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FLOOD03098
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Last modified
1/25/2010 6:26:18 PM
Creation date
10/4/2006 11:26:42 PM
Metadata
Fields
Template:
Floodplain Documents
County
Larimer
Community
Fort Collins
Stream Name
Cooper Slough, Boxelder Creek
Basin
South Platte
Title
Master Drainageway Planning Study
Date
8/1/1981
Prepared For
Larimer County
Prepared By
Simons Li & Associates Inc.
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br /> <br />I <br /> <br />completed and the fifth is under construction. The present study is concerned <br />with runQffgenerated below the Soil conservation Service structures and resi- <br />dual flow from the structures. There are no flood control structures located <br />in the Cooper S~ough basin. <br />The study area for Cooper Slough is within the Urban Growth Area boundary <br />and the area is cundergoing development. Only the upper mile of the Boxelder <br />Creek study area is outside the Urban Growth Area boundary. For the purpose <br />of analyzing the Boxelder Creek and Cooper Slough drainage characteristics, <br />the study area WaS divided into reaches. The limits of each reach are as <br />follows: <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Cooper Slough: Reach 1 - Boxelder Creek confluence to" State Highway 14 <br /> <br />I <br /> <br />Reach 2 - State Highway 14 to center line of Section 4, <br />T7N, R68W <br /> <br />I <br /> <br />Boxelder Creek: Reach 1 - Cache la poudre River confluence to Cooper <br />Slough confluence <br /> <br />I <br /> <br />Reach 2 - Cooper Slough confluence to State Highway 14 <br /> <br />Reach 3 - State Highway 14 to north line of Section 3, <br />T7N, R68W (Willox Lane) <br /> <br />I <br /> <br />The reaches are located in Figure 2 and described individually below. <br /> <br /> <br />Cooper Slough Reach 1: The land uses in this reach include commercial, <br /> <br />residential and agricultural. Topography within this reach is generally flat <br /> <br /> <br />with Lake Canal and Cache la poudre Reservoir Inlet crossing the reach. <br /> <br /> <br />Drainage patterns within the reach are poorly defined, except the drainageway <br /> <br /> <br />directly south of the culvert under State Highway 14. The'drainageway has <br /> <br /> <br />very limited capacity. Storm water will cover a wide area south of State <br /> <br /> <br />High~ay 14 and would eventually drain into Boxelder Creek along the banks of <br /> <br />Lake Canal and Cache la Poudre Reservoir Inlet. <br /> <br /> <br />Cooper Slough Reach 2: The land uses in this reach ,include commercial, <br /> <br /> <br />industrial and agricultural. Topography within this reach is also flat with <br /> <br /> <br />poorly defined drainage patterns. Larimer and Weld Canal, Colorado and <br /> <br /> <br />Southern Railroad and State Highway 14 restrict the drainageway creating <br /> <br /> <br />ponding of storm water. The existing cooper Slough channel has only limited <br /> <br /> <br />capacity. Storm water will also cover a wide area between State Highway 14 <br /> <br /> <br />and Vine Drive due to limited channel capacity, undefined drainage pattern and <br /> <br />flat topography. Natural detention storages exist at State Highway 14, <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br />II <br />II <br /> <br />I <br /> <br />8 <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Colorado and Southern Railroad and Vine Drive but the available storage <br />volumes wouln not be large enough to ~educe peak runoff rates during major <br />floods. <br /> <br />I <br /> <br />Boxelder Creek Reach 1: The land use in this reach is mostly agricul- <br /> <br /> <br />tural with a small area zoned commercial. The drainageway is a narrow, well <br /> <br /> <br />defined channel with steep banks. The channel is perched and has limited <br /> <br />capacity, however, the floodplain adjacent to the channel does not become too <br /> <br /> <br />wide because storm water leaves the channel at some locations once the channel <br /> <br />capacity is exceeded. Cooper Slough joins Boxelder Creek between Lake Canal <br /> <br /> <br />and Cache la Poudre Reservoir Inlet. A natural storage exists between these <br /> <br />two canals due to the high embankment of Cache la Poudre Reservoir Inlet. <br /> <br /> <br />Boxelder Creek Reach 2: The land uses in this reach also include commer- <br /> <br /> <br />cial and agriculture. The drainageway is generally shallow and wide, however, <br /> <br /> <br />it is well defined. I-25 would backup the flow and force some storm water to <br /> <br /> <br />leave the main channel of Boxelder Creek. The floodplain width in this reach <br /> <br />is generally uniform because the channel and overbank area are uniform <br /> <br />throughout the reach. <br /> <br /> <br />Boxelder Creek 3: The land uses in this reach include commercial, resi- <br /> <br />dential, multiple family, industrial and agricultural. The drainageway in <br /> <br /> <br />this reach is generally shallow but well defined. Natural detention storage <br /> <br /> <br />exists at Colorado and Southern Railroad and Larimer and Weld Canal because of <br /> <br /> <br />their high embankments. The existing storage does not have enough volume to <br /> <br />reduce peak runoff during major floods. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Irrigation Ditches, Roads and Railroads <br /> <br /> <br />The Larimer-Weld Canal (Eaton Ditch), Lake Canal, and the Cache la poudre <br /> <br />Reservoir Inlet cross both drainageways in the study araa. During major <br /> <br /> <br />floods, there is a possibility that storm water may overtop the banks of the <br /> <br /> <br />canals, causing extensive damage to the canals. The canal crossings may also <br /> <br /> <br />impede flood flows causing backwater conditions upstream. <br /> <br /> <br />The Colorado and South~rn Railroad also crosses the study area, as do <br /> <br /> <br />several major roads including I-25, Colorado State Highway 14, Vine Drive and <br /> <br /> <br />Prospect Street. Many of these roads do not have adequate capacity to pass <br /> <br /> <br />peak flows from major floods, and will obstruct flood flows. Culverts under <br /> <br /> <br />private roads are undersized and probably will wash out during major floods <br /> <br />because they are not well constructed. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />9 <br /> <br />, <br /> <br />I <br />
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