1. Estimate the peak flow rate assuming that the runoff coefficient is 0.4. 2. If the land use and the corresponding percentage of the area and runoff coefficients are as given below, calculate the equivalent runoff coefficient. % of

1. Estimate the peak flow rate assuming that the runoff coefficient is 0.4. 2. If the land use and the corresponding percentage of the area and runoff coefficients are as given below, calculate the equivalent runoff coefficient. % of

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

An agricultural catchment area of a town in Egaro is 65 ha. Average slope is calculated as 0.6%. Water travels with a maximum length of 700 m. The depth-duration
relationship for a 10-year return period on the site is given below:
Duration (m)
5
10
20
30
40
60
Depth of rainfall (mm)
17
26
40
50
57
62
1. Estimate the peak flow rate assuming that the runoff coefficient is 0.4.
2. If the land use and the corresponding percentage of the area and runoff coefficients are as given below, calculate the equivalent runoff coefficient.
% of
Runoff coefficient
Area
Land use
Roads
0.7
Lawn
20 0.1
Residential area
59 0.3
Industrial area
12 0.8
NB Report your answers in three significant digits.

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