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Last modified
1/26/2010 4:15:49 PM
Creation date
4/22/2007 10:20:58 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8230.400.21.B.6
Description
CO River Lit - Div 4 Water Court - Steamboat RICD - Water Court Filing - Expert Reports
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
11/1/1998
Author
Various
Title
Expert Reports 1998-2005 - RE-Steamboat RICD - Case Number 03-CW-86 - 11-01-98 through 08-17-05
Water Supply Pro - Doc Type
Report/Study
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<br />. <br /> <br />. <br /> <br />. <br /> <br />('~ :,'1 ~~. (~1 , / <br />u u " \.) '1'1: <br /> <br />Wetted Perimeter Method <br />The Wetted Perimeter Method, like R2CROSS, is an example of a habitat retention, standard <br />setting model. This method is routinely utilized in six states (Figure 1). <br /> <br />Wetted perimeter is the linear distance along the stream channel bottom that is covered with <br />water (Figure 3). It requires quantification of the relationship between wetted perimeter and <br />streamflow (Figure 4). This relationship may be derived empirically from multiple channel <br />geometry-discharge field measurements or modeled hydraulically from a single, channel geometry- <br />discharge dataset. A Wetted Perimeter instream flow recommendation is determined by locating the <br />inflection point ofthe wetted perimeter-discharge relationship (Nelson 1980, Stalnaker et al. 1995). <br /> <br />The methodology uses wetted perimeter as an index of habitat quality to estimate a desired <br />instream flow value. Channel geometry-discharge field data is collected in a critical habitat area, <br />most often a riffle. The critical habitat type serves as an index of habitat for the rest of the stream. <br />The method relies on the assumption that preserving the wetted perimeter in a critical habitat area <br /> <br />Figure 3. Wetted Perimeter defined. <br /> <br />Vertical Distance (ft) <br />o <br /> <br />(10) <br /> <br />(2) <br /> <br />Dry <br />Slreembank <br /> <br /> <br />(4) <br /> <br />Watef Surface Elevallon <br /> <br />(6) <br /> <br />Wetted Perimetaf ~ <br />r = Total Distance of Bold Line) <br /> <br />(8) <br /> <br />, <br /> <br />o <br /> <br />4 <br /> <br />8 12 16 20 24 28 <br />Horizontal Distance (ft) <br /> <br />32 <br /> <br />36 <br /> <br />10 <br />
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