6. Groundwater Recharge

Groundwater recharge is a part of the hydrologic cycle; water moves downward through drainage or percolation from the water table to the saturated zone. In this process, water enters through an aquifer and encompasses water movement in the vadose zone. Groundwater recharges both naturally (i.e., hydrologic cycle) and artificially, as described in Chap. 2. In the managed aquifer recharge or artificial groundwater recharge, rainwater, or recycled water are considered to be routed into the subsurface. This chapter introduces the managed aquifer recharge, relevant technologies, and worldwide specific regulations and guidelines.  Thus, the possibilities and challenges of other technologies are incorporated in rainwater harvesting, stormwater, and greywater reuse to recharge aquifers are discussed in this chapter.