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Last modified
1/26/2010 10:07:50 AM
Creation date
10/5/2006 4:04:05 AM
Metadata
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Template:
Floodplain Documents
County
Statewide
Community
Statewide
Basin
Statewide
Title
Statewide River Rehabilitation and Flood Plain Management Needs Inventory
Date
2/18/1998
Prepared For
State of Colorado
Prepared By
McLaughlin Water Engineers, Ltd.
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 />I <br />I <br />I <br />I <br /> <br />suitable design criteria developed. Therefore, the classification method takes various combinations of <br />mobility and stream power and establishes a class identification. This identification is associated with <br />stream pattern (meandering or braided) and type of bed material sediment transport. <br /> <br />PROJECT SCREENING <br /> <br />Figure 2 illustrates the potential domain for project planning and execution, When few resources are <br />available (to the right on the horizontal axis), knowledge of river behavior can produce some success but <br />success or failure is still largely the result of natural processes and events. When ample resources are <br />available (to the left on the horiwntal axis), the river system is often manipulated or influenced by man. <br /> <br />For many communities, resources combined with a good knowledge (to the top of the vertical axis) of the <br />physical processes within the river system provides a prudent solution. This approach is lower in total <br />constructed cost and can be as successful as projects that are much more costly. Funding of projects in <br />this range allows for more projects over time, fulfilling a broader need. <br /> <br />Of course, communities may gamble with limited resources using only limited knowledge of the river <br />environment. Depending on the inherent risk within the river form, chances for success may range from <br />fair to poor. On average, projects of this type will fail far more often compared to similarly funded <br />projects that are based on more knowledge of the river environment. <br /> <br />COMMUNICATION <br /> <br />Because rivers are complex, the cost and technical expertise required to complete a restoration will vary. <br />Over time, it will be of interest to funding agencies and participating communities to accumulate design <br />knowledge that is well suited to particular types of stream channels and poorly suited to other types. In <br />particular, information on the cost of planning, design, and construction of projects will aid in budgeting <br />for future years. <br /> <br />Technical information on structural and non-structural approaches, design tools, construction standards, <br />methods of data collection, permit requirements, revegetation methods, and much more information is <br />needed. The associated stream classification is a relatively easy means of organizing this information. <br /> <br />With the aid of computer systems for Geographical Information (GIS) and Internet communication, it is <br />expected that much of this information can be shared with communities, many of whom would not <br />otherwise have such information. Stream classification can become the first step for a community to <br />undertake the data collection and analysis to plan for stream rehabilitation projects. Appendix B presents <br />a simplified Classification System to serve as a screening method for Colorado streams. <br /> <br />VI-3 <br /> <br />97..Q6().()Ol <br />
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