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003573 25 IN 3.3 Define changes between 1990/91 and 1996 in sediment and backwater resources character and structure associated with dam operating criteria IN 304 Define all linkages, associations, interdependencies, etc., of physical sediment resource and backwater resources to biotic entities IN 3.5 Define processes necessary to maintain backwaters at 1990/91 or 1996 levels MO 4: Maintain system dynamics and disturbance by redistributing sand stored in the river channel and eddies to areas inundated by river flows up to 45,000 cfs in as many years as possible when BHBF hydrologic and resource criteria are met. IN 4.1 Define character and structure of all beaches and backwaters in system after 1996 test flows IN 4.2 Develop methodologies to define future flow regimes under approved operating criteria to maximize benefit to sediment and backwater character and structure IN 4.3 Develop an assessment of dam operations under approved operating criteria impacts on range of variation in sediment and other resources within Colorado River ecosystem and the associated processes that created these ranges Norm Henderson's Comments for Sediment Information Needs: IN 1. Quantify the available sediment in the river channel within the Glen Canyon reach to build beaches within Marble Canyon IN 2. Determine the relative importance of high terrace erosion to beach building within the Glen Canyon reach IN 3. Quantify the sediment inputs within the Glen Canyon reach from unregulated side channels IN 4. Assess the impact of current and anticipated dam operations under approved operating criteria on the high terraces within Glen Canyon. Define the relative importance of natural erosion of high terraces as compared to that experienced due to current dam operations IN 5. Develop an understanding of bed morphology dynamics within Glen Canyon Revised 6-10-98