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Question
Under the same conditions which one of the following is most suitable for using isohyetal method to evaluate mean aerial depth of rainfall?
leku ifjfLFkfr;ksa esa o"kkZ dh vkSlr gokbZ xgjkbZ dk ewY;kadu djus ds fy, vkblksgkbVy fof/k dk mi;ksx djus ds fy, fuEufyf[kr esa ls dkSu lk lcls mi;qDr gS
A.
Plain country
B.
Gently sloping basin    
C.
Undulating country
D.
A place where the precipitation includes snow-melt
Answer ( Option B)

Gently sloping basin    

Solution

Isohyetal lines are based on interpolation between raingauge stations. While constructing isohyets, it is assumed that rainfall between two stations vary linearly, unless abrupt changes in topography indicate otherwise, so a gentle slope is most suitable.

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