Advances in Hydroscience, Volume 12-1981 covers articles in the areas of fluid mechanics and hydrology. The book presents articles on advances in cavitation research, applied stochastic theory of storage in evolution, and echohydrodynamics. The text also includes articles on the usefulness and the basic nature of the application of pattern recognition in the context of hydrologic data analysis. A summary of the Hydrologic Engineering Center's experience in water resources system simulation is also encompassed. The book will prove invaluable to hydrologists, practitioners handling the design and control of hydraulic structures and machinery, and engineers working in the water industry.

The subject of rainfall-runoff modeling involves a wide spectrum of topics. Fundamental to each topic is the problem of accurately computing runoff at a point given rainfall data at another point. The fact that there is currently no one universally accepted approach to computing runoff, given rainfall data, indicates that a purely deter ministic solution to the problem has not yet been found. The technology employed in the modern rainfall-runoff models has evolved substantially over the last two decades, with computer models becoming increasingly more complex in their detail of describing the hydrologic and hydraulic processes which occur in the catchment. But despite the advances in including this additional detail, the level of error in runoff estimates (given rainfall) does not seem to be significantly changed with increasing model complexity; in fact it is not uncommon for the model's level of accuracy to deteriorate with increasing complexity. In a latter section of this chapter, a literature review of the state-of-the-art in rainfall-runoff modeling is compiled which includes many of the concerns noted by rainfall-runoff modelers. The review indicates that there is still no deterministic solution to the rainfall-runoff modeling problem, and that the error in runoff estimates produced from rainfall-runoff models is of such magnitude that they should not be simply ignored.