Results are summarized of a six-year study dealing with the engineering aspects of the hydrology of water yield prediction and related problems. The study emphasized (a) the identification of critical problem areas for hydrologic research in Oregon, (b) the planning, development, and coordination of interdisciplinary research and education in hydrology, (c) investigation of the influence of landform and precipitation parameters on the water yield from watersheds, (d) prediction of water yield from watersheds in the Oregon Coast Range, (e) sediment transport in coarse-bedded streams, (f) artificial development of gravel streambeds to provide spawning areas for anadromous fish, and (g) control of siltation in artificially developed spawning channels. (Modified author abstract)