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Contact the Application & Permit Center at (925) 674-7200. They will assist you in determining which permits you need for your project.
Any such obstructions will be removed as necessary for maintenance and access purposes and will not be repaired or replaced (Title 0; 914-14.010).
Then, use the 25-year Precipitation Duration-Frequency-Depth Curve found at the same link. Find 24-hours (1-day) on the x-axis, go up parallel to the y-axis on the graph to the mean seasonal rainfall for your site. Go horizontal parallel to the x-axis to the y-axis to read off the rainfall depth for the 25-year -24-hour storm. Hydrology Standards
Call 911 or the Sheriff’s Dispatch (925)646-2441 to report an illegal discharge going on right now. Call (925)313-2236 to report an illicit discharge that has taken place in unincorporated County or call 1-800-NO-DUMPING to report an illicit discharge that occurred in other cities/towns in Contra Costa County.