Drainage Areas

Drainage Areas:
  • Provide flood protection planning for future development
  • Provide multi-jurisdictional planning of major drainage systems
  • Allows management of major drainage infrastructure as it develops
In Contra Costa County, a Drainage Area (DA) is a legally formed entity with a:
  • Legal Boundary Map
  • Land Use Map
  • Hydrology Map
  • Drainage Area Plan
  • Fee Ordinance