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<br />. <br /> <br />., <br /> <br />Hr. Sid 1- 0 x <br />August 27, 1981 <br />1',J(j(' t" r ee <br /> <br />be provided to the first floors will probably result ln <br />dpproximdtely the Sdme first floor elevations If the <br />profilc' WdS recomplJ!('d tl5inq the correct. dischdrqe, <br />roughness coefficient, and standard 1.0 feet of <br />freeboard commonly used in floodplain management. <br />Therefore, we have no signIficant problem with the final <br />recommend,d ions of 111<' study with respect to first 'fl.oor <br />elevations. <br /> <br />It would hdve been helpful if the developer's floodplan <br />study hdd recommended specific first fl.oor elevations <br />for each of the proposed buildings, This may have <br />expedited the application by all.owing us to comment <br />directly on the project itself and save the hassling <br />over how they were obtdined for later, <br /> <br />7. Freeboard <br /> <br />Althoush we bel ieve the final results for thIs specific <br />project are satisfactory, we cannot endorse for general <br />floodplain management purposes the concept of using a <br />larger freeboard to offset a water surface profil.e <br />which underestimates IOO-year flood depths and flooded <br />arhlS. Some sil:es which are beyond the limits of the <br />floodplain for the lower dIscharge but which are <br />actually within the I imits of the true 100-year <br />floodplaIn may be erroneoulsy thought to be not subject <br />to any freeboard requirement. The use of freeboard <br />based on hIghway department criteria in conjunction <br />with this profile is satisfactory but is not a standard <br />procedure. <br /> <br />8. Future Studies <br /> <br />Fulurc. hydroloclY studies on the Eagle above Minturn can <br />be based on either Mr. Oezman's study or the FIA's <br />hydrology since they dre essentiall.y the same and <br />weIghed to the gaging station at Redcliff. The FIA <br />studies for this redch have already been approved by the <br />CWCIl. <br /> <br />Downstream of Minturn, we recommend the hydrology be <br />developed which is weighted more towards the gagIng <br />station ddtd at Ed'lle dnd Gypsum. The data for the <br />Eagle station was apparently not evaluated at al.l in <br />Mr. De z man's s t u d y . <br /> <br />The selection of rOu'lllflf'SS coefficents Is somewhat <br />subjective and varic's from reach to reach. However, lf <br />the specific impact of the factors that effect base <br />