2880
3200
3000
240
480
720
960
1200
1440
1920
2400
2880
3360
3840
4320
4800
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