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<br />Alamosa-La Jara Water Conservancy District <br />January 26-27, 2000 <br /> <br />Agenda Item 12b. <br /> <br />Certain sections of this stretch of river will have to undergo reconstruction, as set forth in the <br />Conceptual Design by Dave Rosgen. Priority areas are those "locations that pose the greatest <br />threat to land loss and downstream sedimentation (large sediment source)." Thl~se areas of <br />the river have severely eroded stream banks and show lateral migration of the river, rHsulting in: <br /> <br />. Reduction of bedload transport <br />. Reduced water quality <br />. Loss of property <br />. Lowered water table <br />. Bridge scour <br />. The need to reconstruct irrigation diversions <br />. Loss of wildlife habitat <br /> <br />Proiect Description <br /> <br />Desion <br />The ARWP committee will implement the Conceptual Design for the Alamosa Riller. This <br />design uses rock structures and channel shaping (whiclh involves re-establishment of existing <br />meanders and reconnection to the floodplain). Also included is the promotion of re-growth of <br />woody vegetation through plantings and cooperative efforts of river landowners to implement <br />grazing best management practices. Stream bank erosiion near bridge structures will also be <br />addressed during river restoration. <br /> <br />The design calls for reconnection of the river to its original floodplain and stabilization of the <br />river in either the same location or a suitable location. Oxbow lakes will be constructed to <br />prevent floods from re-occupying the previous down-cuI channel, and to increase the height of <br />the water table (see Figure 3, from Conceptual Design). <br /> <br /> <br />FL.\ S~1-1. <br />-r"{ f~ <br /> <br />Figure 3: River returned to original channel, and oxbow lake construction. <br />Priority Areas <br />The largest priority area identified in the Conceptual Design encompasses 4 miles of river in the <br />vicinity of the town of Capulin. Reaches on this portion of the river are listed as priority areas <br />because of the extreme instability and lateral spreading. Other priority areas that are highly <br />unstable are located in the 3.5-mile section upstream of Highway 285. <br /> <br />The Reconstruction Process <br />1. Obtain landowner consensus to do the reconstruction. <br /> <br />4 <br />