The ordinates of a 6-h unit hydrograph are as given below: Time (h) 18 24 30 36 42 48 6 12 54 60 25 50 75 100 87.5 75 62.5 50 37.5 25 99 66 72 78 12.5 0 0 6-h UH ordinates (m3/s) Calculate the resulting hydrograph (flood hydrograph) due to storm of rainfall excess of 2 cm during the first 6 hours and 4 cm during the second 6 hours interval. The base flow can be assumed to be 25 m³/s constant throughout.

The ordinates of a 6-h unit hydrograph are as given below: Time (h) 18 24 30 36 42 48 6 12 54 60 25 50 75 100 87.5 75 62.5 50 37.5 25 99 66 72 78 12.5 0 0 6-h UH ordinates (m3/s) Calculate the resulting hydrograph (flood hydrograph) due to storm of rainfall excess of 2 cm during the first 6 hours and 4 cm during the second 6 hours interval. The base flow can be assumed to be 25 m³/s constant throughout.

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Unit Hydrograph

Hydrology is the science which deals with the study of water on the earth’s surface. The word Hydrograph is derived from the word hydro which means water. Hydrograph is basically a graph in which the discharge is plotted against the time interval at a specific point in a river or other channel. In a hydrograph, the discharge is plotted along the y-axis and time interval is plotted along the x-axis. Hydrograph is used to estimate the runoff. The variations in discharges with the change in time is shown by a hydrograph. It was revealed that the total discharge at an outlet increases with time by a kinematic wave model.

Question

6
The ordinates of a 6-h unit hydrograph are as given below:
Time (b)
6-h UH
12 18 24 30 36 42 48 54 60
75
25 50
100 87.5 75 62.5 50 37.5 25
72
66
72
78
12.5 0
0
ordinates (m3/s)
Calculate the resulting hydrograph (flood hydrograph) due to storm of rainfall excess of 2 cm
during the first 6 hours and 4 cm during the second 6 hours interval. The base flow can be assumed
to be 25 m³/s constant throughout.

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