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C = Runoff coefficient to reflect the ratio of rainfall to surface runoff factors, including the storage of water in surface depressions, infiltration. These are based on the Rational Method which simply multiplies the catchment area by the rainfall intensity, modified by the runoff coefficient. Each method. EPA's National Stormwater Calculator (SWC) is a software application tool that estimates the annual amount of rainwater and frequency of runoff from a.

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Calculate the depth of water that will drain out over 24 hours. 3. Determine total impervious surface area to drain to rain garden: House Roof (Front). 14 ft. x. Take the area of your roof number x inches of rain per year (Bothell is around 36 inches) x =gallons per year · Imagine all that water rushing off of your. First, calculate the square foot of all hard, impervious surfaces such as driveways, sidewalks, and other roofed or concrete areas that do not allow water.

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Selection of the appropriate method of calculating runoff should be based upon the includes water retained in surface depressions, water intercepted by. The Clean Water Team Guidance Compendium for Watershed Monitoring and Assessment The runoff coefficient (C) is a dimensionless coefficient relating the. The surface overland flow runoff rate, R, is the excess surface water input that does not infiltrate. This is also often referred to as precipitation excess or.