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Environmental FlowsSaving Rivers in the Third Millennium$
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Angela H. Arthington

Print publication date: 2012

Print ISBN-13: 9780520273696

Published to California Scholarship Online: May 2013

DOI: 10.1525/california/9780520273696.001.0001

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Setting Limits to Hydrologic Alteration

Setting Limits to Hydrologic Alteration

(p.273) 19 Setting Limits to Hydrologic Alteration
Environmental Flows

Angela H. Arthington

University of California Press

In spite of tremendous advances, setting limits to hydrologic alteration of rivers, groundwater, and wetlands remains the core challenge for environmental flow science and management. Where should those responsible draw the boundaries of acceptable change in a river or estuary's flow regime, or a wetland's water regime? This chapter reviews recent developments. ELOHA and DRIFT aim to achieve a consensus around defining risks that are acceptable and those that are not, in the judgment of the participating stakeholders, who are informed by the best available science. These methods can be used to set a sustainability boundary or development space that limits the extent to which water withdrawals, water infrastructure operations, and land use can alter natural variability in water flows and water chemistry.

Keywords:   hydrologic alteration, limits, ELOHA, DRIFT, sustainability boundary, development space, best available science

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