Meteorological models generate fields of precipitation and other climatological variables as spatial averages at the scale of the grid used for numerical solution. The grid-scale can be large, particularly for general circulation models and disaggregation is required. Disaggregation models were introduced in hydrology by the pioneering work of Valencia and Schaake (1972, 1973). Disaggregation models are widely used tools for the stochastic simulation of hydrologic series. They divide known higher-level values (e.g. annual) into lower level ones (e.g. seasonal), which add up to the given...

Efficient and accurate prediction of watershed runoff is important for watershed management studies, safe yield and design of flood control structures. This book highlights runoff prediction using synthetic hydrologic models and geomorphological approach. Various runoff models emerged to estimate the temporal and spatial variation of quantity of runoff from particular rainfall which can be categorized into system theoretic models, conceptual models, and time series models. Requirement of long historical records and lack of physical basis constrained the use of system theoretic models in...