Iowa Stormwater Education Program


Bioswales are installed as an alternative to underground storm sewers and consist of permeable soil, a perforated subdrain, and subtle earthen berms. The bioswale is engineered so runoff from a 1.25" rain infiltrates through tile into the soil below. 
Bioswales differ from biocells in that they are implemented on sloped areas so that when larger storms occur, the above ground vegetation slows the flow of runoff, which is filtered and cleaned before draining into the nearest stream or waterbody. It is critical that bioswales are inspected and maintained periodically to ensure their continued performance.
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