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WSP11913
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WSP11913
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Last modified
1/26/2010 3:19:16 PM
Creation date
10/12/2006 5:16:45 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.101.08
Description
Glen Canyon Dam/Lake Powell
State
AZ
Basin
Colorado Mainstem
Date
8/29/2000
Title
Summary & Discussion of Recent Research Findings Related to Dam Operations & Sand Bar Resources of the Colorado River Ecosystem
Water Supply Pro - Doc Type
Report/Study
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<br />I' <br />.< <br />'.. <br />a, <br />." <br />,,:, <br /> <br />,., <br /> <br />, <br />," <br /> <br />Attachment 1. Management objectives for sediment resources within the Glen Canyon Dam <br />Adaptive Management Program are stated as follows in the June 10, 1998 Management <br />Objectives document adopted by the Adaptive Management Work Group, <br /> <br />:,,'1 <br />~, <br />" <br />ft <br /> <br />:.., <br />tr <br /> <br />'"-': <br /> <br />SEDIMENT RESOURCES <br /> <br />Goal: to maintain a range of sediment deposits over the long-term, including an <br />annually flooded bare-sediment (un vegetated) active zone, a less frequently flooded vegetated <br />zone, terraces (within the 45,000 cfs river stage), and backwater channels. Managing sediment <br />resources will be on a reach-scale basis. Should signiflc3nt and localized adverse impacts <br />occur, site-specific mitigation would be considered_ <br /> <br />." <br /> <br />Definition: Sediment resources include a broad array of material, ranging from <br />suspended fines to coarse gravels, Primary interest relates to both material in suspension, <br />which affects benthic capability, as well as stored sediment in beaches and channel margins, <br />which affects recreation, <br /> <br />..;. <br /> <br />',' <br /> <br />~". <br />~-t) <br />. . <br /> <br />MANAGEMENT OBJECTIVES <br /> <br />~ <br />~r: <br />~~~ <br />1.) <br />.~( <br /> <br />MO 1: Maintain a long-term balance of river-stored sand to support maintenance flow (in years <br />of low reservoir storage), beachlhabitat-building flow (in years of high reservoir storage), and <br />unscheduled flood flows. Maintain system dynamics and disturbance by annually (in years <br />which Lake Powell water storage is low) redistributing sand stored in the river channel and <br />eddies to areas inundated by river flows between 20,000 cfs and maximum power plant <br />capacity, <br /> <br />,.." <br /> <br />~. .: <br />'.,;- <br />t'" <br /> <br />~~:,. <br />f..: <br /> <br />MO 2: As a minimum for each reach, maintain the number and average size (area and <br />thickness) of sandbars and backwaters between the stages associated with flows of 8,000 and <br />45,000 cfs that existed during the 1990/91 research flows. <br /> <br />MO 3: Periodically increase the average size of sandbars above the 20,000 cfs river stage and <br />number and average size of backwaters to the amounts measured during the high period of <br />1990/91 or the 1996 test of the beachlhabitat-building flow in as many years as reservoir and <br />downstream conditions allow, <br /> <br />. <br /> <br />;.;. ~. <br /> <br />RECREATION <br /> <br />:_\~" <br />I';c...~ <br />..... <br />" " <br />.;> <br />1'...;: <br />lk <br />l" .~. <br />.~ ._,' <br />"''- <br />;::~';~ <br />~r~ <br />I <br /> <br />,'. <br /> <br />MlAi Maintain system dynamics and disturbance by redistributing sand stored in the river <br />channel and eddies to areas inundated by river flows up to 45,000 cfs in as many years as <br />possible when BHBF hydro logic and resource criteria are met. <br /> <br />MANAGEMENT OBJECTIVES <br /> <br />.>', <br />.:'....:v <br /> <br />. i: I <br /> <br />MO 2: Maintain flows (under approved operating criteria) and sediment processes that create <br />an adequate quantity, distribution and variety of beaches for camping, as long as such flows are <br />consistent with management of natural recreation and cultural resource values (other natural <br />resource values), <br /> <br />9 <br />
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