Unified Stormwater Sizing Criteria

• Runoff Reduction *

• Groundwater Recharge Criteria *

• Water Quality Criteria

• Channel Protection Criteria

• Overbank Flood Control Criteria

• Extreme Flood Criteria *

* can be at least partially fulfilled by better site design practices

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The six criteria comprising the unified approach include: reduce runoff, maintain groundwater recharge, meet pollutant removal goals, reduce channel erosion, provide overbank flood control, and pass extreme floods. It is important to note that often multiple criteria can be met with one treatment practice.