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DEPARTMENT OF THE ARMY OMAHA DISTRICT. CORPS OF ENGINEERS 6014 1I. S. POST OFFICE AND COURT HOUSE OMAHA. NEBRASKA 68102 MROPD-R 14 August 1915 y~. Richard J. Brasher District.Engineer, District 6 State Department o~ Highways 2000 South Holly Denver, Colorado 80222 Dear Mr. Brasher: This is in ~urther response to your letter o~ 11 July 1915 regarding the hydrologic report relating to your Project I 16-1(35). Our Engineering Division has reviewed your hydrologic report, and their analysis is as follows. The section on design cons~deration in your report indicates that devel- oprnent is occurring rapidly in the Clear Creek basin and a.J.ong the Clear Creek channel. This consideration, among others, is the reason \/'e feel that the ~low records on Clear Creek do not re~lect the true ~lood poten- tial of the basin no\/' and especially in the future. A preliminary analysis o~ the lo\/'er 111 square miles of the basin, using the runof~ block o~ EPA' s Surface Water Management Model, indicated a lOa-year peak might be somewhere in the range of 15,000 cubic feet per second to 25,000 cubic ~eet per second at the mouth. These figures are based on crude model runs in that many of the channel dimensions were estimated. In addition, our experience \/'ith the model is severely limited at this time. The results do point out, how- ever, a likely chance that historical records do not re~lect the true flood potential of the basin. Additional studies o~ Clear Creek \/'i11 be made in connection \/'ith the Denver urban studies in the near future., and hopefully the results will provide a much n~rower range of numbers. We are planning to publish an analysis of the current hydrology of the South Platte River and its tributaries in the Fall o~ 1915. This informa- tion will be provided Federal, St~te, and local agencies for their use as they deem appropriate. .. We appreciate the opportunity to review your report. Sincerely yours, -cl,<021222,7::;--.. ,,~~ <:7~~,,- ~ ... S'~ ~ olS 1- Y2 ~\j<J'J ~ .,. ~\. "'I - <;otto "" ". ~1: ~.~. fJ'" c..... c. Co,) ~ ("~ o~ :\;-' '6 " 6'.t9SvS't ..~-: \.- ~;~. // .. / 'i/f '. ""7..:.f .:// "-- {; If . , ,. Iv- C. F. THO:.IAS" " Chief, Planning Division .~~..,v"'o..... ~ - . . < " ~ ~ ~ .. .. .. " '....6_1901..