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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
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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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make documenting the role of vegetation on stream flow response at the <br />landscape level a difficult and often misleading task. <br />For example, Burton (1997) used USGS stream flow records to assess the <br />cumulative impact of timber harvest activities (which occurred over a 12- <br />year period) on stream flow from Brownie Creek in Utah. Using the North <br />Fork of Dry Creek as the control, Burton (1997) compared the flow for the <br />pre - harvest period (1951 -1960) with the flow for the harvest/post - harvest <br />period (1961 -1980) for both watersheds and found flow for the 1961 -1980 <br />period was significantly greater on Brownie Creek. He concluded the <br />increase was a response to timber harvest. Troendle and Stednick (1999), in <br />a reanalysis of the same data found moving the streamgage location on <br />Brownie Creek in 1960 was more likely the cause of the abrupt change in <br />measured flow (figure 10). The abrupt flow change Burton (1997) detected <br />did occur, but it occurred entirely in 1960 as an artifact of relocating the <br />streamgage and not a reflection of the timber harvest operations that <br />occurred over the next 12 -year period (1960- 1972). If harvesting were the <br />cause of departure, the change would have been subtle and accumulative <br />over the 12 -year period; opposite of the trend in figure 9. <br />Figure 10 presents a comparison of the cumulative flow from Brownie Creek <br />plotted over that from North Fork Dry Creek. In 1960, an abrupt change in <br />the relationship between the two streams occurred as an artifact of <br />streamgage relocation. Because the line is quite linear from 1960 to 1980, <br />one cannot conclude that further increases in flow occurred as a result of the <br />continuous harvesting activities that occurred from 1961 -1972. If timber <br />harvest caused the change, one would expect to see a gradual arc evident in <br />the double -mass plot (figure 10). <br />Leaf (1999) used a combination of long -term USGS stream flow data and <br />NRCS snow - course data to document what he also considered to be the <br />long -term effect of vegetative re- growth or in- growth, causing diminished <br />stream flow in the North Platte River Basin. Leaf (1999) utilized records <br />from the North Platte River at Saratoga, Wyoming, the North Platte River at <br />Northgate, Colorado, and the Laramie River at Woods Landing, Wyoming. <br />In his Table 3, Leaf (1999) summarized analysis of the three gauge records <br />and documents decreases in flow at all three stream gauging stations. His <br />inference is that increased forest density caused a measurable decrease in <br />stream flow. There is no question that increases in forest density cause a <br />19 <br />
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