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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 are useful 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 form 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. 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.