Irrigation Engineering
Assertion A : To estimate the rainfall over a catchment, the number of raingauges required per unit area is large for hilly areas.Reason R : Rainfall gradient is steep.Select your correct answer according to the coding system given below :

Both A and R are true and R is the correct explanation of A
A is true but R is false
A is false but R is true
Both A and R are true but R is not the correct explanation of A

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Irrigation Engineering
As per Lacey’s theory, the silt factor is

inversely proportional to average par¬ticle size
directly proportional to average par¬ticle size
not related to average particle size
directly proportional to square root of average particle size

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