Where:
| ||||
Q
|
=
|
Peak runoff rate, in cubic feet per second (cfs).
| ||
C
|
=
|
Runoff coefficient equal to the ratio of the runoff rate to
the average rate of rainfall over a time period equal to the time
of concentration.
| ||
I
|
=
|
Average rainfall intensity in inches per hour for a time equivalent
to the time of concentration.
| ||
A
|
=
|
Drainage area in acres.
|
Approximate values for the runoff coefficient and runoff intensity
are found in the following sources:
|
Commonwealth of Pennsylvania
| |
---|---|
Department of Transportation
| |
Design Manual, Part 2
| |
Chapter 12
|