Natural groundwater recharge
In natural recharge, rainwater enters the soil
through voids through natural processes. About 15–20% of seasonal rainfall
contributes to groundwater recharge in the region with higher permeability,
while that falls to about 5–10% in the hard-rock regions. Sandy or permeable
soil, rocky strata with fractures, perennial rivers and streams, forest land,
paddy field, wetlands, and leveled lands are the most suitable natural
condition for GW recharge. Application of additional irrigation @ 50 mm in each
time over and above the normal irrigation is easily moved to the downstream and
recharges the groundwater.