A 100-acre watershed that is 80% Industrial and 20% newly graded areas (no vegetation). The watershed has soil group B. Determine the runoff volume for 10-year, 24-hr rainfall event (use the IDF below)
A 100-acre watershed that is 80% Industrial and 20% newly graded areas (no vegetation). The watershed has soil group B. Determine the runoff volume for 10-year, 24-hr rainfall event (use the IDF below)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A 100-acre watershed that is 80% Industrial and 20% newly graded areas (no vegetation). The
watershed has soil group B. Determine the runoff volume for 10-year, 24-hr rainfall event (use
the IDF below)
RAINFALL INTENSITY IN INCHES PER HOUR
20.0
15.0
10.0
8.0
6.0
4.0
0.8
X
0.2
0.1
0.08
0.06
0.04
0.02
II
ப____
lud
6
VDOT B, D & E eqn.
except for 1-year
10
NOAA Atlas 14
Vienna/Tysons
for 1-year
15 20
MINUTES
30
RETURN
40 50 60
EN PERIOD (YEARS)
25
10
DURATION
NOAA Atlas 14
Vienna/Tysons
2
3
4 5 6
HOURS
8 10 12
18 24
-
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