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<br /> <br />Servicing a rain gage <br /> <br /> <br />Sampling bed material <br /> <br /> <br />Measuring streamflow by wading <br /> <br />Figure 1.1-1.--U.S. Geological Survey personnel collecting <br />water-resource data. <br /> <br />5 <br /> <br />1.0 INTRODUCTION <br />1.1 Objective <br />