Runoff Reduction Volume

08/06/25

“How do we classify the amount of stormwater runoff that can be captured and kept out of the stormwater system?”

Rain brings stormwater runoff. And when stormwater runoff is too large to control, it can lead to damaging flooding and pollution. But suppose systems, natural or human-made, are designed clever enough. In that case, they can capture some of this stormwater and prevent it from entering stormwater handling infrastructure through absorption, infiltration, evaporation, or reuse. Whatever amount of stormwater is handled through this manner is classified as Runoff Reduction Volume. Interventions like rain gardens and bioswales can increase the expected runoff reduction volume.