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Contra Costa County

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Documents and Standards



FC District Documents

The following documents and standards were created by the FC District:
  • Detention Basin Design Guidelines 
  • Rational Method Guidelines 
  • Rational Method Runoff Coefficients
  • Intensity Duration Frequency Curve Calculations 
  • Junction Loss Coefficient Standard 
  • N-Value Standard 
  • Hydrograph Request Form 
  • Flood Forecast Information - (7532 Handout)
  • 50 Year Plan, Adopted by the Board of Supervisors - March 31, 2009
  • General Drainage Standards in County Standard Plans
  • Drainage Area and Zone Map (small file)  (large file)
Document Library
The following documents and standards were created by others and are good references:

Studies


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

Federal Highway Administration Documents (FHWA)

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

US Army Corps of Engineers


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

O

ther 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
  • Drainage Area Credit and Reimbursement Policy
  • Watershed Day at the Capitol 2018
  1. Winter Storm Preparedness
  2. Sandbags
  3. Available Soil
  4. CCMaps
  5. Documents and Standards
  6. FAQs
  7. Floodplain Program
  8. Hydrograph Standards
  9. Hydrology Standards
  10. One Water Brochure
  11. Walnut Creek Watershed Council Achievement Report
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