Wastewater facilities serving individual residences, commercial establishments, and small communities commonly rely on wastewater soil absorption systems (WSAS) where treatment and disposal is accomplished by infiltration of wastewater effluents into subsurface soils and recharge to local groundwater under the site. In these systems, understanding the infiltration rate (IR) behavior during operation and its progression to a long-term acceptance rate (LTAR) is critical to effective system design.
