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<br />XII-8 <br /> <br />that the problems associated with the large floodplain lakes could not be <br />adequately addressed within the existing scope of this projecta <br /> <br />Combinations <br />The combination alternative includes consideration and use of various com- <br />binations of the above alternatives to provide the best level of protection <br />at the least cost. The recommended alternative for each of the reaches will <br />be a combination of the above alternatives. For example, all alternatives <br />include consideration of floodplain regulation. Certain elements of the <br />other alternatives have been included in the limited structural improvements <br />alternative. In various reaches the limited structural improvement alterna- <br />tive includes lined channels and modified channel relocation. <br /> <br />This alternative for Reach 8 involved a combination of an engineered stable <br />channel and large gravel pit lakes. These lakes would be constructed across <br />the entire floodplain and would be approximately 1 mile long. No embankment <br />construction is associated with the lakes, however, the cost estimates would <br />include measures to insure the long-term stability against failure. In this <br />alternative, three subalternatives are studied; the la-year, 50-year and <br />100-year events. It differs from the "1 arge fl oodpl ain 1 akes" alternative <br />in that major dams designed to high hazard standards would not be included. <br />Between these large floodplain lakes, the engineered channel would convey <br />flows. The channel would be designed to the same criteria as in the engin- <br />eered stable channel alone. <br />