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Last modified
1/25/2010 6:24:47 PM
Creation date
10/4/2006 10:58:52 PM
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Floodplain Documents
County
Gilpin
Community
Black Hawk
Basin
South Platte
Title
Black Hawk Chunnel Technical Information
Date
2/3/1995
Prepared For
Black Hawk
Prepared By
Futura Engineering Inc
Floodplain - Doc Type
Project
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />. <br />- <br />'. <br />. <br />,. <br />. <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Page 6 <br />Chunnel Committee <br />December 2, 1994 <br /> <br />the Gregory Flume will be analyzed to predict sediment load size (diameter) and amount. <br /> <br />Debris flow analysis for Gregory Gulch is the next step in analyzing the Chunnel <br />performance (similar to analyses for CWCB for Ouray, Colorado, for example). Debris flow <br />will not be a concern on North Clear Creek. The existing and proposed configurations of the <br />Gregory Gulch flume and ultimate stabilization of the upstream channel may have an impact <br />on Chunnel performance at the outlet of the Gregory flume. North aear Creek Chunnel and <br />low flow channel system will only improve the Gregory flume outlet by providing water to <br />transport sediments through the system. <br /> <br />Preliminary sediment transport calculations have been completed which verify the <br />performance of the Chunnelnow flow channel system. They will be made available to the <br />Corps of Engineers in a design report as noted above. <br /> <br />Peer/Colleague Technical Review <br /> <br />U.S. Army Corps of Engineers Hydraulics Section Hydraulic Engineer Robert J. Buchholz <br />has reviewed the site and discussed hydraulic design parameters, methods, pitfalls and designs <br />with Futura. A design report is partially compiled as of this writing which includes <br />hydrology, hydraulics, sediment/debris transport and energy /hydraulic grade line calculations. <br />Mr. Buchholz has also provided information on a California Corps of Engineers project <br />which experienced capacity problems due to insufficient analysis of the items noted above. <br /> <br />The Upper Oear Creek Watershed Association has appointed a liaison (Ms. Holly Huyck) <br />whose duty is to provide additional peer review. The initial comments have related to <br />appropriate fill material placement to ensure water does not seep from the channel leaving it <br />dry during the low flow period of the year. The preliminary design will be discussed further <br />with the UCCW A technical representative for comparison with their case studies. <br /> <br />Low Flow ChannellLandscape Architecture Design <br /> <br />Black Hawk stream scape elements are the basis of this design. Other than preliminary <br />hydraulic analyses, this effort is primarily a preliminary and final design task. The author of <br />this document has been involved in similar engineering work on several COOT channel <br />changes during the late 1970's and early 1980's including Ten Mile Canyon, Vail Pass, . <br />Glenwood Canyon, DeBeque Canyon and several smaller projects. A probable <br />subconctractor will be JG Johnson Architects, whose principal, James Johnson, AIA worked <br />for COOT during the same period and work on many of the same projects. <br /> <br />S.H. 119 Widening Design and Local Drainage Connections <br /> <br /> <br />A preliminary horizontal alignment has been designed through two reaches of the Chunnel <br />
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