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<br />If it is assumed that the rain fell between 2100 and 2300, the 2- <br /> <br /> <br />hour storm total of 2.01 to 2.20 inches compares to the 2-year <br /> <br /> <br />rainfall of 1.82 inches and the 5-year rainfall of 2.35 inches as <br /> <br /> <br />given by TP-40. <br /> <br />If it is assumed that the rain fell between 2130 and 2230, but <br />was recorded in 1:1070 hourly intervals, the 1 hour storm total of <br />roughly 2.1 inches compares to the 5 -year rainfall total of 2.10 as <br />given by TP-40. <br /> <br />If the rain actually fell in 30 minutes, such as between 2145 and <br />2215, but was recorded in 1:1070 hourly intervals, the 30 minute storm <br />" <br />total of roughly 2,1 inches compares to the 10-ye~r rainfall total of <br />1.90 inches and the 25-year rainfall total of 2,25 inches as given by <br />TP-40. <br /> <br />Supplementary information' indicates that heavier rainfall may <br /> <br /> <br />have occurred, both in the upper Elm Creek Basin and nearer to Platte <br /> <br />Center itself. According to the HRD Bulletin of l5 June 1990, 4 <br /> <br /> <br />inches of rain was reported at Madison, about 12 miles north of the <br /> <br /> <br />basin and 3.55 inches was reported at ,Columbus about 12 miles <br /> <br /> <br />soutaeast of the basin. Also, according, to the National, Yeather <br />- . , <br />Serv~ce bulletin "Monthly Report of River an~ Flood Conditions, June <br />1990" rainfall amounts may have ranged up to 4 or 5 inches in the Elm <br />Creek Basin. Antecedent m?isture conditions were extremely wet, due <br />to nearly 3 inches of rain,'which fell 1:1070 days earlier. <br /> <br />The density of data is not adequate to accurately determine a <br />basin wide rainfall average and assign a spe~ific frequency. From the <br />dita that are available, the rainstorm that caused the June 1990 Flood <br /> <br />B-2 <br />