Multilayer Control of Sewer Networks

A multilayer control system for sewer networks combining optimal flow diversion for overflow minimization with moderate implementation cost is presented. The multilayer structuic consist s of an opt imizat ion layer, a direct control layer and an adaption layer. Control problems connected with these control layers are described. The discrete maximum principle and conjugate gradient techniques are applied for the solution of a simplified optimization problem for the overall network. Optimization results are used as reference trajectories for classical closed-loop control of individual subnetworks. Predicted inflow trajectories needed for the optimization procedure are provided by the adaptation layer.