REALM (REsource ALlocation Model) is a generalised computer simulation package that models harvesting and bulk distribution of water resources within a water supply system. Like other water resource simulation models, REALM uses mass-balance accounting at nodes, while the movement of water within carriers is subject to capacity constraints. It uses a fast network linear programming algorithm to optimise the water allocation within the network during each simulation time step, in accordance with user-defined operating rules. Outputs from REALM simulations include various descriptors of system status and behaviour during each time step. REALM facilitates the graphical presentation of raw or post-processed outputs. A suite of utility programs is provided with REALM software package for the latter purpose. This paper will describe the main features of REALM and provide potential users with an appreciation of its capabilities. It will also describe two case studies covering major urban and rural water supply systems. These case studies will illustrate REALM's capabilities in the use of stochastically generated data in water supply planning and management, modelling of environmental flows, and assessing security of supply issues.
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