A catchment has a runoff coefficient of 0.42, area = 85 ha with a general slope of 1 in 200 and maximum length of travel of overland flow of 1.8 km. Information on the storm of 25 years return period is given as follows: Duration (min) 15 Rainfall (mm) 40 Estimate the peak flow to be drained by a culvert for a 25 year storm Land use Roads Lawn Residential area Industrial area 30 60 Area (ha) If in the urban area of (a), the land use of the area and the corresponding runoff coefficients are as given below, estimate the new discharge. i = 2.78x155 2 80 000 170 000 45 500 000 100 000 -75 6.0 100 80 120 Runoff coefficient 0.70 0.10 0.30 0.80

A catchment has a runoff coefficient of 0.42, area = 85 ha with a general slope of 1 in 200 and maximum length of travel of overland flow of 1.8 km. Information on the storm of 25 years return period is given as follows: Duration (min) 15 Rainfall (mm) 40 Estimate the peak flow to be drained by a culvert for a 25 year storm Land use Roads Lawn Residential area Industrial area 30 60 Area (ha) If in the urban area of (a), the land use of the area and the corresponding runoff coefficients are as given below, estimate the new discharge. i = 2.78x155 2 80 000 170 000 45 500 000 100 000 -75 6.0 100 80 120 Runoff coefficient 0.70 0.10 0.30 0.80

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 catchment has a runoff coefficient of 0.42, area = 85 ha with a general slope of 1 in 200
and maximum length of travel of overland flow of 1.8 km. Information on the storm of 25 years
return period is given as follows:
T
Duration (min)
15
30
Rainfall (mm)
40
60
Estimate the peak flow to be drained by a culvert for a 25 year storm
Land use
Roads
Lawn
Residential area
Industrial area
If in the urban area of (a), the land use of the area and the corresponding runoff coefficients
are as given below, estimate the new discharge.
i = 2.78x105
Area (ha)
80000
45
-75
170 000
500 000
100 000
60
100
80
120
Runoff coefficient
0.70
0.10
0.30
0.80

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