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<br />
<br />AUGUST
<br />
<br />WATER.USE DATA FOR WATER RESOURCES MANAGEMENT
<br />AMERICAN WATER RESOVllCES ASSOCIATION
<br />
<br />1988
<br />
<br />The Use of Departure Analysis
<br />
<br />In Decision Makins
<br />
<br />Owen R. Williamsl, Stanley L. Ponce, Ph.D.l, and Alice E. Johnsl
<br />
<br />AB8TRACr: The effects of land management decisions upon other resource values are of
<br />increasing consequence as resources become more and more scarce. Land managers must be
<br />prepared to use the state of the science, imperfect though it may be, to make as nearly
<br />complete an analysis as is feasible to determine all resource impacts consequent to the
<br />implementation of a land management decision. A case study is presented to describe the
<br />DEPARTURE ANALYSIS methodology used by the National Park Service to make management
<br />evaluations of decisions affecting natural resources within units of the National Park
<br />Service. The methodology incorporates several studies which, in aggregate, examine the
<br />effects of various flow regimes upon the natural values of units of the National Park
<br />Service. 2
<br />
<br />Key Terms: Environmental Impact Assessment; Hydrologic Simulation; Instream Flow;
<br />Departure Analysis; Zion National Park.
<br />
<br />IlfmOOOcrIOIf
<br />
<br />The purpose of this paper is to describe a methodology for assessing water-related
<br />resource impacts which result from land management deciSions. The approach is called a
<br />Departure Analysis. The reader will be g1 ven an overview of the approach and an example
<br />of its application.
<br />
<br />lAND USE ARB ITS 1lELATI0If ro USOORCE VALUES
<br />
<br />As this planet becomes more populated, demands upon its limited resources increase.
<br />With increasing demands, resource scarcity becomes a greater limitation upon the land
<br />manager t s decision space. Decisions can no longer be made from a single resource
<br />perspective. Due to scarcity in resources and ecosystem complexity, a decision in one
<br />resource area is likely to affect other resources which, in turn, affect future
<br />decisions relative to these resources.
<br />
<br />1 Respectively, Acting Branch Chief, Division Chief, and Hydrologist, National Park
<br />Service; Water Resources Division; 301 S. Howes St. ,--Port Collins, CO 80521.
<br />
<br />2 The opinions 'expressed are those of the authors and may not necessarily reflect those
<br />of the USDI National Park Service or the U.S. Department of the Interior.
<br />
<br />447
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