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r <br />1 r ,. <br />_ ~ <br />• River inlet channel stability involving a possible jetty, riprap and other bank <br />stabilization measures. <br />• Sediment deposition/exclusion area and gated sediment return flow channel. <br />• Diversion gates to control inflow discharge. <br />• Inlet bridges and fish monitoring facilities. <br />• Inflow channel to the wetlands. <br />• Drainage channel for return flow to the river, capacity and location. <br />• Drainage channel gate for controlling return flow to the river and for controlling <br />water surface elevations in the wetlands. <br />It is recommended that a thorough examination of the sediment problems be conducted <br />to determine the potential need for sediment exclusion from the wetlands. The concern over <br />sediment inflow and deposition in the wetlands is the loss of potential water storage and fish <br />habitat in the wetlands over the long term. Sediment deposition may also occur in the channel <br />way from the inlet to the wetlands. Based on the potential for sediment deposition in the river <br />(9.5 ft of deposition on a sand bar at cross section E-17.5), sediment could choke the inlet area <br />or the channel way. It would be important to create an inlet design to limit sediment <br />deposition in or near the inlet. <br />Fines (silt and clay) can not be excluded from entering the wetlands.. It is <br />recommended. that an analysis involving the settling velocities of the fines and the <br />concentration of fines during peak flows be conducted to determine the potential loss of <br />wetlands water volume from fine deposition. It should be noted that a buildup of fines over <br />time would probably be undesirable. Flushing the wetlands would not he effective in removing <br />fine sediment deposits. <br />39 <br />