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<br />e <br /> <br />e <br /> <br />e <br /> <br />FLOODPLAIN REPORT - Tyra Tract D and Sawmill Gulch, Breckenridge, Colorado <br /> <br />split flow condition be maintained, and therefore we have complied with those requests by <br />incorporating a flood bypass facility. <br /> <br />RELATED STUDIES <br /> <br />For reference purposes, several other studies or reports are important for the understanding and <br />the delineation of the Sawmill Gulch floodplain. The 1979 FIS, Flood Insurance Study, Town of <br />Breckenridge, Summit County, Colorado, provides the original basis for the FEMA floodplain <br />for Sawmill Gulch. It was published by FEMA in December 1979. It is presently out of date. <br /> <br />The Town of Breckenridge commissioned an area-wide study of drainage basins affecting the <br />Town to provide for more effective planning and development. The study was performed by <br />Lenzotti and Fullerton and resulted in the issuance of a "Master Plan" in 1988: Drainage Master <br />Plan, Town of Breckenridge, Colorado, Draft Report (revised April 6,1993). This report <br />encompassed hydrology and hydraulic studies for drainageways impacting the Town of <br />Breckenridge as well as areas viewed as having potential for future inclusion into the Town. The <br />study entailed a detailed hydrologic evaluation as well as preliminary hydraulic evaluations. <br />This report provides the hydrologic basis for Sawmill Gulch. <br /> <br />In December 1996, FLO Engineering, Inc. of Breckenridge, Colorado released a study entitled: <br />Revised Preliminary Flood Study, Tyra Tract D. The FLO report is essentially a precursor to this <br />WWE report, and presents preliminary results of investigations into the Tyra Tract D site and its <br />interaction with Sawmill Gulch. The FLO study did not extend upstream or downstream of the <br />Tract D property. It presented preliminary hydraulic analyses and referenced the Drainage <br />Master Plan for Breckenridge for the hydrology aspects. The conclusions of the FLO report were <br />that in the existing condition, significant overbank flooding occurs from Sawmill Gulch, <br />essentially as documented herein by WWE. <br /> <br />Conducting a revised study for lower Sawmill Gulch is Foothills Engineering Company (FEe), <br />as a contractor to FEMA. The FEC study is in draft form and currently is being reviewed by the <br />Denver office of FEMA' WWE had access to limited draft FEC data. Our study for Sawmill <br /> <br />971-055.010 <br /> <br />Wright Water Enginee~, Inc. <br /> <br />Page 4 <br />