Question

Field capacity of a ground aquifer equals _________

(a) specific yield

(b) 100 – specific yield

(c) 100/ specific yield

(d) field capacity

I have been asked this question in class test.

The doubt is from Aquifers and Their Type-1 in division Ground Water for Irrigation through Wells and Tubewells of Irrigation Engineering

Answer 1

The correct answer is (b) 100 – specific yield

The explanation is: Field capacity can be expressed as the percentage of the total volume of the material drained. Specific retention or field capacity is given as –

F.C = volume of water held against gravity drainage/total volume of the material drained x 100

The summation of Specific yield and field capacity is equal to the porosity.