Transcription of EVALUATION OF RATIONAL METHOD “C” VALUES
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EVALUATION OF RATIONAL METHOD “C” VALUES
EVALUATION OF RATIONAL METHOD C VALUES February 1998 (Original Report) June 2002 (Update for Manual Revision) Principal Author Joe Hill OBJECTIVES There are six objectives for this study. 1. Review the runoff factors C VALUES for the RATIONAL procedure specified in the current Design and Procedure Manual. 2. Review other references. 3. Review the more detailed land use elements that are identified in the County general Plan and estimate the percent of area that is impervious associated with each. 4. Develop an expanded table of C VALUES that are consistent with the existing VALUES , but provide a greater range of categories that relate to General Plan Land Use categories. Also, provide a mathematical relationship between land use, soil type that can be used more easily for computation and programming purposes. 5. Provide a table on CN VALUES for the County Land Use categories that are consistent with the County Hydrology Manual.
C = 0.90 (% impervious) + CP (% pervious) * Department of Public Works Hydrology Manual, December 1991 edition. Where the runoff coefficient is the percent that runs off from the impervious area plus the
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