WATER-SUPPLY PLANNING SIMULATION-MODEL WING MIXED-INTEGER LINEAR-PROGRAMMING ENGINE

This paper presents a simulation model to be used for water supply pla nning by a metropolitan water utility, Water supply operations for a s ingle, monthly time step are formulated as a mixed integer linear prog ram (or more simply, LP). The LP is then embedded in a month-by-month simulation model, The LP is formulated using a priority-based objectiv e function, The model has been used successfully by the Alameda County Water District (California) staff for its long-range, integrated plan ning. The model also shows that some of the inherent weaknesses of mat h programming in general and mixed integer linear programming in parti cular, can be overcome to build a successful model.