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RAINWATER HARVESTING : A BASIC MANUAL FOR URBAN BUILT-UP AREAS by INTACH
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RAINWATER HARVESTING : 
A BASIC MANUAL FOR URBAN BUILT-UP AREAS 
by INTACH (Indian National Trust for Art & Cultural Heritage)

ROOFTOP WATER HARVESTING

Trapping of the rain water that is incident on the rooftop and other hard surfaces for utilisation during the lean season and recharging of the ground water through simple filtration devices.


A 60 CM ANNUAL RAINFALL ON A 100 SQ. M. OF HARD SURFACE YIELDS A WATER RUNOFF OF 40.000 LITRES SUFFICIENT FOR A PERIOD OF 3 MONTHS FOR A FAMILY OF 5 PERSONS 


RAINWATER RUN-OFF
The portion of the rainfall that does not seep into the ground or evaporates is available as rainwater run-off for harvesting.

RUN-OFF FACTOR (Rr) 
The proportion of the rainfall incident in an unit area that will be available as surface run-off.


ANNUAL RAINWATER HARVESTING POTENTIAL (ARHP)
The amount of water that shall be available from the campus house Industrial complex for harvesting annually is termed as the Annual Rainwater Harvesting Potential.



CALCULATING ANNUAL RAINWATER HARVESTING POTENTIAL


ARHP = R x Rf x A

where,

ARHP - Annual Rainwater Harvesting Potential (in cubic meters)
R - Annual rainfall (in mts.)
Rf - Run-off Co-efficient (%age)
A - Area (in sq. mts.)


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