Laserfiche WebLink
2. CSO Underflow Upgrades <br />Background: <br />As part of the wider control system design, several underflows across the city were selected for <br />dynamic control to optimize flows into the interceptor during and before certain storm events. <br />Controlled and coordinated valves can prioritize flows to reduce overflows while maximizing <br />capacity at the interceptor line. The logic driving the positioning and modulation of existing parallel <br />throttle line valves has performed as designed. Not all underflows had this work performed. As <br />such, anecdotal observations of the system indicate that there is room for improving the system's <br />capability to capture additional flow volume. EmNet will now explore how to expand these designs <br />to other locations along the interceptor. <br />Objective: <br />Identify and optimize underflows within the collections system to increase captured flow and <br />reduce CSO overflow volumes. <br />Tasks: <br />A. Perform a comprehensive analysis of the hydraulic performance of the throttle line valves <br />on at least 3 storm events during the last wet weather season. <br />B. Review and propose new enhanced control logic for each of the throttle line valves. <br />C. Identify sites with largest capture opportunities to implement new throttle lines and valve <br />control points. <br />Deliverables: <br />Technical memorandum detailing: a prioritized list of underflow optimization points within <br />the collections system, proposed enhancements on the control logic, its hydraulic <br />performance, and its rationale. <br />Conduct a workshop to show the control enhancements and discuss the expected <br />results. <br />e net 121 S. Niles Ave., Suite 22, South Bend, IN 46617, +1.574.855.1012, www.emnet.net <br />jai x,yfi^onx Cu,:tnta <br />