Answered: Determine the time of concentration for…

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

Determine the time of concentration for use in the NRCS method for a drainage basin located in
Hardin County, Ohio having the hydraulic path described below:
Overland
 Average Grass
 L = 100’
 S = 1.6%
 n = 0.24
Shallow Concentrated
 L = 680’
 S = 3.2%
Stream Flow
 L = 2950’
 S = 0.61%
 Cross Section
o B = 12’
o T = 20’
o y = 4’
o n = 0.035

COUNTY 2-yr ; 5-yr ; 10-yr ; 25-yr ; 50-yr ; 100-yr

HARDIN 2.5 ; 3.0 ; 3.5 ; 4.2 ; 4.7 ; 5.3

0.40
45
200
B
60 -
-
1
1
1
1
1
-2
A
PER
10
50
∞
6
4
Time of concentration (tc), hours
.8
1
9°
b
.2
I'
Unit peak discharge (qu), csm/in
FIGURE D-5. (CHART 3) Unit peak discharge (qu) for NRCS type II rainfall distribution. (Courtesy of
Soil Conservation Service, Technical Release 55.)

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