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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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Last modified
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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In general, the simulated trends in stream flow whether the result of <br />historical in- growth, simulated harvesting, or catastrophe appear consistent <br />with observed changes measured at the streamgage for treatments with a <br />comparable impact. The hydrologic model WRENSS appeared to perform <br />well when simulating the effects of fire, insect mortality, and timber harvest. <br />Simulations of hydrologic response to both clear cutting and partial cutting <br />compare well with observed changes in flow measured at the stream gauge, <br />for similar impacts. <br />r <br />It would seem unlikely that the simulated changes in flow following timer <br />harvest simulations would be detectable at any streamgage on the North <br />Platte River. Neither is it likely that the simulated increases in flow could <br />actually be detected as they exit NFS land, assuming a gauge were present to <br />monitor them. <br />It is conceivable that decreases in flow on the order of magnitude simulated <br />for the historical trend in forest cover could be detected downstream at a , <br />USGS gauge, if the gauge had an adequately long and consistent record. <br />Since most gauges (North Platte at Northgate and Mitchell, North Platte <br />below Whalen, etc.) were not initiated until the early 1900's, thus making N <br />detection of the flow reduction, as simulated, questionable. <br />Although we chose not to simulate the potential response to other <br />management scenarios, one can infer the relative impact of adding or <br />subtracting Suitable acres based on simulated responses for the acreage <br />currently available. One can also infer the impact of fully or partially <br />implementing the management alternatives or a modification of them. Costs, <br />in terms of water yield, can also be calculated as opportunity forgone for <br />exclusions for Wilderness, wildlife set asides, and so on. To the degree the <br />data set provided to us properly characterizes the vegetation, the historical <br />trend simulations are indicative of the cost, in water, of allowing vegetation <br />density to increase. Although we did not specifically address peak flows <br />and low flows, we would expect the nature of the simulated responses to fall <br />within the frequencies and distributions observed on experimental <br />watersheds. Except following fire at lower elevations (5 — 7,000 feet), we <br />would not expect peaks or low flows to be altered. <br />r <br />1 <br />
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