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To: Lanya Ross, Anneka LaBelle, Ali Elhassan <br />From: Evan Christianson, Ray Wuolo <br />Subject: Metro Pumping Optimization 3 <br />Date: April 2, 2015 <br />Page: 2 <br />the SWUDS database shown in Table 1. A total of 2,074 wells were included in the optimization. The goal <br />of the optimization was to maximize the objective function, which is essentially the sum of the pumping <br />from all decision variable wells. <br />Table 1. SWUDS use codes for decision variable wells included in the optimization <br />Use Code <br />Description <br />Use Code <br />Description <br />211 <br />Municipal <br />248 <br />Non-metallic processing <br />212 <br />Private waterworks <br />249 <br />Industrial processing <br />213 <br />Commercial and Institutional <br />263 <br />Quarry dewatering <br />215 <br />Fire protection <br />264 <br />Sand/gravel pit dewatering <br />229 <br />Power generation <br />266 <br />Dewatering <br />232 <br />Institutions <br />271 <br />Pollution containment <br />241 <br />Agricultural processing <br />277 <br />Sewage treatment <br />242 <br />Pulp and paper processing <br />289 <br />Non -crop irrigation <br />246 <br />Petroleum -chemical processing, ethanol <br />290 <br />Major crop irrigation <br />247 <br />Metal processing <br />2.2 Constraints <br />Constraints impose restrictions on the values that can be taken by the decision variables (Ahlfeld et al., <br />2000). Three types of constraints were used: hydraulic head, flux between groundwater and surface -water <br />features (baseflow and basin leakage and/or gain), and groundwater flow -direction. In general, <br />Optimization 3 and Optimization 2 are constrained significantly less than Optimization 1. A summary of <br />constraints imposed for each optimization is shown in Table 2 and details describing each constraint type <br />are presented below. <br />