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Along with the rapid development of manufacturing industries, all kinds of factories have been established in Taiwan. Since the demand of industrial water has increased dramatically, the shortage problem of water supply has become one of the critical issues of EIA for the planning and development of new industrial parks. Since water shortage could causes tremendous loss of the operation of factories, it is an important task to estimate the water demand at the planning stage of industrial park development so that appropriate strategy can be developed in advance.Based on multiple regression model, estimation models for water demand are developed in this research. Recognizing the fact that the factory area are not well linearly correlated with the water use, instead of a look-up table of water demand by unit of land area, variables such as number of employment, land area and floor area of factories are included and tested. Essentially, the water consumption of industrial factories is a very dynamic and complicated process, it is influenced by factors such as production method, type of products and equipment, and devices of water conservation etc., however, they are not correlated with the water demand in a exactly linear format. It is the purpose of this research to develop a water demand estimation model of manufacturing industries for the planning analysis. The proposed multiple regression model not only allows the planner to analyze the various influencing factors in the model, but also provides the capability of interval estimation so that policy variables can be better explained and considered in the planning process.
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