Drainage Design Manual, Hydrology - Flood Control District of ...

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Drainage Design Manual for Maricopa County Hydrology: Application Figure 9.4 EXAMPLE INTENSITY-DURATION-FREQUENCY GRAPH (using Table 9.5) 2. Compile a D-D-F table of point precipitation data and compute I-D-F data. Prepare an I-D-F graph. Refer to Table 9.1, Table 9.5, and Figure 9.4. 3. Compute the Resistance Coefficient (K b ) for each subbasin using Table 3.1. Subbasin S1, using K b type C for the Hillslope area and K b type B for the desert/rangeland area: 9-18 August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Application K bNHS ( ) = (– 0.025)log 10 ( 65.99) + 0.15 = 0.105 K bNDR ( ) = (– 0.01375)log 10 ( 65.99) + 0.08 = 0.055 ( 0.105) ( 54.72) + ( 0.055) ( 11.27) ( ) = ------------------------------------------------------------------------------- = 0.096 65.99 K bweighted Subbasin S2, using K b type B: K b = (– 0.01375)log 10 ( 12.60) + 0.08 = 0.065 Subbasin S3, using K b type B for the desert/rangeland area and K b type A for the developed area: K bNDR ( ) = (– 0.01375)log 10 ( 21.18) + 0.08 = 0.062 K bDev ( ) = (– 0.00625) log 10 ( 21.18) + 0.04 = 0.032 ( 0.062) ( 11.85) + ( 0.032) ( 9.33) ( ) = ---------------------------------------------------------------------------- = 0.049 21.18 K b weighted Subbasin S4, using K b type B for the desert/rangeland area and K b type A for the developed area: K bNDR ( ) = (– 0.01375)log 10 ( 27.80) + 0.08 = 0.060 K bDev ( ) = (– 0.00625)log 10 ( 27.80) + 0.04 = 0.031 ( 0.060) ( 2.07) + ( 0.031) ( 25.73) ( ) = ---------------------------------------------------------------------------- = 0.033 27.80 K b weighted The K b values for each subbasin are: S1: K b = 0.096 S2: K b = 0.065 S3: K b = 0.049 S4: K b = 0.033 August 15, 2013 9-19
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