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Estimating Additional Water Yield From Changes in Management of National Forests in the North Platte Basin
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Estimating Additional Water Yield From Changes in Management of National Forests in the North Platte Basin
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3/29/2013 2:57:42 PM
Creation date
3/6/2013 10:50:04 AM
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Water Supply Protection
Description
An Independent Report Prepared for the Platte River EIS Office U.S. Department of the Interior Related to Platte River Endangered Species Partnership (aka Platte River Recovery Implementation Program or PRRIP),
State
CO
NE
WY
Basin
North Platte
Water Division
6
Date
5/12/2000
Author
Charles A. Troendle, Matcom Corporation & James M. Nankervis, Blue Mountain Consultants
Title
Estimating Additional Water Yield from Changes in Management of Ntional Forests in the North Platte Bains, Final Report
Water Supply Pro - Doc Type
Report/Study
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Prior to selecting Coon Creek, an intensive search for a suitable area was <br />made throughout Region 2 and a portion of Region 3 of the Forest Service. <br />Initially, it was hoped that an area could be selected that involved ownership <br />by several government agencies, the state, and the private sector — a true <br />partnership. Initial discussions in the late 1970's and the early 1980's <br />included the Denver Water Department, USDI Bureau of Land Management <br />(BLM), USDA Soil Conservation Service (now NRCS), Colorado Division <br />of Wildlife, Colorado Forest Service, and the State Engineer's Offices in <br />Colorado and Arizona, as well as the Regional Foresters in Regions 2 and 3 <br />(Troendle 1990). As the search for a site proceeded, the site in Wyoming <br />proved to be the only site available to meet technical objectives of the <br />demonstration. In contrast to the perception that extensive areas exist for the <br />application of the water yield technology, search for the demonstration site <br />presents testimony to the fact extensive land areas suitable for water yield <br />augmentation are not readily available on National Forest System (NFS) <br />lands in the inland west. <br />Coon Creek, the treatment watershed, is a 4133 acre drainage located in the <br />Sierra Madre Range on the Hayden District of the Medicine Bow National <br />Forest (MBNF) in Wyoming. In 1982, 8 -foot Cipoletti weirs were <br />constructed on each drainage to monitor stream flow. By 1987, a suitable <br />calibration had been achieved (Bevenger and Troendle 1987) and design and <br />implementation of the treatment began. Initially the intent was to harvest <br />approximately one -third of the Coon Creek watershed, as was done in <br />research at Fraser Experimental Forest. However, this was an operational <br />effort and technical considerations, as well as compliance with resource <br />constraints imposed by the MBNF Forest Plan (primarily for minimizing <br />impairment of visual quality as well as riparian and old- growth protection), <br />reduced the opportunity for harvest. Although minimal in nature, these <br />considerations and constraints resulted in only 24 percent of the watershed <br />area actually being impacted by either road construction or timber harvest. <br />Although the length of the post - treatment record for Coon Creek is short (5 <br />years), the impact the treatment had on seasonal water yield is quite clear. <br />Removal of vegetation from 23.7 percent of the area significantly increased <br />flow by an average of 3.0 inches (Troendle et al. 1998). The increase is <br />proportionally consistent with what has been observed to occur on small <br />experimental watersheds elsewhere, and extrapolation of empirical estimates <br />of change, based on process research at the Fraser Experimental Forest <br />I(Troendle and Reuss 1997), compare well with the observed changes at <br />1 15 <br />
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