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<br />Regional and <br />National Synthesis <br /> <br />~ <br /> <br />Study-Unit <br />Investigations <br /> <br /> <br />NATIONAL SCALE <br /> <br />. General summaries of key findings <br />. Summaries for specific topics <br /> <br />REGIONAL SCALE <br />(Muitistudy unit) <br /> <br />8912 <br /> <br />. Summaries for large hydrologic regions <br />. Summaries for geographic regions that are <br />defined by the specific issues under study <br /> <br /> <br />STIJDY-UNIT SCALE <br />(Stream-aquifer systems ) <br /> <br />. Statistical summaries <br />. Broad geographic descriptions <br />. Problem area identification <br /> <br />LOCAL SCALE <br />(Local parts of stream-aquifer systems) <br /> <br />. Detailed geographic descriptions of specific <br />water-quality conditions <br />. Development of cause-and-effect relations <br /> <br />Figure 3. - Information provided at different scales by the National Water-Qna!ity Assessment Program. <br /> <br />;"" <br />