Documents and Standards

FC District Documents 

The following documents and standards were created by the FC District:

• Detention Basin Design Guidelines (PDF)
• Rational Method Guidelines (PDF)
• Rational Method Runoff Coefficients (PDF)
• Intensity Duration Frequency Curve Calculations (PDF)
• Junction Loss Coefficient Standard (PDF)
• N-Value Standard (PDF)
• Hydrograph Request Form (PDF)
• Flood Forecast Information - (7532 Handout (PDF))
• 50 Year Plan, Adopted by the Board of Supervisors - March 31, 2009 (PDF)
• General Drainage Standards in County Standard Plans (PDF)
• Drainage Area and Zone Map (small file) (large file) (PDF)
• Contra Costa County Flood Control and Water Conservation District Act

Document Library  

The following documents and standards were created by others and are good references: 

Studies

• Flood Insurance Study - March 21, 2017 Vol. I-V

Federal Highway Administration Documents (FHWA)

• HEC05 Hydraulic Charts for the Selection of Highway Culverts (PDF)
• HEC11 Design of Rip Rap Reventment (PDF)
• HEC15 Design of Roadside Channels with Flexible Linings (PDF)
• HEC22 Urban Drainage Design Manual (PDF)
• HDS-5 Hydraulic Design of Highway Culverts (PDF)

US Army Corps of Engineers

• US ACOE LA Method Unit Hydrographs July 1962 (PDF)
• Snyder Unit Graph 1938 AUG Article (PDF)

 Other Standards and References

 The FC District is currently reviewing its standards and comparing them to the following similar standards:

• Orange County Hydrology Manual
• Riverside County Hydrology Manual - Complete (RC website)
• San Bernardino County Hydrology Manual (PDF 9.6 MB)
• Sacramento County Hydrology Manual

Resources

• Expenditure Policy (PDF)
• Drainage Area Credit and Reimbursement Policy (PDF)