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

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Drainage Design Manual for Maricopa County Hydrology: Application Using the above procedure, T c as a function of i for each of the Clark subbasins is as follows: Subbasin ID Length miles K b Weighted Adjusted Slope ft/mi T c as a Function of i S2 4.11 0.045 224.5 0.860 S3 3.91 0.021 220.1 0.568 S4 3.40 0.020 197.0 0.534 S5 2.29 0.035 157.5 0.629 S6 2.06 0.033 144.2 0.595 S7 1.74 0.039 214.1 0.527 S8 2.36 0.040 201.6 0.634 S9 1.66 0.035 307.0 0.435 S10 1.83 0.025 294.8 0.389 S11 2.98 0.064 126.3 1.051 d. Develop a subbasin-only HEC-1 model using the 6-hour rainfall data, the procedures and example from Section 9.1, and the rainfall loss parameters from the procedures and example in Section 9.3 to compute rainfall excess (HEC-1 output for subbasin S2 follows). Use an estimate for T c . The purpose of the model is to compute rainfall excess, not peak discharge. Note: For the purpose of this example, only the HEC-1 model for subbasin S2 is provided. e. Sort the incremental rainfall excess values from the HEC-1 output from highest to lowest and tabulate the ten (10) highest values as follows: Time, hours & minutes Incremental Excess Rainfall, inches 0:00 0.15 0:05 0.15 0:10 0.15 0:15 0.11 0:20 0.11 0:25 0.11 9-54 August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Application Time, hours & minutes Incremental Excess Rainfall, inches 0:30 0.08 0:35 0.08 0:40 0.08 0:45 0.03 Total: 1.05 f. Compute the average intensity, i, for subbasin S2: i E T 1.05 = ----- = ----------------------- = T 10( 5 ⁄ 60) 1.05 --------- = 1.27 in/hr 0.83 where: E T = Sum of the ten (10) highest incremental rainfall excess values. T = Total time associated with E T , in hours. g. Compute T c and R for subbasin S2, using the relation from Step 3c above to compute T c , and Equation (5.8) to compute R. T c = 0.86i – 0.38 = 0.86( 1.27 – 0.38 ) = 0.786 hours 1.11 – 0.57 R = 0.37T c A L 0.80 R = 0.37( 0.786) 1.11 ( 4.401) – 0.57 ( 4.11) 0.80 R = 0.377 hours Using the above procedure, T c and R for each of the Clark subbasins are as follows: Subbasin ID T c hours R hours S2 0.786 0.377 S3 0.489 0.252 S4 0.467 0.259 August 15, 2013 9-55
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