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The design infiltration rate (''f''') is used in all sizing calculations for [[bioretention]] and [[bioswales]], [[dry ponds]], [[infiltration trenches]] and [[infiltration chambers|chambers]], and [[exfiltration trenches]]. It is related to, but not synonymous with 'permeability', 'field hydraulic conductivity' (''K<sub>fc</sub>''), or 'saturated hydraulic conductivity' (''K<sub>sat</sub>''). 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.
The design infiltration rate (''f''') is used in all sizing calculations for [[bioretention]] and [[bioswales]], [[dry ponds]], [[infiltration trenches]] and [[infiltration chambers|chambers]], and [[exfiltration trenches]]. It is related to, but not synonymous with 'permeability', 'field hydraulic conductivity' (''K<sub>fc</sub>''), or 'saturated hydraulic conductivity' (''K<sub>sat</sub>''). Before application a safety correction factor (''SCF'') is incorporated into the figure, depending upon the source of the raw data, and the risk of failure of the finished practice.
===Sources of data===
{{textbox|It is highly recommended that data are collected on site.}}