Some Studies on Hydrologic Parameters of Groundwater Recharge in Andhra Pradesh

Broad correlation is recognized between infiltration characteristics and basin yields. Rainfall infiltration factor has been estimated by different methods for different soil groups and topographic characteristics, as ranging from 5 per cent in predominantly hilly catchments to as much as 40 per cent in plain sandy catchments. Infiltration from applied irrigation also constitutes one of the major sources of groundwater recharge, and is found to vary from 30 per cent to over 80 per cent depending on depth of water table and soil characteristics. A linear relationship between the paddy field infiltration ratio and the logarithm of uniformity coefficient of soil is inferred from the studies. The infiltration from tanks is estimated to range from 2 to 114 mm per day.