Abstract: In a waterworks system wherein a plurality of zones are coupled by pipes, each of the zones including one purification plant and at least one service reservoir for supplying consumers with clear water fed from the purification plant;before initiation of the operation of the system on a particular day, planned values of pipe flows to be interchanged among the zones, planned values of treated water volumes of the purification plants in the respective zones and planned values of water storage volumes of said respective zones at respective times of said particular day are determined in advance,the treated water volumes of said purification plants and the pipe flows are respectively controlled on the basis of said planned values of said pipe flows and said planned values of said treated water volumes at said respective times and also values of the water storage volumes of said respective zones are observed at said respective times of said particular day,deviations between the observed values of said water storage

Abstract: System for controlling flow rate in pipelines connecting a plurality of reservoirs is disclosed. Flow rate Q.sub.ij (t) of fluid flowing from one reservoir (i) to another reservoir (j) is first calculated from the water levels H.sub.i (t), H.sub.j (t) of both reservoirs (i), (j) and then water level H.sub.j (t+1) of the reservoir (j) at the time (t+1) is calculated from its inflow and outflow taking into account the predicted amount of demand Q.sub.je (t).If the water level h.sub.j (t+1) is below or over the predetermined lower or upper limitation, manipulated variables for valves and pumps installed in pipelines are regulated to control inflow of the reservoir (j) so that the required fluid-feed is satisfied while maintaining the scheduled water level of the reservoir (j).