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<br /> <br />0J2173 <br /> <br />31 <br /> <br />THE PHYSICAL RESOURCES PROGRAM <br /> <br />Background and Introduction <br /> <br />Hydrology and sediment are the two primary resources of concern in the physical <br /> <br />resources area, although impacts from Glen Canyon Dam operations on these physical resources <br /> <br />also eXtend to other resources, such as biological and cultural. For the most part, FY 99 <br /> <br />monitoring and research efforts will represent an extension of FY 98 projects, and will continue <br /> <br />to focus on four areas of impact from dam operations as follows: <br /> <br />1. Influence of mainstem flows on sediment, and sediment related biophysical resource <br />interactions. <br /> <br />2. Sediment budgeting and geomorphic processes, including those related to active <br />sandbar processes that influence camping areas and terrestrial and aquatic habitats; <br />and pre-dam river terrace deposits containing cultural resources. <br /> <br />3. Inter-relationship between mainstem and tributary sediment and flows, with emphasis <br />on inputs from the Little Colorado and Paria Rivers, and physical impacts of <br />unregulated tributary debris flows on mainstem geomorphology and related <br />biophysical process interactions. <br /> <br />4. Influences of dam operations and natural tributary inflows on mainstem hydrology and <br />sediment transport with respect to resource concerns of the Upper Lake Mead delta <br />and related habitats, such as that of the southwest willow flycatcher. <br /> <br />Identified Stakeholder Information Needs <br /> <br />A synopsis of the information needs in each physical resource area is presented in the <br /> <br />following text. These information needs were the primary basis for developing FY 98 monitoring <br /> <br />and research programs for the GCMRC. They are also the basis for continuation of FY 98 <br /> <br />physical science activities with minimal modifications through at least FY 99, and will provide <br /> <br />information on the best approach for designing a revised long-term monitoring program <br /> <br />beginning in FY 2000 and beyond: <br /> <br />Final Draft - (12/15/97) For AMWG Review <br />