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FLOOD00197
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Last modified
11/23/2009 1:37:51 PM
Creation date
10/4/2006 9:08:39 PM
Metadata
Fields
Template:
Floodplain Documents
County
Hinsdale
Community
Lake City
Stream Name
Henson Creek
Title
Reconnaissance Study Henson Creek at Lake City
Date
11/1/1991
Prepared For
Lake City
Prepared By
US Army Corps of Engineers
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />Gunnison River. Hence the flooding would be a somewhat higher <br />velocity sheet flow of lower depth, rather t:1an typical <br />inundation flooding. The flood damages, the:r:efore, would be a <br />Imler depth of inundation-type wetting, acco:npanied by higher <br />than average damage to roads, utilities, and landscaping. If the <br />flows reached the 500-year return interval, the right bank would <br />alBo be overtopped. However, due to milder ;~lopes and an <br />enclosed basin for the 500-year flood, the d,'\mages on the right <br />oVElrbank would be of typical inundation type. <br /> <br />The existing north side spoil levee has been the major <br />concern of local interests because of potential damages to <br />streets, utilities, structures, and the town's tourism economy. <br />ThE! 1975 flood was estimated to have cost th,~ town over one-third <br />of its tourism income for the year due to th,ot publicity and <br />att:endant reduction i.n tourism. That second,'\ry impact of the <br />flood amounted to over $1 million of lost loo::al income from <br />tourism in addition to the direct effects of the flood. Locals <br />fear that another flood on Henson Creek would create unacceptable <br />economic hardship on the community. <br /> <br />Although the spoil levee provides some degree of flood <br />protection, it is not engineered, and the st,~bility of the spoil <br />mat:erial during a flood has not been proven. Reliance on this <br />mat:erial for flood protection could provide the area wi.th a false <br />sense of security regarding flood control capability. Should a <br />siqnificant flood breach the berm, a catastrclphic event could <br />occ:ur which will not likely cause loss of liee, but which could <br />re~;ul t in signif icant damage to structures a;ld contents. <br /> <br />Potential environmental and health problems could occur <br />during a flood as severe as the flood that occurred in 1975 when <br />thE: Treasure Hill Dam, located about 3 miles upstream, failed and <br />sent a surge of flow to the study area. At t:hat time, the water <br />well, which is located near the creek, was flooded, and untreated <br />wat:er entered the water supply system of the community. This <br />possibility still exists, although to a much lesser extent as <br />La~:e city has for flood proofed the well hou"e. <br /> <br />7. Hvdroloqv. Lake City is situated on two streams, Henson <br />Creek and Lake Fork of the Gunnison River. :3treamf low records <br />arE: available for 9 years, plus 1 year estim''tted (1921) on Henson <br />Cre:ek, and for 14 years (1918-1937) on Lake :Oork of the Gunnison <br />River, with the exception of years 1925-28 and 1930-31. The <br />gaging station on Henson Creek is located 1.~5 miles upstream <br />from its mouth (the drainage area equals 91 ';quare miles), and <br />the: gaging station on Lake Fork is 0.5 mile upstream of Henson <br />Creek confluence (drainage area equals 115 square miles). Table <br />1 e,hows the available recorded data for the Henson Creek gage. <br /> <br />4 <br />
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