A. Balanced and critical drainage basins are watersheds that have been identified by the chief engineer as unsuitable for increased development because of the high probability of increased flooding with development and the potential for flooding of existing improvements or property. Critical and balanced basins may be developed further only upon the incorporation of adequate detention systems or flood control facilities, as reviewed and approved by the chief engineer. Drainage basins that have not previously been identified as unsuitable for additional urban development, shall be considered to be balanced basins, but upon study by the chief engineer, may be subject to the critical basin provisions of this chapter. These detention systems or flood control facilities shall be incorporated into any and all future basin-development proposals, regardless of size or land-use density, unless fees in lieu of detention are proposed pursuant to Section 16.48.040 and approved by the chief engineer.
B. Retention of storm water is not allowed without demonstrating that, over the long-term, the ponded waters will not cause a nuisance or a vector problem. In lieu of threshold retention, county requirements will be based upon additional detention requirements based on the guidance provided in the Storm Water Detention/Retention Manual.
(Ord. 2010-FC5 § 1 (part), 2010; Ord. 2005 FC-2 § 2 (part), 2005; Ord. 1999 FC-1 § 1 (part), 1999; Ord. 1988 FC-2 Art. 14 (A), 1988).