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FLOOD05348
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FLOOD05348
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Last modified
1/25/2010 6:48:58 PM
Creation date
10/5/2006 1:28:39 AM
Metadata
Fields
Template:
Floodplain Documents
County
Boulder
Community
Boulder
Stream Name
Boulder Creek, Dry Creek
Basin
South Platte
Title
Flood Hazard Area Delineation
Date
6/1/1975
Prepared For
Boulder
Prepared By
UDFCD
Contract/PO #
&&
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />. <br />I <br />I <br />I <br /> <br />3 <br /> <br />Reference 100-Year <br />Point No. Station Flood Level <br />1 0+00 4947.3 <br />2 7+00 4949.2 <br />3 11+50 4950.2 <br />4 17+00 4952.9 <br />5 17+90 4952.9 <br />6 20+00 4953.3 <br />7 32+50 4955.9 <br />8 43+75 4960.3 <br />9 51+25 4963.4 <br />10 62+25 4963.9 <br />11 74+00 4970.2 <br />12 75+40 4970.4 <br />13' 78+50 4971. 0 <br />14 87+50 4975.9 <br />15 96+50 4978.6 <br />16 101+00 4981.0 <br />17 113+00 4984.9 <br />18 118+00 4986.1 <br />19 123+70 4986.1 <br />20 124+25 4986.7 <br />21 133+75 4991.2 <br />22 143+00 4995.7 <br />23 153+00 5000.3 <br />24 158+00 5001. 2 <br />25 163+50 5002.7 <br /> <br />Remarks <br /> <br />flow averages a depth of about 1.5 feet with a velocity of 2.2 <br />feet per second. Within the hazard area there are localized <br />islands or areas which stick up above the 100-year flood <br />elevation. These have been shown included within the hazard <br />area as they are completely surrounded by the flood plain and <br />their height above the flood elevation is such that erosion <br />and potential washout from the flood waters could occur. <br />Special considerations could be given to these areas to prevent <br />flooding should the need arise. <br /> <br />Table 1 <br /> <br />100-YEAR FLOOD I~ATER ELEVATIOnS <br />BOULDER CREEK <br /> <br />county Line Street <br /> <br />~1ineral Road <br /> <br />The upstream end of the study reach has been connected with <br />the previous study prepared by the Corps of Engineers in Augustl <br />1969. Flood waters entering the study reach are already into <br />the overbank area. The upstream crossing structure is a gravel <br />pit road which does not have adequate capacity to carry flood <br />waters and is nearly completely inundated by the floods. <br /> <br />Gravel Pit Road <br /> <br />At Kenosha Road, the next crossing structure downstream, <br />the bridge and a portion of the roadway are above flood eleva- <br />tion. On the left side of the river, the flood plain passes <br />beneath the bridge. The bridge and a small portion of the road <br />on the right side are also above the flood plain but have been <br />included within the flood hazard area. A second gravel pit road <br />bridge further downstream also is not capable of passing the <br />flood, although the top of the structure itself is well above <br />the flood plain. <br /> <br />Gravel Pit Road <br />ViS Study Limit <br /> <br />Mineral Road is well above the flood elevation and the <br />bridge has adequate capacity to pass flood waters through it. <br />Flood waters will pond upstream of the bridge, however. Imfledi- <br />ately below the bridge the water again leaves the banks, which <br />is partially caused by the County Line Road. The road is <br />within the flood hazard area and forms the downstream limit of <br />the study reach. <br /> <br />Kenosha Road <br /> <br />Drawings BI through B5 depict flood water elevations in <br />plan and profile and provide a continuous delineation of the <br />Boulder Creek flood hazard area. <br /> <br />C\) <br /> <br />Leonard Rice Consollrng Walel [ngrneelslllc <br />
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