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11CES Consultants ● City of Sunny Isles Beach RFQ No. 18-11-01 <br />The Lincoln Road Pump Station that CES is currently designing for <br />Miami Beach has specified two primary (30,000 GPM) low head <br />axial pumps and one (1) spare/ redundant pump of similar make <br />and capacity. This redundant pump will be used by the Miami Beach <br />for additional capacity in the event of additional growth or more <br />stringent criteria is implemented as a result of climatic impacts <br />potential connection to the Flamingo Neighborhood tributary area in <br />the future. The Pump Station will be a duplex pump station with each <br />pump having a peak capacity of 30,000 gpm with a total capacity of <br />the proposed improvements of 90,000 gpm (178.24 cfs). The pumps <br />conceptually specified for this project must be able to handle to <br />handle large volumes of water with relatively low head differentials. <br />The peak flow rate of the Golde Shores system will need to be <br />approximately equivalent to combined peak bypass flow rates <br />defined in the analysis for the pollution control structures. This results <br />in a system where the pump stations can discharge the total flow <br />being conveyed by the system to the pump stations through the <br />pollution control structures. <br />BMPs for the Proposed System <br />For this project, hydrodynamic <br />separator may be used, which <br />uses swirl concentration and <br />continuous deflective separation <br />to screen, separate, and trap <br />trash, debris, sediment, and <br />hydrocarbons from storm water <br />runoff passing through the units. <br />Each unit will need to have a <br />peak treatment flow rate that <br />exceeds the analysis findings <br />A bypass weir could also be <br />considered and sized to bypass <br />the total specified total bypass <br />flow. <br />Pump Station <br />Configuration <br />The Pump Station wet well sizing <br />and pump seating locations will <br />need to be coordinated with the <br />specified pump manufacturer <br />to optimize the Pump Station in <br />terms of size and performance. <br />One potential option would <br />be Axial Flow pumps that are <br />affixed with formed suction <br />intakes (FSI), which are inlet <br />devices that provide optimal <br />inflow to the propeller pump <br />by gradually accelerating and <br />redirecting the flow towards <br />the pump inlet. Its primary <br />function would be to condition <br />the incoming flow into a uniform <br />profile, which virtually eliminates the disruption of flow around the <br />pump intake bell and the creation of vortices within the wet well. By <br />implementing FSI devices, we can achieve a more economical pump <br />station configuration with a smaller footprint and better hydraulic <br />performance than with standard inlet devices. The pump station cycle <br />times will be analyzed for final design utilizing ICPR software and <br />the specified design storm event (5-yr, 24-hour event), an adequate <br />tail water condition, the selected pump performance curve, and the <br />upstream and downstream stormwater system connectivity. We will <br />verify hydraulic losses within the system and incorporate data into <br />the pump selection to meet the specified pump flow rates per pump. <br />Lastly, for the purposes of corrosion protection the pumps will be <br />fitted with zinc anodes attached to the pumps and drive units as well <br />as stainless steel shafts and propellers. <br />Additional System Refinement <br />The proposed system will be refined based on further optimization <br />of system connectivity, minimizing the hydraulic losses within the <br />proposed system, and lessening the overall extent of construction <br />impacts to the public.