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e e e F January 13, 1998 Ms. Peggy Bailey Project Engineer Wright Water Engineers, Inc. P.O. Box 219 Glenwood Springs, CO 81602 Subject: Hydraulic Model Data and Map Below Four O'clock Road, Sawmill Gulch, Breckenridge, Colorado Dcar Ms Bailey: ] finally got somc time and put together some additional information on Sawmill Gulch for your use. As I indicated on the telephone, this data was prepared for ~llbmittal to FEMA, but was not sent in with the rest of the data FEC prepared for the Town of Breckenridge, under direction from Dr. John Liou, the FEMA Regional Hydrologist/Hydra ulie Engineer. Thc map is at 50 scale, and shows the I-foot contours in grey, the lO-foot contours in red, the cross sections in green and the floodplain widths at each section in cyan. This map does not attempt to interpolate the position of the floodplain boundary bct\\'een sections. The profiJe~ are a plot of the 100-year water surface elevation for Sawmill Gulch at the computed now of 130 cfs that was used in our study. We calculated that only 130 efs would stay in the channel immediately below Four O'clock Road, although at least ~Oll1e of the flow might return prior to the downstream end of the study reach. This return now was not added back into the channel flow for our work. These profiles were prepared using the same software used by FEMA's technical contractor, but are not official FEMA profile plots. A sheet that shows the relation between the letter and number cross section designations is also included in this transmittal. I hope that this information is helpful on your project. Please feel free to give me a call if you need anything else. 1 can be reached at (303) 278-0622, Ext. 141. Sincerely, vJ~'>>1.~ Thomas M. Rossillon. P.E. C \FEM';"S3.103 BRK\1.~3.ge DOC r- (' ~ E~~S'~.C-t:.; CL'i;~,V: ;-' !:'~ .' ' ~~r' ,-,_ .. .' S l - C (;;.,: . : ~ 1 ,~, . ~ ...' "