Fischer Park has rain gardens at each of its main parking lots. Several rain gardens throughout an area are better than one. Bioswales along the parking areas at Fischer Park have been designed, installed, and lined with plants to absorb runoff water. During heavy rains, excess water is directed into the bioswales which filters slowly and absorbs into the ground. This also helps recharge groundwater, supplying rivers and streams with a steady, purified water source.

The plants selected for the rain garden and bioswale are able to withstand the extremes of both flooding and drought. Deep-rooted native plants are ideal for rain gardens and bioswales because they encourage infiltration, filter pollutants, and control erosion. Native plants are well adapted to climate and resist local pests and diseases. The selection of the right plants is crucial to the overall success of the garden.