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Improving Drought Management in the West: the Role of Mitigation and Preparedness

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Improving Drought Management in the West: the Role of Mitigation and Preparedness Utah State University DigitalCommons@USU U.S. Government Documents (Utah Regional Elusive Documents Depository) 1997 Improving Drought Management in the West: The Role of Mitigation and Preparedness Donald Wilhite Follow this and additional works at: https://digitalcommons.usu.edu/elusive_docs Part of the Environmental Sciences Commons Recommended Citation Wilhite, Donald, "Improving Drought Management in the West: The Role of Mitigation and Preparedness" (1997). Elusive Documents. Paper 71. https://digitalcommons.usu.edu/elusive_docs/71 This Book is brought to you for free and open access by the U.S. Government Documents (Utah Regional Depository) at DigitalCommons@USU. It has been accepted for inclusion in Elusive Documents by an authorized administrator of DigitalCommons@USU. For more information, please contact [email protected]. ( PB97204283 . 'n l 1111111111111111111111111111111 \.... IDlproving Drought ManagelTIent in the West The Role 'of Mitigation and Preparedness Donald Wilhite, Director National Drought Mitigation Center University of Nebraska I I PROTECTED UNDE '-- I ! ALL RIGHTS RESER~~~TERNATIONAL COPYRIGHT I i ~~:'g~'1;~~~~~ 6~~~~6~ON SERVICE I I Report to the Western Water Policy Review Advisory Commission June 1997 Contents Page Introduction .................................................... 1 The Concept of Drought. .. .. 2 Crisis Management Versus Risk Management Approach to Drought Management . .. .. 4 The Climatology of Drought in the West: 1895 to 1996 " . .. 6 The Climatology of Drought, 1986 to 1996 . .. 8 State-Level Drought Planning: Current Status ...................... 15 Lessons From Recent Droughts: State-Level Mitigation Tools .... .. 19 Integrating Drought Management and Water Policy .................. 25 Integrating Drought Management and Water Policy: New Directions. .. 36 Australian National Drought Policy: A Model for the United States? ............................................. ;..... 38 Conclusions and .Recommendations ................................ (40 Bibliography ...... .. 43 Tables Page 1 Drought-related mitigative actions taken by States during recent droughts ............................................ 21 2 Possible risk-management and risk-minimization measures the . Federal Government could consider to lessen the effects of drought ................................................... 33 Figures Page 1 Percent area of the United States (48 contiguous States) in severe and extreme drought (i.e., :s;-3.0), 1895 to 1995 ................. .' .. 8 2 Percent area of: (a) Pacific Northwest Basin, (b) Missouri Basin, and (c) Upper Colorado Basin in severe and extreme drought (i.e., :s;-3.0), 1895 to 1995 ...................................... ·9· 3 Percent area of: (a) Great Basin, (b) California Basin, and (c) Lower Colorado Basin in severe and extreme drought (i.e., :s;-3.0), 1895 to 1995 . .. 10 4 Percent area of: (a) Arkansas-White-Red Basin, (b) Rio Grande Basin, and (c) Texas Gulf l3asin in severe and extreme drought (i.e., :s;-3.0), 1895 to 1995 . .. .. .. .. 11 5 Percent area of Souris-Red-Rainy Basin in severe and extreme drought (i.e., :s;-3.0), 1895 to 1995 . ... 12 6 Percent area of the United States (48 contiguous States) in severe and extreme drought (i.e., :s;-3.0), 1895 to 1995 . .. 12 7 Six-month SPI map for the end of March 1996 (representing the period October 1995 through March 1996) ............. follows 14 8 Palmer Drought Severity Index map, March 30,1996 ........ follows 14 9 Status of State drought plans, August 1996 . .. 16 ! Introduction Water is certainly one ofthe defining environmental {ssues in the West today. In a region marked by increasing and shifting population, increasing urbanization, changing trends and patterns of water use, changes in social behavior, and growing environmental awareness and concern, water is and will continue to be a primary source of conflict and controversy. It is imperative that we address these conflicts in a timely and systematic manner as they evolve and before they reach crisis proportions. Drought, a normal part of the climate for virtually all regions of the United States, is of particular concern in the West, where an interruption of the region's already limited water supplies for extended periods of time can produce devastating impacts. Historical records indicate that drought occurs somewhere in the West almost every year; however, multiyear droughts are of greatest concern to water planners, natural resource managers, and policymakers. The severe multiyear droughts that plagued the region during the 1930s and 1950s are now a distant memory for most. A recurrence of these multiyear droughts today would result in substantially greater and more varied impacts because of the rapid expansion and urbanization of the region's population during the past several decades and the associated increased pressure on water and other natural resources, even though there has been a significant increase ill water storage facilities and the application of water-conserving technologies. The severe drought of 1976 to 1977 in California, the Pacific Northwest, and other portions of the region demonstrated the continuing vulnerability of the region. This vulnerability became even more apparent during the period from 1987 to 1992, when some parts of the West experienced six or seven consecutive years of droug~t. Drought conditions returned to large portions of the region in 1994 (mainly California, the Pacific Northwest, and-the Great Basin States) and again in 1996 (mainly the Southwest and Southern Great Plains States). The 1996, drought caused significant impacts in agriculture and forestry and resulted in depleted reservoirs, increased groundwater , pumping, interruptions of public water supplies, and reduced recreational opportunities and tourism revenues. Environmental and social impacts were signiJicant, particularly the tremendous increase in forest and range fires, soil erosion, and effects on fish and wildlife populations. The Western Water Policy Review Advisory Commission (Commission) has been charged to conduct a "comprehensive review of Federal aCtivities in the 19 Western States which directly or indirectly affect the allocation and use of water resources, both surface and subsurface." Given that drought is a Improving Orought Management in the West: The Role of MiClgatlOn and Preparedness normal feature of the climate in the West, a critical element of this review process must be the future role of the Federal Government in preparing for and mitigating the effects of drought. Future policies and activities must include drought management as anintegral part of water management in the West; this will require an interagency approach that extends well beyond the traditional water mission agencies. The purpose of this report .to the Commission is to provide an overView and analysis of drought and drought management issues in the West and to propose recommendations for improving the coping capacity of the region. The report is divided into five sections. First, the concept of drought will be discussed to provide the reader with a greater awareness and understanding of this complex and insidious natural hazard. Second, the climatology of drought in the Nation and the region will be reviewed, particularly for the period since 1986. This will help place the recent series of dry years in a historical context. Third, the status of State drought planning effOrts will be reviewed, particularly in terms of the progress that has been made in the past decade. FOurth, the mitigative actions employed by States in response to " recent drought will be analyzed to demonstrate the wide range of options now available to address drought-related problems. Fifth, the results and recommen'dations of several recent studies will be reviewed and synthesized to determine the necessary next steps toward a more integrated approach (i.e., between levels of government) to drought and water management in the West and the Nation. The Concept of Drought Drought differs from other natural hazards in several ways. First, it is a "creeping phenomenon," making its onset and end difficult to determine. The effects of drought accumulate slowly over a considerable period of time and maY'linger for years after the termination of the "event. Second, the absence of a precise and universally accepted definition of drought adds to the confusion about whether or not a drought exists and, if it does, its sev.erity. Third, drought impacts are less obvious and spread over a larger geographical area than are damages that result from other natural hazards. Drought seldom results in structural damage. For these reasons, the quantification of impacts and the provision of disaster relief is a far more difficult task for drought than it is for other natural hazards. 2 The Concept of Drought Because drought affects so many economic and social sectors, scores of drought definitions have been developed by a variety of disciplin~s. In J addition, because drought occurs with varying frequency in nearly all regions of the globe, in all types of economic systems, and in developing and developed countries alike, the approaches taken to define it should be impact and region specific. The lack of a precise and objective definition in specific situations has been an obstacle to understanding drought, which has led to indecision and/or inaction on the part of managers, policymakers, and others. It must be accepted that the importance of drought lies in its impacts. Drought has been
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