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NAWQA DESIGN EVALUATION 34 those of the surface water CSUs; in some cases, ground water CSU boundaries coincided with those of surface water CSUs. Each set of CSUs was screened using a modified linear programming model (Fox and Scudder, 1986). The objective function of the linear program minimized the number of study units selected, given certain constraints: (1) the study units account for about 60 percent of the nation's water use, as measured by population served by public water supplies and by total withdrawals excluding thermal and hydropower uses; and (2) each state contains at least one study unit having at least 30 percent of its area within that state.

As the pilot programs proceeded, it became apparent to the committee and to the USGS that the integrated approach was more beneficial. Some of the pilot programs provide good examples of the importance of incorporating surface water and ground water interactions into water quality studies. About this PDF file: This new digital representation of the original work has been recomposed from XML files created from the original paper book, not from the original typesetting files. Page breaks are true to the original; line lengths, word breaks, heading styles, and other typesetting-specific formatting, however, cannot be retained, and some typographic errors may have been accidentally inserted.

NEED FOR A NATIONAL ASSESSMENT OF WATER QUALITY The committee is convinced that there is a genuine need for a long-term, large spatial scale national assessment of water quality in the United States. Human health and environmental health are inextricably linked to our nation's water quality. As our population continues to grow, our water resources are becoming more intensively developed, and more potential contaminants are being produced. Water quality has become an increasingly important component of our political, economic, social, and environmental decisionmaking.

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A review of the USGS National Water Quality Assessment Pilot Program by Unknow


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