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===Sizing and Modelling===
===Sizing and Modelling===
Bioretention facilities should be sized to accommodate runoff from approximately 10 to 20 times the footprint area of the facility. i.e. I/P ratio of 10 to 20.
Bioretention facilities should be sized to accommodate runoff from approximately 10 to 20 times the footprint area of the facility. i.e. they should have an I/P ratio of 10 to 20.
When the drainage area is too large, silt can accumulate very rapidly, overwhelm the [[pretreatment]] devices, and lead to clogging of the facility.
When the drainage area is too large, silt can accumulate very rapidly, overwhelm the [[pretreatment]] devices, and lead to clogging of the facility.
When the drainage area is relatively small compared to a bioretention facility, it can make the facility appear unreasonably costly.
When the drainage area is relatively small compared to a bioretention facility, it can make the facility appear unreasonably costly.