Design infiltration rate
The design infiltration rateThe rate at which stormwater percolates into the subsoil measured in inches per hour. (f') is used in all sizing calculations for bioretention and bioswales, dry ponds, infiltration trenches and chambers, and exfiltration trenches. It is related to, but not synonymous with 'permeability', 'field hydraulic conductivityA parameter that describes the capability of a medium to transmit water.' (Kfc), or 'saturated hydraulic conductivityA parameter that describes the capability of a medium to transmit water.' (Ksat). Before application a safety correction factor (SCF) is also incorporated depending upon the source of the raw data and the risk of failure of the finished practice.