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lzpff Project: Port of Everett- M I E Date: 18-Nov-20 <br /> WQ Lift Station Design Sheet# 1 <br /> 1601 5th Avenue,Suite 1300 <br /> Seattle, Washington 98101 Client: POE Job# <br /> p(206)382-0600 f(206)382-0500 By: ECN <br /> Basin M <br /> Per DOE 2008 Design Manual C2-1.2.5 <br /> "Design of Wastewater and Storm water Pumping Stations"Water Pollution Control Federation, Manual Of <br /> Practices No. FD-4, 1981, p. 18 <br /> *Wet well shall be sized so that the cycle time for each pump will not be less than 5 minutes <br /> or that average cycle time will not be more than 30 minutes. <br /> *The shortest operating cycle occures when the inflow equals one-half the pump discharge rate. <br /> V=tQ/4 <br /> V= minimum effective pump cycle volume between start and stop (gallons) <br /> t= minimum time between pump starts (minutes) <br /> Q = average pump capacity(gallons/minute) <br /> t= (time to fill)+(time to run) <br /> t= 6.00 MIN 5.0 Starts per hour per pump <br /> Q= 1,597 GPM <br /> V= 2,396 GALLONS <br /> V= 320 CIF <br /> Wet Well Size <br /> ID = 10.0 FT *Internal Length of Custom LS/FS Wet Well <br /> ID = 4.75 FT *Internal Width of Custom LS/FS Wet Well <br /> Base Area= 47.5 SF <br /> Unit Volume = 47.5 CF/FT <br /> Unit Volume = 355 Gallons/FT <br /> Depth Needed= 6.74 FT <br /> Shortest Operating Cycle <br /> *This calculation is the logic behind the DOE requirment above. <br /> *Shortest operating cycle occures when Qin=0.5*Qout <br /> *Smith & Loveless Engineering Data (1951) <br /> t=(V/(D-Q)) + (V/Q) <br /> D = Rated pump delivery in GPM <br /> V= Storage volume between high and low levels in gallons (see V above) <br /> Q = Inflow to wet well in GPM <br /> t=Total time between successive pump starts (operating cycle) <br /> D= 1,597 GPM OUT <br /> V= 2396 Gallons <br /> Q= 798.50 GPM IN <br /> t= 6.0 minutes <br />