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Ecological regions versus hydrologic units: Frameworks for managing water quality

James M. Omernik and Glenn E. Griffith
Journal of Soil and Water Conservation September 1991, 46 (5) 334-340;
James M. Omernik
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Glenn E. Griffith
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IN the mid-1970s, a flurry of research and assessment activity began on nonpoint-source pollution. Much of this activity was driven by legislative requirements, particularly Section 208 of the Clean Water Act, which required states to identify nonpoint sources of pollution and develop feasible methods to control these sources. Unfortunately, response to the law was piecemeal. Individual states used a variety of different methods to research and assess water quality problems, and most lacked a logical and useful spatial (geographical) framework to put the results into a meaningful perspective. State water quality assessments often used drainage basins or hydrologic units, and federal assessments used similar units or even political boundaries. Similarly, best-management-practice recommendations were commonly made for political units, drainage basins, or hydrologic units.

It soon became obvious that extrapolating results of nonpoint-source pollution research was difficult, and efforts to illustrate the extent of the problems for states and the nation were fuzzy, if not grossly distorted. As one review pointed out in 1985, the net effect of 10 years of nonpoint-source pollutant characterization and hundreds of “208” plans was hard to document (35). Chesters and Schierow (2) observed that, in spite of …

Footnotes

  • James M. Omernik is a research geographer at the Environmental Research Laboratory, U.S. Environmental Protection Agency, 200 Southwest 35th Street, Corvallis, Oregon 97333. Glenn E. Griffith is a geographer with ManTech Environmental Technology, Inc., 200 Southwest 35th Street, Corvallis, Oregon 97333.

  • Copyright 1991 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 46 (5)
Journal of Soil and Water Conservation
Vol. 46, Issue 5
September/October 1991
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Ecological regions versus hydrologic units: Frameworks for managing water quality
James M. Omernik, Glenn E. Griffith
Journal of Soil and Water Conservation Sep 1991, 46 (5) 334-340;

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Ecological regions versus hydrologic units: Frameworks for managing water quality
James M. Omernik, Glenn E. Griffith
Journal of Soil and Water Conservation Sep 1991, 46 (5) 334-340;
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