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<br />C. Types of Rainstorms <br />Rainstorms in the Yuma area are either low intensity, general <br /> <br />rains or high intensity, thunderstorm type rains. <br /> <br />The June 5, 1965 storm was a general storm. This type of storm <br /> <br />covers very large areas and in general produces a low intensity, long <br /> <br />duration rainfall. A large general storm will usually produce rainfall <br /> <br />continuously for 1 to 5 days: <br /> <br />The thunderstorm on the other hand usually produces the majority <br /> <br />of its rain in less than an hour. The intense portion of a thunderstorm <br />usually covers only a few square miles and are seldom stationary. <br /> <br />f <br /> <br />D. Design Storms: <br />The regionalized S.C.S. rainfall probabilities have been used for <br />preparation of the deSign storms because of the increased reliability <br />obtained by regionalizing precipitation records from several local <br />stations. Figures 8 and 9 show the 100 year, 24 hour and 6 hour maximum <br />point rainfall depths. Table 2 gives point rainfall (thunderstorm) design <br /> <br />storms for the 100 year recurrence interval, the 10 year recurrence <br /> <br />interval, and the 2 year recurrence interval. <br /> <br />Table 2 <br />Design Point Thunderstorm Rainfall <br /> <br />I <br /> <br />, <br /> <br />Probable Return Period <br /> <br />Maximum Rain for Each Duration <br /> <br /> 5 min 10 min 15 mi n 30 min 60 min 2 hr 6 hr 24 hr <br />100 year .87 1.35 1.70 2.36 2.9,9 3.29 3.84 4.56 <br />10 year .56 .86 1.09 1. 51 1.92 2.14 2.62 3.18 <br />2 year .35 .54 .68 .94 1.20 1.38 1.69 2.07 <br /> <br />-11- <br />