Aquifer storage transfer and recovery (ASTR) Injection of water into a well for storage and Recovery from a different well, generally to provide additional water treatment.

Artificial recharge (AR) Intentional banking and treatment of water in aquifers.

Artificial Recharge and Recovery (ARR) Recharge to and recovery of water from an aquifer, that is, both artificial recharge of the aquifer and recovery of the water for subsequent use.

AT Acoustic televiewer.

Augmentation pond Water body designed to supply water to river systems at defined rates during particular times.

Bank filtration Extraction of groundwater from a well or caisson near or under a river or lake to induce infiltration from the surface water body, thereby improving and making more consistent the quality of water recovered.

Base flow That portion of a stream’s flow derived from ground water (as opposed to surface runoff and interflow).

Basin (1) Hydrology: The area drained by a river and its tributaries. (2) Irrigation: A level plot or field, surrounded by dikes, which may be flood irrigated. (3) Runoff control: A catchment constructed to contain and slow runoff to permit the settling and collection of soil material transported by overland and rill runoff flows

Basins and watersheds Areas of drainage in which all collected water ultimately drains through a single exit point. Basins differ from watersheds only in the perception of their size: basins are usually considered to be much larger, composed of many watersheds. Within a watershed or basin, water moves both on and below the surface. Topographic “highs” prevent surface water from crossing from one watershed (aquifer) to another.

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