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Impact of Forest Service Activities on Stream Flow
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Impact of Forest Service Activities on Stream Flow
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Last modified
1/26/2010 4:41:00 PM
Creation date
7/20/2009 11:44:54 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8461.250
Description
Water Issues
State
CO
Basin
South Platte
Water Division
1
Date
5/22/2003
Author
Charles A. Troendle, James M. Nankervis, Laurie S. Porth
Title
Impact of Forest Service Activities on Stream Flow
Water Supply Pro - Doc Type
Report/Study
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I -) s . '_ <br />The Impact of Forest Service Activities on the Stream Flow Regime <br />in the Platte River <br />C. A. Troendle, J. M. Nankervis, and L. S. Port6 <br />This report addresses an expansion of the eazlier effort by Troendle and Nankervis (2000) to <br />assess the long-term impacts of Forest Service activity in the North Platte River Basin on water <br />yield from the basin. Two primary tasks are associated with this effort. The first task involves <br />developing a protocol for predicting, or modeling, the consequence of present and future Forest <br />Service management activities on water yield from the North Platte Basin. For this task, the <br />description of forest stands provided to J.M. Nankervis and C.A. Troendle by Region 2 as part of <br />the May 12, 2000 Report: "Estimating Additional Water Yield From Changes in Management of <br />National Forests in the North Platte Basin", is understood to represent an initial characterization <br />of current conditions on Forest Service land in the North Platte drainage and also indexes 1997 <br />as the reference point, or baseline, for documenting the effect of future management activities on <br />water yield. The second task involved identifying reference gauging sites (stream flow, <br />precipitation, and snow pack accumulation), in both the North and South Platte River basins, that <br />will be useful in documenting the future effects, if any, of management impacts on measured, or <br />actual, stream flow. <br />Objectives <br />The primary focus of the first task was to establish and implement a protocol for projecting the <br />impacts of vegetation management and natural disturbance on future water yield from Forest <br />Service lands in the North Platte River Basin. It is assumed that the database developed to <br />describe vegetative condition in the Troendle and Nankervis (2000) report to the Bureau of <br />Reclamation represents the best available description of 1997 base line conditions for both forest <br />vegetation and streamflow. The original data, describing forest condition, contained <br />approximately 23,000 separate polygons of information. In order to reduce the size of the data <br />set to facilitate the modeling efFort used in the 2000 analysis, similar polygons (based on slope, <br />aspect, precipitation zone, cover type, age class) were aggregated. Although aggregation <br />facilitated the modeling process, by reducing the size of the database, the spatial uniqueness of <br />the individual polygons was lost. In this current effort, the original database was projected on a <br />GIS platform allowing the spatial visualization of forest and non-forest lands as a function of <br />specie composition, age class, and management class to be maintained. Other GIS data layers, <br />such as aspect, slope, precipitation, and management activity were intersected to better <br />characterize, and track, each of the original polygons. In addition to the more robust data display <br />associated with this analysis, the following sub tasks were also completed as part of Task 1: <br />a) Current stand conditions were projected into the future for one 20-year time cycle to <br />evaluate the effect of a no human intervention / no natural disturbance scenario on future <br />water yield (ca 2017). This scenario simulates the return of all current (ca 1997) <br />forestlands towards a state of complete hydrologic utilization.
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