NCEES Civil PE Specification Hydraulics and Hydrology: Storm characteristics and runoff analysis (e.g., rational method)
Problem
A watershed, covering an area of 85 acres, is divided into five distinct land use classifications, as outlined in the table below. Intensity–duration–frequency curves have been derived from storm runoff data. Applying the Rational Method, what is the most approximate runoff discharge (in cubic feet per second) for a 20-year storm?
|
Region |
Area (acres) |
Land Use |
Time for Overland Flow (min) |
Rational Runoff Coefficient |
|
1 |
20 |
Residential: Single-family areas |
15 |
0.4 |
|
2 |
15 |
Playgrounds |
25 |
0.3 |
|
3 |
12 |
Streets (concrete) |
12 |
0.9 |
|
4 |
10 |
Parks |
20 |
0.2 |
|
5 |
28 |
Downtown areas |
30 |
0.9 |
Select an Answer:
