(1) All conveyance systems shall be designed to at least accommodate the peak discharge from the 25-year, 24-hour design storm based on post-development site conditions, including stormwater flowing through the site which originates both on-site and off-site. This peak discharge flow shall remain within the conveyance system. Conveyance systems for new development or redevelopment projects that require full drainage plans shall be designed in accordance with SCC 30.63A.740.

(2) Road crossings and conveyance systems in fish-bearing waters shall be designed pursuant to SCC 30.62A.330(2)(d) and (e), as applicable. (Added by Amended Ord. 10-026, June 9, 2010, Eff date Sept. 30, 2010).