WSP06782

• File Number: 8220.101.10.C
• Description: Glen Canyon Dam/Lake Powell
• State: AZ
• Basin: Colorado Mainstem
• Date: 11/5/1998
• Title: The Grand Canyon Monitoring & Research Center Fiscal Year 2000-2004 Monitoring & Research Strategic Plan ‎(pp 1-87)‎
• Water Supply Pro - Doc Type: Report/Study

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108 associated with water quality monitoring and research will be described Wlder the biological
109 program area sections.
110 Streamflow and its direct relationship to the transport and deposition of fine and
111 coarse sediments are topics clearly linked to dam operations. The dynamic relation between
112 variable dam releases and downstream sediment storage and export in the mainstem
113 influences include:
114 I) recreational resource activities such as camping (system-wide quantity and quality of
115 campable beaches), river boating (downstream navigation of rapids in Grand Canyon
116 National Park, and upstream navigation by anglers through shallow reaches in Glen Canyon
117 National Recreation Area); 2) cultural resources, such as archeological sites that are
118 contained and preserved within fine-grained, pre-dam river terraces in key reaches of the
119 ecosystem that also provide habitat for culturally important plants and animals; and 3)
120 biological resources including plants, invertebrates and vertebrates that rely on sediment-
121 related features such as return-current channels [backwaters] and fine-grained terrestrial
122 substrates, or processes that limit inputs and storage of fines, such as primary production.
123 Monitoring and research efforts will concentrate on four aspects of water and
124 sediment, as follows:
125 I) Mainstem streamOow - and related dynamic fluvial processes that are driven
126 by dam releases and combined with tributary inputs within the context of the
127 geomorphic framework of the river and its tributary processes.
128 2) System-wide sediment budget -local and system-wide sediment inputs versus
129 storage and export to Lake Mead for both fine and coarse sediments, including
130 linked influences on mainstem turbidity and long-term trends in evolution of the
131 geomorphic framework of the mainstem ecosystem.
132 3) Interactions between hillslope and Ouvial processes - debris flow and
133 mainstem streamflow relations at and between fan-eddy complexes that relate to
134 navigation through rapids, and long and short-term changes in shoreline habitats
135 and channel substrates that structure the aquatic and terrestrial ecosystems, as
136 well as alterations to channel storage of sediment.

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November S. 1998
Second Draft - Do Not Cite, Photocopy, or DIstrIbute