Section 4: Soil and Water Conservation Engineering
Hydrology
Subtopic: Meteorological parameters and their measurement
Question Statement:
Three catchments A, M and F each having an area of 10,000 km² are situated in an arid zone, mountainous region of a temperate zone and flat region of a temperate zone respectively. The desirable number of hydrometeorological stations for these three catchments, N_A, N_M and N_F respectively will be such that
Options:
(A) N_M>N_F>N_A
(B) N_A<N_M<N_F
(C) N_A>N_M>N_F
(D) N_M=N_F and N_M>N_A
Official Answer Key:
A
Step-by-Step Solution & Explanation
WMO minimum network density guidance: mountainous/rugged terrain (rainfall highly variable spatially) needs the densest network, followed by flat temperate terrain, while arid zones (low, infrequent rainfall) need the sparsest network. Hence N_M > N_F > N_A.
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