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WSPC03417
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Last modified
1/26/2010 11:35:00 AM
Creation date
10/9/2006 3:55:04 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8062
Description
Federal Water Rights - Colorado Litigation - National Forest ISF Claims - Division 2
State
CO
Basin
Statewide
Date
9/8/1997
Title
Materials of Interest - United States Report Disclosing Methodologies for Quantification of Organic Act Claims - Consolidated Subcase Number 63-25243
Water Supply Pro - Doc Type
Report/Study
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<br />00in'] <br /> <br />Executive Summary <br /> <br />The United States Department of Agriculture. Forest Service (Forest Service) has filed <br />claims for reserved water rights at twelve stream segments within the Snake River Basin in <br />Idaho. These stream segments are located on the Boise River, Little Slate Creek. Lochsa.River. <br />Lolo Creek, North Fork Clearwater, Rapid River, Red River, Selway River, South Fork Payette <br />River, South Fork Red River, South Fork Salmon River, and Valley Creek. <br /> <br />The purpose of the claims is to "secure favorable conditions of water flows" pursuant to <br />the Organic Administration Act of 1897; that is, to maintain properly functioning stream <br />channels that in the long-term retain the ability to pass flows and convey water to downstream <br />users, The stream flows that maintain properly functioning channels are referred to as channel <br />maintenance flows. <br /> <br />The concept of channel maintenance rests on principles established through observations <br />of natural river channel behavior. Over time a natural stream channel establishes a geometry that <br />reflects the quantity of water and size and characteristics of sediment delivered to it from the <br />watershed. Alluvial channels, composed of material deposited by the stream itself, are adjustable <br />and capable of altering their form as sediment and water delivery change. Channel adjustment <br />occurs by erosion, transport and deposition of material making up the bed and banks of the <br />channel. Sediment may be transported in two ways: sediment may be suspended in the flow, or <br />sediment may roll, jump or slide over the bed as bedload sediment." 2 In gravel bed streams, such <br />as stream segments related to these claims, bedload sediment transport is most important <br />because it is the predominant material in the bed and banks. <br /> <br />Where flow is insufficient to transport sediment delivered to the channel, sediment <br />accumulates, reducing channel size and its ability to convey water downstream, and promoting <br />increased flooding, Sedimentation and reduction of the ability of the channel to transmit flows <br />may also occur if flows are insufficient to prevent encroachment of vegetation. The process of <br />channel maintenance therefore involves the movement of sediment and water to sustain a <br />functioning channel. <br /> <br />The methodology for determining the minimum amount of water to maintain these <br />channels is based on an understanding of the hydrology, sediment transport processes and <br />channel characteristics at these claim sites and 19 fluvial process study sites. The claims rely <br />upon available historical records, and measurements initiated to develop these claims including: <br />streamflow, sediment transport, channel geometry, and channel substrate measurements. All of <br />the claim sites are associated with stream gaging stations operated by the United States <br />Geological Surveyor the Forest Service. This undertaking was one of the largest and most <br />intensive regional concentration of such measurements ever made. <br /> <br />I Suspended load refers to sediment carried for the most part in the water column and supponed by eddies <br />in the flow, <br />2 Bedload refers to sediment moving in frequent contact with the stream bed. <br /> <br />United Slates' Expert Report Disclosing Melhodologies for Quantification of OIganic Ad Claims CoosoIidaIlld Subc:ase No, 63-25243 <br />
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