How do I apply the required hydrologic length in a Lag Method time of concentration computation for a roadway surface having a closed drainage system? Example: Drainage area A is a 300 ft. long x 12 ft. wide, paved, curbed area sloping to a catch basin. The cross slope is 2% and the longitudinal slope 1%. Is he hydrologic length just centerline to gutter line (20 l.f.±) or does it include the 300 ft. of gutter flow? The resulting times are drastically different - < 1 min. or 7 min.± depending on the length used. Know of any on-line articles on this?
Thanks in advance.
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