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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>: Rainfall<br />

TABLE 2.2<br />

DEPTH-AREA REDUCTION FACTORS FOR THE 24-HOUR DURATION RAINFALL<br />

Area, sq. miles<br />

Depth-Area Reduction Factor<br />

(ratio to point rainfall)<br />

0 1.000<br />

10 0.950<br />

20 0.918<br />

30 0.900<br />

40 0.887<br />

50 0.877<br />

60 0.870<br />

70 0.863<br />

80 0.857<br />

90 0.852<br />

100 0.848<br />

110 0.845<br />

120 0.841<br />

130 0.838<br />

140 0.835<br />

150 0.832<br />

200 0.820<br />

250 0.812<br />

300 0.806<br />

400 0.796<br />

500 0.783<br />

2-8 August 15, 2013

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