... simulation software EPANET to solve the optimal operation model of mixed-pump stations with the operating-mode adaptability The outlet flow QPi , j of each pump station is taken as the decision variable ... optimization is 3.84%, so the water supply requirement can be satisfied Fig.4 - The Outlet Flow for Each Pump Station of the First and Second Optimization CONCLUSION The purpose of optimal operation ... operation scheme and the speed ratio of speed governing pump are determined to satisfy the dispatching commands, at the same time, to minimize the total consumption of all pump stations Therefore, the...