Notation

From LID SWM Planning and Design Guide
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q
infiltration rateThe rate at which stormwater percolates into the subsoil measured in inches per hour. in units of length per time. (before or after application of safety factor?)
SCF
Safety correction factor (dimensionless)
Ra
Existing rise of swaleA shallow constructed channel, often grass-lined, which is used as an alternative to curb and channel, or as a pretreatment to other measures. Swales are generally characterized by a broad top width to depth ratio and gentle grades. gradient