Drainage areas are determined by tracing all of the water bodies flowing into the stream or river upstream of the proposed site. A divide or ridge surrounds every drainage basin. A divide is defined as “the line of separation or dividing ridge marking the boundary between two drainage systems.”
Q. How do you calculate drainage rate?
To do this, we simply multiply across each row. The runoff, Q, for the roof area in drainage Zone A is: (1.00 x 1.5 x 500) / 96.23 = 7.79 gallons per minute. The runoff for the grass portion of drainage Zone A is: (0.35 x 1.5 x 900) / 96.23 = 4.91 gpm.
Table of Contents
Q. How do you calculate surface water drainage?
Surface Water
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