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Question
In a topographical map of a proposed reservoir, the area enclosed by contour lines is shown below
Contour (m)         Area enclosed (ha)
105                               100
110                               150
115                               350
120                               500
125                               900
The volume of impounded water using trape-zoidal formula will be
A.
5000 ha-m
B.
7500 ha-m
C.
8200 ha-m
D.
10000 ha-m
Answer ( Option B)

7500 ha-m

Solution

According to trapezoidal formula, volume i.e. V is

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