The following table lists a streamflow hydrograph with a time interval of 10 minutes from a watershed, and the related storm occurred at time steps 3, 4 and 5 with the rainfall depths of 20 mm, 4 mm, and 11 mm, respectively. The ø-index is 30 mm/hr. (i) Use the straight- line method to separate the baseflow. (ii) Use the deconvolution method to derive and plot the 10-minute unit hydrograph. (iii) Calculate the watershed area and determine the time of concentration. Time step (10 minutes) 1 3 4 5 7 Discharge (m³/s) 1.85 1.73 5.48 9.68 8.87 5.39 4.58 2.63 2.51

The following table lists a streamflow hydrograph with a time interval of 10 minutes from a watershed, and the related storm occurred at time steps 3, 4 and 5 with the rainfall depths of 20 mm, 4 mm, and 11 mm, respectively. The ø-index is 30 mm/hr. (i) Use the straight- line method to separate the baseflow. (ii) Use the deconvolution method to derive and plot the 10-minute unit hydrograph. (iii) Calculate the watershed area and determine the time of concentration. Time step (10 minutes) 1 3 4 5 7 Discharge (m³/s) 1.85 1.73 5.48 9.68 8.87 5.39 4.58 2.63 2.51

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

The following table lists a streamflow hydrograph with a time interval of 10 minutes from
a watershed, and the related storm occurred at time steps 3, 4 and 5 with the rainfall depths
of 20 mm, 4 mm, and 11 mm, respectively. The ø-index is 30 mm/hr. (i) Use the straight-
line method to separate the baseflow. (ii) Use the deconvolution method to derive and plot
the 10-minute unit hydrograph. (iii) Calculate the watershed area and determine the time
of concentration.
Time step (10 minutes) 1
3
5
6.
7
8
9
2
4
Discharge (m³/s)
1.85
1.73 5.48
9.68 8.87
5.39
4.58 2.63 | 2.51

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