Laserfiche WebLink
<br /> <br />002::'76 <br /> <br />34 <br /> <br />and the sediment budget of Marble Canyon. Cumulative inputs of fine sediment below the <br /> <br />confluence of the Little Colorado River may be sufficient to offset regulation effects, based on <br /> <br />existing information. <br /> <br />The following are areas incorporated into the FY 99 program related to overall sediment <br /> <br />availability and conditions of sediment resources: <br /> <br />1. Document planimetric changes in terrestrial sand bars, campsite areas and emergent <br />backwaters in targeted GlS reaches and relate changes in these resources to changes <br />in sediment availability and to dam operations between FY98 and FY99, as well as <br />mainstem and tributary floods, if and when inflows from the Paria or Little Colorado <br />Rivers, or releases from Glen Canyon Dam raise mainstem discharge above levels <br />associated with normal operations at the dam. <br /> <br />2. Document armual changes in pre-dam, terrace-based drainage areas containing <br />cultural exist in selected GlS reaches related to factors described above. <br /> <br />3. Defme armual changes in volume and particle-size distribution of channel-bed stored <br />sand between Glen Canyon Dam and Phantom Ranch (river mile 87, with emphasis <br />on sediment budgets for reaches above and below the Paria and Little Colorado River <br />confluences. <br /> <br />4. Determine armual changes in system-wide sediment budget based on all tributary <br />inputs of streamflow, and on sediment transport to Lake Mead driven by <br />combinations of ROD dam operations and tributary inflows. <br /> <br />Specific Physical Science Monitorinll and Research Projects SQpported bv GCMRC. <br /> <br />FY 98-FY 99: <br /> <br />The FY99 GCMRC physical-science program continues to focus on hydrology and <br /> <br />sediment transport, the physical processes related to those resources, and how they act <br /> <br />independently and together upon other resources under Record of Decision (ROD) dam <br /> <br />operations. Programmed monitoring and research, including synthesis of existing data, will <br /> <br />continue to focus on documenting changes in these resources through time. Science efforts <br /> <br />Final Draft - (12/15/97) For AMWG Review <br />