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→Drainage time (3D)Woods Ballard, B., S. Wilson, H. Udale-Clarke, S. Illman, T. Scott, R. Ahsley, and R. Kellagher. 2016. The SuDS Manual. 5th ed. CIRIA, London.
*''d<sub>r</sub>'' is the depth of the storage reservoir (m).}}
*''d<sub>r</sub>'' is the depth of the storage reservoir (m).}}
Note that narrow, linear bioretention features (or [[bioswales]]) drain faster than round or blocky footprint geometries (see above right figure).
Note that narrow, linear bioretention features (or [[bioswales]]) drain faster than round or blocky footprint geometries because they have larger perimeters (see above right figure).
===Groundwater mounding===
===Groundwater mounding===