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<br />space using the GUI. Objects in RiverWare represent the features of a river basin. The objects <br />supported by RiverWare are storage reservoirs, power reservoirs, pumped storage reservoirs, <br />river reaches, aggregate river reaches, confluences, aggregate diversions for municipal and <br />industrial (M&i) and agricultural demands, canals, groundwater, and data objects. Each object <br />has many slots. Slots are essentially place holders for information associated with that object. <br />For example, a storage reservoir has slots such as inflow, outflow, storage, evaporation, <br />elevation, and volume tables. The slots that are visible depend on the methods that the user <br />selects. Almost all of the objects have several different methods available, thus allowing the user <br />to easily customize the physical behavior of an object. For example, to change how a reservoir <br />computes its evaporation, the user simply selects an appropriate evaporation method from the list <br />of methods on the reservoir object. RiverWare adds the appropriate slots to the object and the <br />user provides the necessary data. The selected method and data control how the reservoir will <br />compute its evaporation. After the objects are put into the work space and the appropriate <br />methods are selected, they can be iinked together so information from one object is propagated . <br />to another. For example, the outflow of a reservoir could be linked to the inflow of a downstream <br />river reach. By selecting appropriate objects, methods, and linking the objects together, a river <br />basin network is formed. <br /> <br />After the river basin network is complete, the user can take advantage of many features and <br />utilities that make it easy to input, output, view, manipulate, and analyze data in a model. These <br />utilities include the Simulation Control Table, Data Management interfaces, plotting, snapshot, <br />expression slots on data objects, and the ability to write binary Microsoft Excel spreadsheet files. <br />Simulation Control Tables allow the user to customize views of information in the model and <br />also to run the model and view the updated model run results. Data Management Interfaces <br />provide a way to transport data between a model and external data sources, such as a database or <br />an ASCII file. With the plotting utilities, virtually any information in the model can be easily <br />plotted for analysis and report generation. The snapshot utility provides the user a way to save <br />information from a model run so it can be used to compare with subsequent model runs. <br />Expression slots on data objects provide a powerful way to algebraically manipulate data within <br />the model. Additionally, RiverWare has a robust diagnostics utility for checking for and helping . <br />to pinpoint problems. <br /> <br />Current RiverWare applications where the models are operational include the following <br />applications: (I) long-term policy planning model on the Colorado River (rules model with <br />monthly time-step), (2) midterm planning and operations model on Colorado River (24-month <br />simulation model with monthly time-step), (3) daily operational model for Hoover Dam (BOPS, <br />simulation model), (4) operational model for the TV A (TV A, optimization model with 6-hour <br />time-step), (5) Upalco Planning Model (rules model with daily time-step) and (6) San Juan River <br />Model for the San Juan basin (rules model with monthly and pseudo daily time-step). <br />RiverWare models currently under development include the following: (i) Upper Rio Grande <br />River Basin Model (accounting and rules model with daily time-step), (2) Gunnison River Basin <br />Model (rules model with daily time-step), and (3) Yakima River Basin Models (rules model with <br />both monthly and daily time-steps). <br /> <br />RiverWare Model ofthe San Juan River <br /> <br />. '. <br />, <br /> <br />A-2 <br />