Confirm the data for a 10-yr storm from Equation and Table for 10-min, 15-min, 30-min, and 60-min durations. Compare to Figure.
Equation
Table
Coefficients for Rational Method Intensity Formula
Design Storm | ||||||
| 2 yr | 3 yr | 5 yr | 10 yr | 25 yr | 100 yr |
e | 0.8315 | 0.8075 | 0.7881 | 0.7742 | 0.7808 | 0.7500 |
b | 75.01 | 77.27 | 84.14 | 93.53 | 115.90 | 125.40 |
d | 16.2 | 17.1 | 17.8 | 18.9 | 21.2 | 21.8 |
Figure
Typical IDF curves.
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