EXERCISE: LAND USE CHANGE ON WATER QUANTITY a. Figure Q1 shows hydrograph generated during rainfall event from an urban area with 90% of impervious surface. The urban area always experiencing flash flood. This issue always being discussed by the local authority. As the engineer in the local authority, you are responsible to solve this issue. One of the solutions proposed is to reduce the percentage of impervious surface to only 60%. i. Discuss in detail, the impact of reducing the percentage of impervious surface will affect the peak discharge (Qp), time to peak discharge (tp) and total discharge (Qt) of the hydrograph. ii. Sketch the new hydrograph in Figure Q1. Discharge 10 8 6 4 2 0 1 2 3 Time Figure Q1: Hydrograph during 90% of impervious surface
EXERCISE: LAND USE CHANGE ON WATER QUANTITY a. Figure Q1 shows hydrograph generated during rainfall event from an urban area with 90% of impervious surface. The urban area always experiencing flash flood. This issue always being discussed by the local authority. As the engineer in the local authority, you are responsible to solve this issue. One of the solutions proposed is to reduce the percentage of impervious surface to only 60%. i. Discuss in detail, the impact of reducing the percentage of impervious surface will affect the peak discharge (Qp), time to peak discharge (tp) and total discharge (Qt) of the hydrograph. ii. Sketch the new hydrograph in Figure Q1. Discharge 10 8 6 4 2 0 1 2 3 Time Figure Q1: Hydrograph during 90% of impervious surface
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter7: Seepage
Section: Chapter Questions
Problem 7.6P
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Transcribed Image Text:EXERCISE: LAND USE CHANGE ON WATER QUANTITY
a.
Figure Q1 shows hydrograph generated during rainfall event from an urban area
with 90% of impervious surface. The urban area always experiencing flash
flood. This issue always being discussed by the local authority. As the engineer in
the local authority, you are responsible to solve this issue. One of the solutions
proposed is to reduce the percentage of impervious surface to only 60%.
i. Discuss in detail, the impact of reducing the percentage of impervious
surface will affect the peak discharge (Qp), time to peak discharge (tp)
and total discharge (Qt) of the hydrograph.
ii. Sketch the new hydrograph in Figure Q1.
Discharge
10
8
6
4
2
0
1
2
3
Time
Figure Q1: Hydrograph during 90% of impervious surface
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