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<br />DRAINAGE CRITERIA MANUAL <br /> <br />RAINFALL <br /> <br />3;" <br /> <br />e <br /> <br />Table 3-2 ,-, viL <br />~ ! "',I <br />Example 3.2 Design Stann Calculation -;:._ \-fOil. ) J <br /> <br />la-Year Design Storm <br />I-Hour Depth = 1.60 Inches <br /> <br />Time <br />(Hi nutes) <br /> <br />Percent of I-Hour <br />Ra infa 11 <br /> <br />Incremental <br />Rainfall - Inches <br /> <br />e <br /> <br />5 2.0 0.03 <br /> <br />10 3.7 0.06 <br /> <br />15 8.2 0.13 <br /> <br />20 15.0 0.24 <br /> <br />25 25~0 0.40 <br /> <br />30 12.0 0.19 <br /> <br />35 5.6 0.09 <br /> <br />40 4.3 0.07 <br /> <br />45 3.8 0.06 <br /> <br />50 3.2 0.05 <br /> <br />55 3.2 0.05 <br /> <br />60 3.2 0.05 <br /> <br />65 3.2 0.05 <br /> <br />70 3.2 0.05 <br /> <br />75 3.2 0.05 <br /> <br />80 2.5 0.04 <br /> <br />85 1.9 0.03 <br /> <br />90 1.9 0.03 <br /> <br />95 1.9 0.03 <br /> <br />100 1.9 0.03 <br /> <br />105 1.9 0.03 <br /> <br />110 1.9 0.03 <br /> <br />115 1.7 0.03 <br /> <br />120 1.3 0.02 <br /> <br />Total 115.7 1.84* <br /> <br />* Note that the 2-hour total is close, but not exactly the same value <br />of the 2-hour, 10-year depth shown in example in 2.1.2. These small <br />differances are considered to be acceptable. <br /> <br />,- <br /> <br />. <br /> <br />5-1-84 <br />