Storm water facilities shall be designed to store the excess flows from a post-development 100-year return interval storm of 24-hour duration. The release rate shall be that of a 10-year return interval storm of 24-hour duration on the site in its pre-developed state, or the capacity of the receiving stream, whichever is less. Under certain conditions it may be desirable to allow storm water runoff from a site without detention. This would be particularly germane for developments located immediately upstream from a channel obstruction that cannot be realistically removed.
(Ord. passed 10-11-2004)