A 100-acre watershed that is 80% Industrial and 20% newly graded areas (no vegetation). Thewatershed has soil group B. Determine the runoff volume for 10-year, 24-hr rainfall event (usethe IDF below)RAINFALL INTENSITY IN INCHES PER HOUR20.015.010.08.06.04.00.8X0.20.10.080.060.040.02IIப____lud6VDOT B, D & E eqn.except for 1-year10NOAA Atlas 14Vienna/Tysonsfor 1-year15 20MINUTES30RETURN40 50 60EN PERIOD (YEARS)2510DURATIONNOAA Atlas 14Vienna/Tysons234 5 6HOURS8 10 1218 24-

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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)

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

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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1.Determine the weighted curve numbers for a watershed with 40 percent residential (1/4-acre lots), 25 percent open space, good condition, 20 percent commercial business (85 percent impervious), and 15 percent industrial (72 percent impervious), with corresponding soil groups of C,D, C, and D. If the watershed experienced a rainfall of 6in, what is the runoff volume?
The surface runoff hydrograph after the base flow separation is called: * None of the these Direct Runoff Hydrograph (DRH) Base Flow (BF) Discharge (Q) Unit Hydrograph (UH) The total rainfall in a catchment of area 1200 Km2 during a 6-hr storm is 16 cm. The surface runoff is 1.2 *10^8 m3. The infiltration index is: * 1.2 cm/hr 0.1 cm/hr 1 cm/hr cannot be estimated with the given data 0.2 cm/hr