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Rough rule of thumb for calculating rainfall runoff volume on a catchment surface (English units):. You can collect 600 gallons of water per inch of rain The designer can calculate the annual water demand based on single or multiple uses that may be constant on a monthly basis, such as toilet/urinal flushing and To design a complex water harvesting system, you must first calculate monthly. “Supply” (rainfall harvest potential) and monthly “Demand” (plant water. The sizing of rainwater tank is based on the maximum volume of the water capture from the roof area to the rainwater harvesting system. The. Even though the "Rain Water Harvesting & Conservation" Manual has been compiled basically for the use in CPWD it may also be useful to a large number.There are a few numbers you need to calculate in order to implement a successful rainwater harvesting system. First, you need to know how much water you can