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I 11 Bel-Aires that have not grown (or cannot grow larger). This is a significant point worthy of discussion here. , " ~ Pg. 114, C. 2, P. 2. We agree that "There is a dynamic interaction between water and plants in the riparian zone: the availability of water supports plants that could not otherwise survive in a desert climate, and the type of vegetation that survives reflects the water regime that supports it." please provide specific information to allow the reader to determine the relationship between elevation above sea level in riparian communities along the Colorado River in Grand Canyon and the river stage. Figure 111-28 is not detailed enough to provide this information to the reader. Given the aforementioned quote, this rudimentary detail seems critical to the presentation of existing conditions. Pg. 115, C. 1, P. 2. We agree that "Because of the dynamic interaction between riparian vegetation and water availability, changes in dam operations that change specific water-release patterns would be expected to affect the abundance and distribution of plants." Please provide factual information regarding the nature of the "...specific water-release patterns...". Given the dynamic interaction between water and riparian plants, these rudimentary detail seems critical to the presentation of existing conditions. ~ ~ " :~ ", Pg. 115, C. 2, P. 2. The acreage information on OHWZ and NHWZ vegetation are attributed as (Stevens unpublished data, 1992). The work done by the Bureau's biologist Mike pucherelli (1986, 1987) should provide additional information on acreage figures for OHWZ and NHWZ vegetation in Grand Canyon. Given the paucity of information, it seems imprudent to ignore potentially relevant data. :1 '.. Pg. 115, C. 2, P. 3. We agree that "reduced flood frequency (a change in water regime) has permitted upland plants to move into some OHWZ areas." >~'! :.-'1 Pg. 117, C. 1, P. 2. Please provide specific information to allow the reader to determine the relationship between elevation above sea level in riparian communities along the Colorado River in Grand Canyon and the river stage. The information referenced from stevens and Ayers (1991) is not detailed enough to provide this information to the reader. Given the dynamic interaction between water and riparian plants, these rudimentary detail seems critical to the presentation of existing conditions. " ~ ~ ~- ,":.1 '.- ',' ,.' Pg. 117, C. 2, P. 2. The document states "Thus, daily fluctuating releases from Glen Canyon Dam influence expansion of vegetation from the NHWZ to sites at lower elevations. II Two questions must be addressed to detail this discussion of existing conditions: 1) 26