The infiltration through shallow wells, shafts or pits is usually practiced to recharge a phreatic aquifer where spreading methods cannot be applied because of the existence of a low permeability surface layers. Often abandoned wells or pits are used that had previously fallen dry. The water fed into the structure will slowly replenish the aquifer. It is a cost effective method because recharge is governed by gravity flow only.
|Typical system capacity scale||Village – Town (≈104 m3/year – ≈106m3/year).|
|Geology||Unconfined aquifers composed of unconsolidated rocks where a surface low permeability layer is present.|
|Topography||Flat terrains may be associated with lower erosion and less clogging by sediments.|
|Soils||Not relevant for this kind of technology.|
|Water source||River water, lake water, treated wastewater, storm water.|
|Pre-treatment||Water treatment is recommended to prevent clogging and to comply with local groundwater regulations.|
|MAR main objective||Recover groundwater levels.|
|Relative cost||Low-Medium (existing infrastructure may be used to reduce costs).|
Advantages and disadvantages of the system (adapted from IGRAC, 2007):
- Existing facilities may be used to reduce costs of building new infrastructure.
- In the case of shallow wells, water recovery through the same structure reduces clogging.
- High water quality demands of source water.
- IGRAC. (2007). Artificial Recharge of Groundwater in the World.
- DEMEAU. (2014). Characterization of European managed aquifer recharge (MAR) sites – Analysis.