Tuolumne River Report - U.S. Fish and Wildlife Service

TUOLUMNE RIVER TECHNICAL ADVISORY COMMITTEEHABITAT RESTORATION PLAN FOR THE LOWER TUOLUMNE RIVER CORRIDOR130Left bank looking downstreamRight bankRelative Elevation (ft)125120115110105100Construct floodplain, revegetate withcottonwoods and valley oaksRevegetate toe of berm witharroyo willow (shrub)FillBermCutPre-construction Ground SurfaceDesign Ground SurfacePre-construction Low-flow Water Surface5,400 cfs Pre-construction Water Surface5,400 cfs Post-construction Water SurfacePre-construction Pond SurfacePost-construction Pond surface9590MiningPitFill85-400 -350 -300 -250 -200 -150 -100 -50 0 50 100 150 200 250 300 350 400Distance from Left Bank Pin (ft)Figure 4-2. Proposed modification to berm confined channel morphology to improve flood conveyance and reducehabitat damage during large floods.120115Left bank lookingdownstreamRight bankCHAPTER 4Relative Elevation (ft)1101051009590TerracesFloodplainCutFloodplainTerraces85Pre Construction Ground SurfaceDesign Ground SurfaceFill invert to reverse years ofPre-construction Low-flow Water Surface80channel downcutting5,400 cfs Pre-construction Water Surface5,400 cfs Post-Construction Water Surface75-50 50 150 250 350 450 550 650 750 850 950 1050 1150 1250Distance From Left Bank Pin (ft)Figure 4-3. Proposed modification to riparian and/or agriculturally encroached channel morphology to improve floodconveyance and reduce habitat damage during large floods.152