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o Interpreting these data and publishing the results of these inter- pretations. This involves the inference of hydrologic causes, effects, and probabilities; and the extension, over space and time, of information contained directly in the data. Developing and applying new methods of hydrologic data collection, analysis, and interpretation. Conducting areally focused interpretive investigations and apprais- als at national, regional, State, or local scales. These include characterizations of ground and surface waters, and of precipitation chemistry, evaluation of natural hydrologic hazards, and studies of other water-related topics, Frequently these investigations involve the development, testing, and application of mathematical models capable of predicting the hydrologic consequences of management actions, development plans, or natural phenomena. These investiga- tions are carried out through specific Federal programs or in coop- eration with State and local governments or other Federal agencies. Results are published in technical journals or in State, local, USGS, or other Federal agency publications. Reporting to the Nation, on a regular basis, on the overall status of the water resource, and on hydrologic events and water-resource issues. o o o Research. The Division conducts research in a wide variety of scientific disciplines--geochemistry, ecology, geomorphology and sediment transport, water chemi stry, ground-water hydrology, and surface-water hydrology-- particularly as these disciplines relate to the quantity, flow, and qua 1 ity of surface water and ground water and to other aspects of the hydrologic cycle. The research is intended to: o Improve the overall understandi ng of the pathways, rates of move- ment, chemical processes, and biological processes in the hydrologic cycl e. Improve the overall understanding of the hydraulic, chemical, and biological factors, both natural and anthropogenic, which affect the resource. o o Provide new strategies of data collection, analysis, and interpreta- tion, in the light of new knowledge and evolving scientific capabilities. Improve methods of predicting the response of hydrologic systems to stresses, whether hydraulic or chemical, and whether of natural or human origin. o Coordinating the Activities and Cataloging the Products of Other Entities Involved in Water Research, Data Acquisition, or Information Transfer. This function has four major components: o The coordination of water-data acquisition activities of Federal agencies (as mandated by OMS Circular A-67). The acqui sit i on of water- use data and development of State and national water-use data bases in cooperation with State governments. o 3