ABSTRACT
River system modelling and analysis related to reservoir operation need hydrologic and related data. Long records representative for historical hydrology are used in planning studies. Existing observations are required for real-time operations. Moreover, a selection of computational tasks is involved in converting records of field measurements on hydrologic processes to the input data required for river basin development and reservoir system analysis models. River and reservoir system analysis models are built around water accounting and routing algorithms. Water accounts are balanced as water is routed through the system. In a reservoir operation model, the streamflow provides the inflow to the system. Reservoirs regulate the streamflow through storage and releases. Rainfall data concern one of the parameters in a hydrologic analysis for reservoir operation. The dependable and effective rainfall are used for reservoir simulation and consumptive use of irrigated crops. Evapotranspiration from crops and the soil surface is an important parameter in the water balance equation.
