Our basic model is that to make some predictions for Billings next thirty years development. The major assumption is that the whole industry of the city can be divided into three parts: the agricultural area, the industrial area and the domestic area. We firstly make some predictions based on the collected data for different walks. And the future 30 years water usage trend has been given out by using the least square method and multiple linear regression model. Then we build three basic models for the three major departments. The irrigation model establishes the ditch network for west crops region accompanied by the sprinkling irrigation model used for the livestock husbandry. Next step, the industrial water consumption model is applied to the current factories.
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