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

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Drainage Design Manual for Maricopa County Hydrology: Application 3. Calculate the Clark unit hydrograph parameters for subbasins S2 through S11 a. Using Table 5.2 or Figure 5.4, determine the adjusted slope for subbasins S2, S3, S7, S8, S9 and S10 (subbasins with average slopes greater than 200 ft/mi). Slope Subbasin ID Average ft/mi Adjusted ft/mi S2 227.8 224.5 S3 222.3 220.1 S7 215.2 214.1 S8 201.8 201.6 S9 537.3 307.0 S10 438.3 294.8 b. Compute the Resistance Coefficient (K b ) using Table 5.3 and area values from Table 9.9. Surface type C is selected for the natural areas, and type A is selected for the urban areas. Note that A in the K b equation is the total subbasin area in acres. Subbasin S2: K b = mlogA + b K b N = – 0.025 log( 2, 816.8) + 0.15 = 0.064 K b D = – 0.00625 log( 2, 816.8) + 0.04 = 0.018 K b W = ( 0.58) ( 0.064) + ( 0.42) ( 0.018) = 0.045 9-52 August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Application Using the above procedure, the K b for each of the Clark subbasins is as follows: Subbasin ID Drainage Area acres Percent Natural . -- K b . Percent Developed Natural Developed Weighted S2 2816.8 57.76 42.24 0.064 0.018 0.045 S3 2113.3 3.76 96.24 0.067 0.017 0.019 S4 1514.1 0.00 100.00 --- 0.020 0.020 S5 690.8 21.91 78.09 0.079 0.022 0.035 S6 675.0 18.19 81.81 0.079 0.022 0.033 S7 755.7 30.06 69.94 0.078 0.022 0.039 S8 613.2 30.55 69.45 0.080 0.023 0.040 S9 529.0 20.08 79.92 0.082 0.023 0.035 S10 284.2 0.00 100.00 --- 0.025 0.025 S11 1164.9 81.83 18.17 0.073 0.021 0.064 c. Compute Time of Concentration (T c ) as a function of Intensity (i) using Equation (5.5) Subbasin S2: T c 11.4L 0.5 0.52 – 0.31 = K b S i –0.38 T c = ( 11.4) ( 4.11) 0.5 ( 0.045) 0.52 ( 224.5) 0.31 – –0.38 i –0.38 T c = 0.860i August 15, 2013 9-53
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