(a) (b)
Figure 1 (a) West Bengal map (colour) in India and (b) Bankura district in West Bengal
In the present study average specific yield of Bankura district is taken as 8%. Because, 52% of area is covered with alluvium system and 48% of area covered with remaining systems. From the table, lower specific yield value of alluvium system is considered as average specific yield of the study.