Changes

|''I''||m²||Impermeable area within the catchment

|''I''||m²||Impermeable area within the catchment

|-

|-

|''d<sub>T''||m||Depth of the infiltration BMP, total of all components

|''d''||m||Depth of the infiltration BMP, total of all components

|-

|-

|''A<sub>p''||m²||Permeable area i.e. footprint area of the infiltration BMP

|''A<sub>p''||m²||Permeable area i.e. footprint area of the infiltration BMP

The target [[drawdown time]] for the internal storage of an infiltration facility is typically between 48 and 72 hours. <br>

The target [[drawdown time]] for the internal storage of an infiltration facility is typically between 48 and 72 hours. <br>

For some geometries (e.g. particularly deep facilities or linear facilities), it preferable to account for lateral infiltration.  

For some geometries (e.g. particularly deep facilities or linear facilities), it preferable to account for lateral infiltration.  

The 3D equation make use of the hydraulic radius (''Ap''/''x''), where ''x'' is the perimeter (m) of the facility. <br>

The 3D equation make use of the hydraulic radius (''A<sub>p''/''x''), where ''x'' is the perimeter (m) of the facility. <br>

'''Maximizing the perimeter of the facility directs designers towards longer, linear shapes such as [[infiltration trenches]] and [[bioswales]].'''   

'''Maximizing the perimeter of the facility directs designers towards longer, linear shapes such as [[infiltration trenches]] and [[bioswales]].'''   

To calculate the time (''t'') to fully drain the facility:  

To calculate the time (''t'') to fully drain the facility: