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! .!("~ "..I l..- .,.,.. l'i..\). i~ l- , .'. , ~ , E. Saying, "similar to historical conditions", is vague. Tell what the historical conditions are? RESPONSE: We have followed your above suggestions and have expanded the definitions in both the Executive Summary and in Chapter 8. Idon't agree that maintaining a similar peak ofQ max timing to historical conditions will necessarily yield ascending and descending hydrograph limbs similar 10 historic conditions. You can achieve the date of Qmax by opening the gates completely for three days and then shutting them off which results in steep ascending and descending hydrograph limbs, or your could increase and decrease flows more gradually achieving the same date of Q max but with more gradual rising and falling hydrograph limbs. I think, if you want a rate of hydrograph rise and fall lhen providing rate of change of flow (e.g., + or - cfs/day) is what's needed (i.e. the ramp up and ramp down volumes ?). RESPONSE: Since Navajo Dam only controls about 50% of the flow in the area of concern, the nature of the release shape is influenced both by release ramp rates and timing of the peak. The result of this recommendation must be taken in the context of the other recommendations being met. Specifying the mean date and acceptable range of standard deviation is important to mimic the historic timing of the ascending and descending limbs. The language has been edited to include this qualification and make in clearer. Chapter 1 1.1. Correct use of fish versus fishes. RESPONSE: We have checked usage of these terms again throughout the document. 1.4. Try and cite more primary literature. Richter et al. 1998 (Reg. Rivers 14:329-340) and other papers of his cited therein are more credible than an abstract for an oral paper. Richter's papers preach the natural flow regime in a very articulate and convincing manner. RESPONSE: We have added better references per your suggestion. Chapter 2 2-26. "Production" was not either measured nor "estimated". Standing crop or biomass (gmlm') was measured. Production is a rate, e.g. gmIm'/day. Equating standing crop to production is similar to saying volume (cf) equals discharge (cfs). Call it biomass. RESPONSE: We have made this change. Chapter 3 3.3. P. 4. Saying temperature "was less variable" than date of spawning is somewhat misleading, particularly when you later say that photoperiod may be more important than temperature for cuing spawning. Its comparing apples and oranges. Just say temperature varied from 16 to 19C. RESPONSE: We have corrected this sentence to conform to the conclusions developed by Bestgen et al. (1998). 3-16. 1'd be a bit careful in implying studies from Lake Mohave are applicable to a riverine system without a word of caution. Research by Papoulias and Minckley (T AFS, 1989?) indicated starvation Comments and Responses Flow Recommendations Drah Report Galat - 5