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Global Inventory of Artificial Recharge
In-channel modifications
In-channel modifications are structures that intercept or detain the stream flow through a natural drainage channel, and enhance the natural groundwater recharge. In-channel modifications are amongst the oldest AR techniques in existence. Dams built of stone rubble, dating back as far as the 3rd millennium B.C. have been discovered in Baluchistan and Kutch in India. In-channel modifications are predominantly used in arid regions, built across streams and sandy riverbeds that are seasonally dry. Generally, the purpose is to enhance groundwater recharge by storage of flood events and a controlled release, in order to facilitate its infiltration to the subsurface. A variety of in-channel structures are applied throughout the world: