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Last modified
1/25/2010 6:45:32 PM
Creation date
10/5/2006 12:24:04 AM
Metadata
Fields
Template:
Floodplain Documents
County
Larimer
Community
Fort Collins
Stream Name
Fort Collins Floodplains
Basin
South Platte
Title
Guidelines for the Management and Administration of Floodplains City of Fort Collins
Date
10/17/1995
Prepared For
Fort Collins
Prepared By
Fort Collins Stormwater Utility
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />13. Cooper Slough Implementation Plan, prepared by Simons, Li, and Associates, dated <br />October 1987. Not officially adopted. <br /> <br />14. Cache La Poudre River Master Drainageway Plan, prepared by Resource Consultants <br />Inc., in review. <br /> <br />Channel Stability Studies <br /> <br />In addition to overbank flooding and 100,year floodplain delineation, the Stormwater <br />Department has conducted studies on channel stability and delineation of erosion buffer zones <br />along certain channels. In particular, the Fossil Creek basin has a number of supplemental studies <br />to the Master Drainageway Plan. <br /> <br />Fossil Creek is generally incised into valley fill and/or bedrock and is characterized by steep <br />banks, a compound channel, meandering plan form, general vertical and/or lateral instability, and <br />a highly variable discharge regime. Although the Cache La Poudre, Spring Creek, and other <br />streams in Fort Collins may also have channel sfabili1y problems, the instability is usually <br />limited to a certain reach(es) of stream and may be associated with man,made structures or <br />channel modifications. Channel instability assOi:iatecl with Fossil Creek is generally inherent in <br />the system, however, the response of the system may bt: altered as a result of increased <br />storm water and sediment runoff associated with development <br /> <br />Fossil Creek, like other rivers in semi-arid environments and the Plains,Piedmont of Colorado, <br />has different structures for temporal and spatial change than rivers such as the Cache La Poudre. <br />The concept of a system operating in a manner that establishes and maintains an equilibrium <br />condition usually takes the form of a presumed balance among hydraulic forces, material <br />resistances, and morphology of the fluvial system. The maintenance of an equilibrium condition <br />is facilitated by the nearly continuous operation of streamflows in rivers such as the Cache La <br />Poudre. <br /> <br />Because Fossil Creek is characterized by a highly variable discharge regime, the long,term <br />tendency toward equilibrium may be disrupted. The wide fluctuations in discharge that can occur <br />over short periods of time imply that fluvial systems, such as Fossil Creek, cannot operate on a <br />continuous basis and that trends toward a process,fonn equilibrium are unlikely completed. The <br />radical short,term variations in discharge result in a system operation that is pseudo catastrophic <br />in that very large discharges drastically alter the channel morphology to a new configuration <br />suited to high flow, but that is not in equilibrium with subsequent low flows. The resulting <br />compound channel (low, flow pilot channel nested in a larger channel) may have two entirely <br />different behavior patterns depending on the discharge conditions, with intermediate discharges <br />causing damage through erosion even though overbarLk flow does not occur. <br /> <br />23 <br /> <br />'" <br />
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