Infiltration refers to a method of collecting stormwater from rainwater pipes and surface water drains before directing it into a soakaway which then holds the water before allowing it to be dispersed back into the ground slowly over a period of time. 

Infiltration is the most common use for soakaway crates - particularly in a domestic setting. Infiltration is the preferred method of managing stormwater in permeable soils, particularly when it is not suitable to discharge the rainwater further downstream or where there is no suitable natural outlet nearby.