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

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<strong>Drainage</strong> <strong>Design</strong> <strong>Manual</strong> for Maricopa County<br />

<strong>Hydrology</strong>: Indirect Methods<br />

Table 8.2<br />

FLOOD MAGNITUDE-FREQUENCY RELATIONS FOR THE CENTRAL AZ REGION (R12)<br />

Equation: Q, peak discharge, in cubic feet per second; AREA, drainage area, in square miles;<br />

and ELEV, mean basin elevation, in feet divided by 1,000.<br />

Recurrence<br />

interval,<br />

in years<br />

Equation<br />

Average standard<br />

error <strong>of</strong> model,<br />

in percent<br />

2 Q = 41.1 AREA 0.629 105<br />

5 Q = 238 AREA 0.687 ELEV -0.358 68<br />

10 Q = 479 AREA 0.661 ELEV -0.398 52<br />

25 Q = 942 AREA 0.630 ELEV -0.383 40<br />

50 LOG 10 Q = 7.36 – 4.17 AREA -0.08 – 0.440 LOG 10 ELEV 37<br />

100 LOG 10 Q = 6.55 – 3.17 AREA -0.11 – 0.454 LOG 10 ELEV 39<br />

8-14 August 15, 2013

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