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<br />I. INTRODUCTION <br /> <br />The objective of COOT Project No. C279A-003 is to improve safety to businesses and <br />the traveling public on State Highway (SH) 279, in the City of Black Hawk. Public <br />safety can be increased by reducing the flood hazards associated with the Gregory <br />Gulch flume. The capacity of the flume is, apparently, insufficient to carry the flows <br />from major storm events. The goal of this project is to increase the efficiency of the <br />Gregory Gulch flume which will increase the capacity, and to suggest alternative <br />features which will aid in passing the flow from a 100-year event. <br /> <br />The scope of work for the Gregory Gulch drainage project has been divided into two <br />parts, the hydrology investigation and the hydraulics investigation. The peak flow <br />resulting from a 100-year event in Gregory Gulch must be determined during the <br />hydrology investigation. After the peak flow has been defined, the second <br />investigation will include an examination of the hydraulics of the system, and proposed <br />alternatives for improving the efficiency of the system. <br /> <br />This working paper presents a summary of the hydrology investigation. A review of <br />existing hydrology studies on the Gregory Gulch catchment is carried out, accepted <br />flow prediction methods are examined, and methods appropriate for estimating peak <br />flows in the Gregory Gulch catchment are selected. A recommendation for <br />implementing the selected flow estimating method in Gregory Gulch catchment is also <br />included. - <br /> <br />A. Authorization <br /> <br />This study was authorized under the terms of Contract No. SA 11518, between the <br />Colorado Department of Transportation - Region 1 (CDOT-Rl) and J. F, Sato and <br />Associates, Inc. (JFSAl, Purchase Order No. 96100000045. The Notice-to-Proceed <br />was issued on June 4, 1996. <br /> <br />B. Compilation of Existing Reports and Data <br /> <br />The Colorado Water Conservation Board (CWCB), Federal Emergency Management <br />Agency (FEMA), and CDOT-Rl provided copies of reports and information regarding <br />the hydrology of the study area. CDOT-Rl also provided topographic maps of SH 279 <br />through Black Hawk. <br /> <br />1 <br />