Development of the San Joaquin County Hydrology Manual

by T. V. Hromadka,
J. J. DeVries,
M. Callahan,
J. Pulver,

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water


A hydrology manual was prepared for the County of San Joaquin, California for the determination of storm runoff quantities for the design of flood management facilities, floodplain analysis, and drainage system design. Runoff is computed from rainfall for specific frequencies and duration. Appropriate loss rate procedures were developed based on land use and soil types. Runoff for small subbasins is computed using the Rational Method. For areas above one square mile in area, unit hydrograph calculations are used to compute runoff. Streamflow routing procedures were defined, and methods for analysis of flow-through and flow-by detention basins were developed. Due to the uncertainty in establishing an accurate value for the peak discharge associated with a specified frequency of a flood the parameters in the manual were chosen to provide an 85% confidence level for the flood discharges.

Subject Headings: Flood frequency | Computing in civil engineering | Hydrology | Building design | Hydraulic design | System analysis | Drainage systems | Water discharge | California | United States

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