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<br />. <br /> <br />. <br />MEMOMNDUM <br /> <br />COLORADO WATER CONSERVATION BOARD <br />J. William McDonald <br />Director <br /> <br />TO: Monte Vista Flood Insurance File <br /> <br />FROM: D. Randolph Seaholm <br /> <br />DATE: July 19, 1982 <br /> <br />SUBJECT: Final Review and designation of the Monte vista Flood <br />Insurance Study (Proof Copy dated March 30, 1982) <br /> <br />A review of the proof copy versus the review draft of the <br />flood insurance study shows no significant changes were made <br />during the review period. <br /> <br />However, a comparison of the FIS with the previously <br />designated 1969 Corps study reveals the following differences: <br /> <br />1) The hydrology was reduced slightly as shown in the <br />attached table. This reduction is not explained in the <br />FIS report. A phone conversation with Mr. Richard Wray <br />of CDM reveals the reduction is do to adding the last 12 <br />years of stream gaging record into the Log Pearson <br />analysis. Changing the hydrology was verbally agreed to <br />by this office according to Rich. This reduction is <br />between 5 and 6% of the total discharge and will not be <br />examined further as it falls within the accuracy <br />limitations of the study. <br /> <br />The drainage area shown at 1320 square miles is in <br />error and will be corrected to 1590 square miles which <br />will then correspond to the drainage areas listed by the <br />Corps & USGS. <br /> <br />Rio Grarrle near M:mte Vista, Colorcrlo <br />Summary of Disd1arges (cfs) <br /> <br />Source/IDeation D.A. -10 yr -50 yr -100-yr -500 yr <br /> or <br /> IRF <br /> 1590 mi2 <br />FIS @ Monte Vista 1320 mi2 9,320 11,850 12,880 15,150 <br />COE@ Sevenmile Plaza 1560 mi2 14,000 <br />COE@ Homelake Rd Bridge 1620 mi2 13,300 <br />fUSGS @ Monte Vista Gage 1590 mi2 <br />6/29/27 Flocx'l of Reoord <br /> <br />SPF <br /> <br />20,000 <br /> <br />16,800 <br /> <br />18,500 <br /> <br />192 <br />drsJ\nv/f <br />