Example 2.2 A catchment has eight rain gauge stations. The annual rainfall recordedby these gauges in a given year are as listed in column 2 of the following Table.ITable for computation of (P₁-P) (Example 2.2)Rain GaugeAnnual Rainfall (cm)P₁-P(P₁-P1030.41A80.8- 32.1B87.6- 25.3640.09C102.0- 10.9118.81D160.847.92294.41E120.47.556.25F110.8-2.14.41G142.329.4864.36H98.5- 14.4207.36Total903.20.05216.10What should be the minimum number of the raingauges in the catchment for estimatingthe mean rainfall with an error of less than 7% ?

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What should be the minimum number of the raingauges in the catchment for estimating the mean rainfall with an error of less than 7% ?

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

Example 2.2 A catchment has eight rain gauge stations. The annual rainfall recorded
by these gauges in a given year are as listed in column 2 of the following Table.
I
Table for computation of (P₁-P) (Example 2.2)
Rain Gauge
Annual Rainfall (cm)
P₁-P
(P₁-P
1030.41
A
80.8
- 32.1
B
87.6
- 25.3
640.09
C
102.0
- 10.9
118.81
D
160.8
47.9
2294.41
E
120.4
7.5
56.25
F
110.8
-2.1
4.41
G
142.3
29.4
864.36
H
98.5
- 14.4
207.36
Total
903.2
0.0
5216.10
What should be the minimum number of the raingauges in the catchment for estimating
the mean rainfall with an error of less than 7% ?

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