Advances in Water Treatment and Enviromental Management

112 WATER TREATMENThrs to prevent reservoirs dropping below the minimum level of 55%. As demand reduces inthe second half of the day two pumps are sufficient to maintain reservoir levels.The valve openings, Fig. 11, show that FCVs 1 and 4 are further open than in the previousexample to enable PS1 to make up for the flow loss from PS 3.4.2 STUDY 2The trunk main system shown in Fig. 12 is currently used to pump water from PS 1 to thetreatment works at R1 and R5; the total system demand is 55 Ml/day. The objectives of theFIG. 10 PS1 PUMP SCHEDULE [STUDY 1]FIG. 11 FCV OPENING [STUDY 1]