Runoff Coefficient Metal Roof

The other parameters are a the area of a watershed. 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. Green roofs are one of the most used green infrastructure measures to alleviate the pressure on the urban drainage system through the detention and retention of runoff.

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