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Last modified
11/23/2009 12:58:20 PM
Creation date
10/4/2006 9:54:37 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
93
County
Jefferson
Community
Lakewood
Stream Name
McIntyre Gulch
Title
Flood Hazard Area Delineation - McIntyre Gulch, Lakewood, CO
Date
10/1/1977
Designation Date
1/1/1978
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br />1 <br />1 <br />I <br />I <br />I <br />1 <br />I <br />I <br />I <br />I <br />1 <br />I <br />I <br />I <br />I <br />I <br />I <br />1 <br /> <br />capacity for the 2 year frequency flood. The channel is also crossed by <br />the Rocky Mountain Ditch in a flume on a trestle, just west of Carr Street. <br />The potential flood hazards consist of erosion, residential inundation, <br />interrupted traffic and services, loss of utilities, and a potential loss <br />of the 6" water line under Carr Street bridge and the sewer or gas line <br /> <br />The potential flood hazards in this reach consist of erosion, <br /> <br />commercial property inundation, commercial service interruption, and <br /> <br />above Meadowlark Drive due to high flow velocities. <br /> <br /> <br />Sheets 10 and 11: Carr Street to 6th Avenue (sta 32+30 to 11+75); <br /> <br />interrupted traffic and services. <br />Sheet 12: Union Blvd. to West Boundary F.C. (sta 15+50N to 0+0); <br />The channel in this reach is part of the North Branch of McIntyre <br />Gulch and consists of grass-lined trapezoidal section with check drops. <br />A detention pond (spillway under construction) has been constructed just <br />downstream of Union Blvd. The 100 year flood plain is contained within <br />the channel throughout the reach. The channel is crossed by Union Blvd. <br />(2 - 76" x 48" HE-RCP) with capacity for the 100 year frequency flood, <br />and by the Welch Ditch (83" x 53" HE-RCP). The outlet to the pond- consists <br />of a duck-billed spillway and an 83" x 53" HE-RCP, with capacity for the <br /> <br />The main channel in this reach is parabolic in shape with minor <br />meandering. The overbank area is fairly broad with varying section. <br />Considerable obstructions occur in the floodway including brush, debris, <br />fences, small sheds and buildings. The average slope of the channel is <br />1.9%. The channel is crossed by 6th Avenue in a triple wide II'S x 10'H <br />RCBC, with capacity to carry the 100 year flows. <br />The main channel generally has a capacity to carry approximately the <br />5 year storm frequency with high velocity flow. For storms with a frequency <br />of 10 years and greater, the floodway is very broad and deep and considerable <br />overbank flow occurs along the right bank. <br />The development in this reach consists mainly of single family residential <br />with large lots and prOVision for raising livestock. <br />The potential flood hazard in the reach consists of erosion, residenti~l <br /> <br />The channel in this reach is trapezoidal in shape with minor meandering <br /> <br />100 year flood. <br />The potential flood hazards in this reach consist of minor erosion <br />of the channel. <br />Sheet 13 and 14: South Side of Alameda from Taft Street to Moore Street <br />(sta 33+70A to 75+10A);~- ~', '.' '. <br />The channel in this reach is a V-shaped, grass-lined and shallow section <br />along the south shoulder of Alameda Avenue. The channel has two culverts <br />across Alameda Avenue, one (36" RCP) at Station 57+40 near Quail Street <br />with capacity less than the 10 year flood, the other (2 - 68" x 43" HERCP) <br />at station 35+20 near Moore Street with capacity less than the 100 year <br />flood. Eight roadway crossings interrupt the flows causing storm runoff to <br />overflow Alameda Avenue at each crossing during the 100 year flood. These <br />crossings are Swadley Street (50" x 31" Arch CMP), Simms Street (12" CMP), <br />Robb Street (15" CMP), Queen Street (15" CMP), a service station access <br /> <br />inundation, and loss of livestock. <br />Sheet 11: 6th Avenue to Confluence (sta 11+75 to 0+0); <br /> <br />and obstructions. The average channel slope is 1.5%. The flood plain is <br />generally contained within the channel with high velocity flows, except <br />for an area near the commercial development, where shallow flooding along the <br />right bank area occurs for storms greater than a 10 year frequency. <br /> <br />11 <br />
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