Enviraj Consulting

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Rooftop Rainwater Harvesting Calculator

Rooftop RWH potential is estimated by multiplying the average annual rainfall, roof area and runoff coefficient. Runoff coefficient of the concrete roof is considered in the calculation which typically varies from 0.70-0.80. Fill the details below to calculate rainwater harvesting potential of your rooftop.

Select Your City
Enter Roof Area
Members in Family

Rainwater Harvesting Potential (Liters)

Water demand fulfilled (Months)

For more information on design of groundwater recharge sturctures, kindly follow this link