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 Also called interception wells, these are shallow wells which draw water from a natural aquifer outside of a riverbed, but which have a partial lining. They can be used to either drain a catchment area or recharge groundwater, especially where recharge of the aquifer is low due to low rock/soil permeability (the well penetrates through this).  Infiltration wells do not have to have a direct inlet (although they can have one). Without an inlet, they can become a larger hole and be filled with porous natural materials to increase the ground's infiltration capacity and, in most cases, have a coiled drain between the soil surface and the underground piping. This coiled drain is perforated to allow water inside where it can flow more quickly out of the drain. It acts as a security for high rainstorm runoff events that might rain too much water to effectively infiltrate into the well or aquifer.  Rocks, coarse wood chips or straw can be used as filtering material. Wells made of straw are constructed like permeable trenches and do not have a coiled drain, which can limit their infiltration capacity. Water extraction can be done with [[Handpumps]] or [[Small and efficient motor pumps]]. Handpump cylinders will need to physically be able to fit inside the screen that has been installed.