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Figure 1 -- Water Resources Regions and hydrologic accounting units of the United States <br />(U.S. Geological Survey, 1982). <br />methods for presenting and displaying information from the program. Thus, the program <br />will be well positioned to begin studies in other areas after the first 2 years, leading to the <br />initial stages of a comprehensive and continuously updated national assessment within 5- <br />7 years and initial national products within 2 -3 years of implementation. <br />The pilot studies were described in a previous document. Brief summaries are as follows: <br />Great Lakes Basin Study -- Even though the water resource is vast in the Great Lakes <br />Basin, uncertainties in the estimates of the water inflows, outflows, and water use <br />threatens the ability of the States to provide defensible decision making under Annex <br />2001 to the Great Lakes Charter. Information that will support decisions for Annex 2001 <br />is a key element of the study for the Great Lakes Basin. This includes (1) information <br />about consumptive water use, (2) up -to -date reports of water availability in the basin <br />(both surface and ground water), (3) analyses of the effects of ground -water withdrawals <br />on surface water, (4) an evaluation of the gaging stations on the Great Lakes connecting <br />channels, and (5) analysis of the streamflow gaging network on tributaries to the Great <br />Lakes. A regional ground -water flow model for the Great Lakes Basin will serve as a <br />regionwide framework for local studies and decision - making. <br />5 <br />