The study concludes that current water demand exceeds current safe yield in New Castle County, Delaware, that the deficit may increase by 2 to 3 million gallons per day in the near future, and that, from the economic and engineering viewpoints, the proposed White Clay Creek Dam and Reservoir has the greatest prospect of any proposed project for increasing water supply. Previous engineering, economic, and feasibility studies of the water resources and demand projections in the county are reviewed. Aspects discussed include: projected water demand and county needs, an economic analysis of the White Clay Creek Dam and Reservoir proposal, other currently feasible alternatives, ground water development, a study of the ecological and aesthetic aspects of the reservoir site, and a projection of economic conditions and financing alternatives. (WRSIC abstract)