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Drainage Zones

Click on the Map above for a larger file and links to individual zone maps

Drainage Zones / Flood Control Districts (blue shaded areas on map above) have been established based upon defined watersheds within urban areas. Permit applications for projects located within a drainage zone are assessed an impervious area fee based upon the increase in impervious and/or semi-pervious surfaces for the project. The project may be eligible for fee credits for existing impervious areas previously permitted or built prior to the establishment of the flood control zone (see County Design Criteria for further information). The fees are used to maintain drainage infrastructure, identify problem areas, and improve our storm drainage system. 


Zone 5 Master Drainage Plan - completed in 1998
Zone 5 & 6 Master Drainage Plan - completed in 2013 (include Appendices)

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