A watershed with approximately 480 acres has the time-area relationship between its sub-basins and the outlet as shown in Table 1. Direct runoff calculated using the Time-Area method for a rainfall event is given in Figure 1. The o index of 0.5 in/hr and a depression storage of 1 i: be assumed. Considering that the gross rainfall rate was always more than or equal to the in. 1/P rate, a) calculate and plot the excess rainfall hyetograph and the gross rainfall mass curve, and b) estimate the lag-time and the time of rise. 400 Table 1: Time-area relation 340 300 300 Time Area (hr) (ac) 70 200 1 200 180 200 105 3 180 100 3 4 5 Time interval (hr) Direct runoff (cfs)

A watershed with approximately 480 acres has the time-area relationship between its sub-basins and the outlet as shown in Table 1. Direct runoff calculated using the Time-Area method for a rainfall event is given in Figure 1. The o index of 0.5 in/hr and a depression storage of 1 i: be assumed. Considering that the gross rainfall rate was always more than or equal to the in. 1/P rate, a) calculate and plot the excess rainfall hyetograph and the gross rainfall mass curve, and b) estimate the lag-time and the time of rise. 400 Table 1: Time-area relation 340 300 300 Time Area (hr) (ac) 70 200 1 200 180 200 105 3 180 100 3 4 5 Time interval (hr) Direct runoff (cfs)

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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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

A watershed with approximately 480 acres has the time-area relationship between its sub-basins and
the outlet as shown in Table 1. Direct runoff calculated using the Time-Area method for a
rainfall event is given in Figure 1. The o index of 0.5 in/hr and a depression storage of 1 ir
be assumed. Considering that the gross rainfall rate was always more than or equal to the in.
1/P
rate,
a) calculate and plot the excess rainfall hyetograph and the gross rainfall mass curve, and
b) estimate the lag-time and the time of rise.
400
Table 1: Time-area relation
340
300
300
Time
Area
(hr)
(ас)
200
1
70
200
180
2
200
105
3
180
100
1
3
4
Time interval (hr)
Direct runoff (cfs)

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