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i spike flow for one week. This estimate does not include cost for proposed steady flow periods before and after the spike. , CHAPTER III 1 :'1 Pg. 82, C. 1, P. 1. This section should state why this is important to the river below the dam. Both nitrogen and phosphorus loads are reduced in reservoirs from their inflow values which changes the location primary (algae) production occurs and makes less nutrients available below a dam. Pg. 83, C. 2, P. 1. A fourth major change related to sediment should be mentioned. Reduced sediment allows greater productivity below dams than occurred at those locations pre-dam due to clearer water and greater light penetration to the bottom. Pg. 84, C. 1, P. 5. This should be related to dam operations. Floods (flows significantly greater than the maximum during normal operations) have a much greater effect on sand movement in the system than do normal dam operations. :"1 ~ ~; .\ , Pg. 84, C. 2, P. 1- construction, normal dam losses down the river but into the river. In contrast to the effects of dam operations have little effect on sand may cause movement of sand from beaches Pg. 93,' C. 2, P. 2. What information is available on number, location, and size of backwaters at different flows? Also, what is the definition of backwater used by hydrologists and biologists? what are the criteria which define an ideal backwater for native fish? For nonnative fish? Where are these criteria met in Grand Canyon? Pg. 95, C. 1, P. 1. What is the difference in erosional rates between Lee's Ferry and Phantom Ranch (Grand Canyon)? Pg. 95, C. 1, P. 5. What are the individual contributions of erosional mechanisms to total erosion from sand deposits (e.g., seepage, wind, waves, recreation, etc.)? What methods were valid for quantifying all sources of erosion and how accurate were the methods used? :~ <. .. . ~[ ~: , ;:.. " l:l' .~~ Pg. ~5, C. 2, P. 1. What is the contribution of up- and down- ramp~ng to erosion in the form of various types of erosion (e.g., longer upramping time may extend exposure time to wave action, etc. )7 Pg. 96, C. 2, P. 3. What analysis was done of the individual contributions of tractive, wind, human incursion, boat-caused wave action, etc., impacts to erosion? What are the interactive 20