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*''F<sub>c</sub>'' = The cleanout frequency (yrs)
*''F<sub>c</sub>'' = The cleanout frequency (yrs)
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Sediment loading rates from impervious surfaces studied by STEP were between 0.3 - 0.6 m³/ha/yr <ref>Goncalves, C., & Van Seters, T. (2012). Characterization of Particle Size Distributions of Runoff from High Impervious Urban Catchments in the Greater Toronto Area. Retrieved from https://sustainabletechnologies.ca/app/uploads/2013/03/PSD-2012-final.pdf</ref>. In Brisbane a value of 0.6 m³/ha/yr is the default value used to size small forebays <ref>Lal, R. (Ed.). (2006). “Particle Shape Effects” in “Particle Packing.” In Encyclopedia of Soil Science (p. 1248). New York: Taylor and Francis.</ref>.
2. The area of the forebay (''A<subf</sub>'') designed for 80 % capture efficiency (i.e. R = 0.8) may be calculated as:
2. The area of the forebay (''A<subf</sub>'') designed for 80 % capture efficiency (i.e. R = 0.8) may be calculated as: