Ultra-Drain Guard Oil & Sediment Standard Model - Part #9219 Stormwater Management This is necessary for the

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Ultra-Drain Guard Oil & Sediment Standard Model - Part #9219 Stormwater Management This is necessary for theFAQs Resources & Docs Compliance & Regs Additional Info. Frequently Asked Questions How much water can the Ultra Drain Guard handle? When new, the Ultra Drain Guard has a flow rate of 90 gpm ft2. However, the unit has been designed with overflow ports. These allow the Ultra Drain Guard a flow rate of 770 gpm which will prevent any flooding or ponding during extreme rain events. Any water that goes through the overflow is essentially untreated. How