What detention volume is required?

The required detention volume is based on the different in runoff volume generated during the pre-developed and post-developed condition for the 100 year, 24 hour event. Participants wanting to purchase regional detention capacity should submit a stormwater report, signed and dated by an engineer licensed in Washington state, or other licensed professionals if appropriate.

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1. How much does it cost to buy regional detention?
2. What detention volume is required?
3. Is everyone eligible to buy regional detention?
4. How much capacity is available?
5. What rainfall rate do I use?