Determine the time of concentration for use in the Rational Method for a drainage basin having the hydraulic path described below:Overland Average Grass L = 80’ S = 2.5%Shallow Conc. L = 450’ S = 4.8%Gutter Flow L = 200’ S = 1.9% LENGTH OF STRIP IN FEETOVERLAND FLOW CHART-1000- 900800700- 600- 2009080706050403020100.900.650.500.30COEFFICIENT OF RUNOFF "C"TURNING LINE000GWNос1.02.0 -5.010201101-1REFERENCE SECTIONPERCENT SLOPE1101.2.2MLO30NLO20158()CONCENTRATION TIME IN MINUTES Watercourse slope, ft/ft.50.20.10.06.04.02.01.0058PASINDAMAZASID1111UnpavedPaved12}14101206Average velocity, ft/secFIGURE 10-9 Average velocities for estimating travel time for shallow concentrated flow. (Courtesyof Soil Conservation Service, Technical Release 55.)

Average Grass Overland flow length, L = 80’ Slope, S = 2.5% Shallow Conc. L = 450’ S = 4.8%…

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 Rational Method for a drainage basin having
the hydraulic path described below:
Overland
 Average Grass
 L = 80’
 S = 2.5%
Shallow Conc.
 L = 450’
 S = 4.8%
Gutter Flow
 L = 200’
 S = 1.9%

LENGTH OF STRIP IN FEET
OVERLAND FLOW CHART
-1000
- 900
800
700
- 600
- 200
90
80
70
60
50
40
30
20
10
0.90
0.65
0.50
0.30
COEFFICIENT OF RUNOFF "C"
TURNING LINE
000
GWN
ос
1.0
2.0 -
5.0
10
20
1101-1
REFERENCE SECTION
PERCENT SLOPE
1101.2.2
M
LO
30
N
LO
20
15
8
()
CONCENTRATION TIME IN MINUTES

Watercourse slope, ft/ft
.50
.20
.10
.06
.04
.02
.01
.005
8
PA
SIND
AMAZ
A
SID
1
1
1
1
Unpaved
Paved
1
2
}
1
4
10
1
20
6
Average velocity, ft/sec
FIGURE 10-9 Average velocities for estimating travel time for shallow concentrated flow. (Courtesy
of Soil Conservation Service, Technical Release 55.)

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