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<br />03/27/1995 13:11 <br /> <br />71 92753051 <br /> <br />HRM <br /> <br />PAGE 06 <br /> <br />.. <br />#e <br /> <br />Ms. Honey R. Moschetti <br /> <br />-2- <br /> <br />March 14, 1995 <br /> <br />3.. The use oflower precipitation values as reported in the National Weather Service's <br />Hydrometeorological Report No. 55A (HMR 55A). HMR 55A was published in <br />1988, and is an update of previously used extreme rainfall depths. HMR 55A <br />modified the precipitation values for extreme frequency rainfall events for some parts <br />of the state. <br /> <br />We have also completed our preliminary incremental damage analysis (IDA). using our estimate of <br />the 50 percent PMP inflow flood as the basis for the analysis. Our analysis indicates that a detailed <br />IDA will not result in an appreciable decrease in the inflow design flood for the dam.. We believe <br />that this is largely the result of the substantially lower base flood. <br /> <br />Based on the results of our preliminary IDA, we recommend against proceeding with the detailed <br />IDA. We further recommend using the 50-percent PMP flood as the inflow design hydrograph for <br />DeWeese Dam, and preparing a lener report to the Colorado State Engineer's Office (SEO) for their <br />review and approval of the inflow design flood. As stated in our Februmy 6. 1995 proposal, we will <br />complete the required report, along with any appropriate meetings with the SEO. for a not-to-exceed <br />cost of $6,000. <br /> <br />I wilI be glad to answer any questions you might have regarding our work done to date or its impact <br />on future dam safety work at DeWeese Dam. <br /> <br />Sincerely. <br /> <br />GEl CONSULTANTS, INC. <br /> <br /> <br />Brian S. Johnson, P.E. <br />Project Manager <br /> <br />BSl:jlb <br /> <br />'~~^,,14L'J1l.11aM <br />