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held steady for a period sufficient to produce a reliable measurement (may be up to 12 hours) to allow for flows to stabilize. Estimated Cost: $16,000 Responsible Parties: USGS; Reclamation; National Park Service (NPS), Glen Canyon National Recreation Area (GCNRA); Western Area Power Administration (Western). Time to Complete: Data collection dependent upon availability of flows. Data analysis will be completed one month after data collection ends. 4. Development of technical hydraulic studies to address beach aggradation and degradation. Major Premise: Further understanding of the complex system of water and sediment movement through Grand Canyon and the erosion and deposition of sand in recirculation zones is required to provide the basis for decisions about beaches, native fish, wildlife, vegetation, and cultural resources. A beach surveying monitoring trip is necessary to document changes from 1980 to the present. Estimated Cost: $50,000 Responsible Parties: USGS, Reclamation, NPS, FWS. Time to Complete: 6 months 5. Cultural archeological resource analysis. Major Premise: Loss of cultural resources by the reinitiation of fluctuating flows and erosion along the river corridor is threatening important Grand Canyon National Park cultural resources along the river corridor. An archeological reconnaissance survey and impact report of these resources, prior to identifying actions, are necessary. Preserva- tion of natural and cultural resources within Grand Canyon National Park is legislated by Grand Canyon National Park Master Plan (1976), its accompanying final environmental assessment (FES 75-97), Grand Canyon Enlargement Act (Public Law 93-620), and Archeological Resources Protection Act of 1979 (Public Law 96-95). Estimated Cost: $18,000 7