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[[Image:infiltration wells.png|right|80px]]

[[Image:InfiltrationWell.JPG|thumb|right|200px|Infiltration well in Madagascar. Eric Fewster, BushProof.]]

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.