What rainfall rate do I use?

Design storm data is defined by of the City of Longview Stormwater Manual for the Longview-Kelso urbanized area (see Appendix C).  Rainfall intensity for the 100-year storm is 0.26 inches per hour, and the total rainfall depth for the 100-year, 24-hour event is 6.17".

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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?