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

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Drainage Design Manual for Maricopa County Hydrology: Indirect Methods Table 8.2 FLOOD MAGNITUDE-FREQUENCY RELATIONS FOR THE CENTRAL AZ REGION (R12) Equation: Q, peak discharge, in cubic feet per second; AREA, drainage area, in square miles; and ELEV, mean basin elevation, in feet divided by 1,000. Recurrence interval, in years Equation Average standard error of model, in percent 2 Q = 41.1 AREA 0.629 105 5 Q = 238 AREA 0.687 ELEV -0.358 68 10 Q = 479 AREA 0.661 ELEV -0.398 52 25 Q = 942 AREA 0.630 ELEV -0.383 40 50 LOG 10 Q = 7.36 – 4.17 AREA -0.08 – 0.440 LOG 10 ELEV 37 100 LOG 10 Q = 6.55 – 3.17 AREA -0.11 – 0.454 LOG 10 ELEV 39 8-14 August 15, 2013
Drainage Design Manual for Maricopa County 10,000 Figure 8.7 SCATTER DIAGRAM OF INDEPENDENT VARIABLES FOR FLOOD REGION 12 REGRESSION EQUATION: ADAPTED FROM DATA CONTAINED IN USGS OPEN FILE REPORT 93-419 Hydrology: Indirect Methods 8,000 Mean Basin Elevation, in feet 6,000 4,000 2,000 0 0.1 1 10 100 1000 10000 Drainage Area, in square miles August 15, 2013 8-15
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