As nouns the difference between infiltration and percolation is that infiltration is the act or process of infiltrating, as of water into a porous substance, or of a fluid into the cells of an organ or part of the body while percolation is the seepage or filtration of a liquid through a porous substance. Infiltration is defined as the downward entry of water into the soil or rock surface (SSSA, 1975) and percolation is the flow of water through soil and porous or fractured rock. Infiltration and percolation are two related but different processes describing the movement of moisture through soil. The main difference is that infiltration is the process of filtration of rainwater while percolation is the process of filtration of infiltered water through soil … While percolation is the flow of water through soil or porous rocks. SUBJECT: INFILTRATION TESTING USING PERCOLATION TEST METHOD DATE: JANUARY 9, 2017 OVERVIEW: Because of the increasing need to decrease off-sitestormwater flows from new and re-development sites, infiltration into the on-sitesoils is becoming a common alternative to stormwater collection and detention facilities. Infiltration and percolation are two different processes related to the movement of water or moisture through the soil. The key difference between infiltration and percolation is that the infiltration refers to the filtration of rainwater from the surface of the ground while percolation refers to the filtration of infiltered water through soil particles and porous materials such as fractured rocks etc. Infiltration is the downward movement of water into soil or rocks surface. In hydrologic modeling, these two processes are usually modeled separately.