Table 7 1 runoff coefficients for common roof materials metal 0 95 asphalt 0 90 concrete 0 90 tar and gravel 0 80 0 85 please note that the figures in table 7 1 are estimates. Divide 100 by the number of downspouts in order to obtain the percentage of water collected from each downspout. In a very light rain event the runoff coefficient can equal 0 00 since no rainwater will flow through your catchment system into your cistern.
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