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What is the difference between the runoff from 1 inch of rainfall and a half-inch of runoff?

April 26, 2017half-inch inch rainfall Runoff

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What is the difference between the runoff from 1 inch of rainfall and a half-inch of runoff?

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The treatment volume required for retention, exfiltration, underdrain and dry detention with effluent filtration (sand filter) systems is the greater of a half-inch of runoff or 1 inch of rainfall over the watershed contributing to the system.