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

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Drainage Design Manual for Maricopa County Hydrology: Indirect Methods 8.4 INDIRECT METHOD NO. 3 - REGIONAL REGRESSION EQUATIONS An analysis was performed of streamflow data for a study area comprised of Arizona, Nevada, Utah, and parts of New Mexico, Colorado, Wyoming, Texas, Idaho, Oregon, and California (USGS Open File Report 93-419, 1994). That analysis resulted in sixteen sets of regional regression equations for the study area. Two of those regions (R12 and R13) are in Maricopa County as shown in Figure 8.6. These regional regression equations can be used to estimate flood magnitude-frequencies for watersheds in Maricopa County. Regression equations are provided for both regions to estimate flood peak discharges for frequencies of 2-, 5-, 10-, 25-, 50-, and 100-years. Use of the regression equations is recommended only if the values of the independent variables (drainage area and mean basin elevation) for the watershed of interest are within the range of the database used to derive the specific regression equation. The regression equations for both regions (R12 and R13) are functions of drainage area. In general, the equations are applicable to unregulated watersheds with drainage areas less than 200 square miles. The regression equation for Region 12 is also a function of mean basin elevation. Figure 8.7 is a scatter diagram of mean basin elevation versus drainage area for the database used to derive the regression equations as provided in USGS Open File Report 93-419. The regression equations for Regions 12 and 13 are provided in Table 8.2 and Table 8.3, respectively. Also provided for each set of regression equations are graphs, Figure 8.8 and Figure 8.9, of the 100-year LP3 discharge estimates versus drainage area for Flood Regions 12 and 13, respectively. A line depicting the relation between the 100-year peak discharge (computed from the regional regression equation) and drainage area is shown on each of those graphs. These graphs were recreated from the data provided in USGS Open File Report 93-419. 8-12 August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Indirect Methods Figure 8.6 FLOOD REGIONS FOR MARICOPA COUNTY R12 YAVAPAI COUNTY T8N 17 T7N GILA COUNTY LA PAZ COUNTY YUMA COUNTY MARICOPA COUNTY 10 R13 Sycamore Creek PINAL COUNTY T6N T5N T4N T3N T2N T1N T1S T2S T3S 10 T4S T5S T6S R8 COCONINO T7S T8S MOHAVE R10 R11 NAVAJO APACHE T9S YAVAPAI MARICOPA COUNTY PINAL COUNTY PIMA COUNTY LA PAZ YUMA R12 MARICOPA R13 GILA T10S T11S GRAHAM PINAL R14 GREENLEE R10W R9W R8W R7W R6W R5W R4W R3W R2W R1W R1E R2E R3E R4E R5E R6E R7E R8E R9E PIMA R10E R11E SANTA CRUZ COCHISE R12E Location Map Legend Flood Region Boundary Interstate Highway Streams City of Phoenix 10 0 10 20 Cities Miles August 15, 2013 8-13
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