A bioswale is a carefully constructed arrangement of native plants along a road that mitigates flooding and reduces road run off pollution.
Bioswales are key to alleviating flooding on public roads. Including them as part of an urban or suburban street will significantly reduce stormwater. In this era of increasingly heavy rains, any green infastructure that improves flooding is key.
Bioswale usually has a grade change involved where water collects through runoff during storms. So the land around it is higher than the actual swale. And bioswales aren’t necessarily adjacent to bodies of water whereas buffers are. Bioswales are being used now in parking lots to accept the run-off water from the lots and filter it before it reaches the ground water. Bioswale is about slowing down and filtering water before it hits ground water or a surface water body.