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

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Drainage Design Manual for Maricopa County Hydrology: Application 2. Plot the unit peak discharge on a copy of Figure 8.1. Note the location of the plotted point in relation to the various curves in that figure. B. Verification with USGS Data for Arizona: 1. Calculate the 100-year peak discharge estimate by Equation (8.1) 2. Select Figure 8.3 or Figure 8.4 according to watershed drainage area size, and plot the 100-year peak discharge estimate on a copy of that figure. 3. Using watershed drainage area as a guide, identify gaged watersheds of the same approximate size from Table 8.1. Tabulate the peak discharge statistics and watershed characteristics for those gaged watersheds by using the USGS report (Garrett and Gellenbeck, 1991). Compare these to the computed peak discharge estimates and watershed characteristics for the watershed of interest. C. Verification with Regional Regression Equations: 1. Determine the flood region (Figure 8.6). 2. If the basin(s) fall within Region 12 on Figure 8.6, then calculate the mean basin elevation (ELEV). This can be done by placing a transparent grid over the largest scale topographic map available. The grid spacing should be selected such that at least 20 elevation points are sampled. The elevation at each grid point is determined and the elevations are then averaged. 3. Check the drainage area using the appropriate scatter diagram to determine if the values are in the “cloud of common values.” Proceed with the analysis regardless of the outcome, but clearly note if the variable values are not within the “cloud of common values.” 4. Calculate the peak discharge estimates using the applicable regression equations for the flood region within which the project site is located. 5. Plot the 100-year peak discharge estimate on a copy of the appropriate Q 100 data points and 100-year peak discharge relation graph (Figure 8.8 or Figure 8.9). D. For all three Indirect Methods: 1. Quantitatively and qualitatively analyze the results of the primary and the secondary peak discharge estimates. Address watershed characteristics that may explain differences between the primary and secondary estimates. 2. Prepare a summary of results by all methods and a qualitative evaluation of the results. 9-66 August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: References 1 10 REFERENCES Arkell, RE, and Richards, F. “Short Duration Rainfall Relations for the Western United States.” Conference on Climate and Water Management: A Critical Era, and Conference on the Human Consequences of 1985’s Climate, August 4-7: American Meteorological Society; 1986:136-141. Bach, LB. Determination of Infiltration, Runoff, and Erosional Characteristics of a Small Watershed Using Rainfall Simulator Data, unpublished master’s thesis, Department of Civil Engineering, New Mexico State University, Las Cruces, New Mexico. 1984:69. Bedient, PB, and Huber, WC. Hydrology and Floodplain Analysis, Addison-Wesley Publishing Company; 1988:650. Bonnin, GM, et al, National Oceanic and Atmospheric Administration (NOAA); 2004; NOAA Atlas 14, Precipitation-Frequency Atlas of the United States, Volume 1, Ver: Semiarid Southwest (Arizona, Southeast California, Nevada, New Mexico, Utah), including Appendix A1. Boughton, WC, Renard, KG, and Stone, JJ. “Flood-Frequency Estimates in Southeastern Arizona,” Journal of Irrigation and Drainage Engineering, ASCE. 1987; 113(4):469-478. Clark, CO. “Storage and the Unit Hydrograph,” Transactions of the ASCE. 1945; 110:1419-1488. Costa, JE. “Hydraulics and Basin Morphology of the Largest Flash Floods in the Conterminous United States,” Journal of Hydrology. 1987; 93:313-338. Creager, WP, Justin, JD, and Hinds, J. Engineering for Dams, John Wiley and Sons, New York; 1945:99. Crippen, JR. “Envelope Curves for Extreme Flood Events,” Journal of Hydraulic Engineering, ASCE. 1982; 108(10):1208-1212. Cudworth, AG. Flood Hydrology Manual, U.S. Bureau of Reclamation, Denver, Colorado; 1989:243. Eggert, KG. Modeling the Unsteady Infiltration Process, unpublished master’s thesis, Colorado State University, Ft. Collins, Colorado; 1976. August 15, 2013 10-1
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