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GENERAL NOTES: <br />1. SEE HONEYWELL DRAWINGS E-903 SERIES FOR DETAILS ON SEQUENCE OF OPERATIONS. <br />2. SEE CONTROL STRATEGY SPECIFICATION FOR ADDITIONAL DETAILS ON CONTROL SYSTEM AND <br />HMI OPERATION. <br />MAXIMUM WSE IN I <br />375 <br />370 <br />365 <br />USV ALLOWS UP TO 57CFS OUT OF I <br />355 <br />USV STARTS TO OPE <br />START BYPASS OVER WE <br />350 EX—DBRISER—GATE CLOS <br />BYPASS WEIR CRE <br />TO STILLING BA, <br />345 <br />ORIFICE INVE <br />TO El <br />ME <br />USV SLUICE GATE INVE <br />335 TO OVERFLOW STRUCTU <br />OVERFLOW STRUCTURE <br />CONTROL ELEVATION DIAGRAM <br />I <br />SYM REVISION I BY I APPROVED <br />BOEING EVERETT SITE STORMWATER UPGRADE 250654861 KJ I LGR <br />CONTROLS NOTES: <br />FLOW CONTROLS: <br />2 PROPOSED PUMPS: PUMPS OPERATE IN PARALLEL, CONVEYING FLOW FROM THE OVERFLOW <br />STRUCTURE TO THE SOUTH EMF BASIN <br />0 1 PROPOSED VALVE: USV CONTROLS FLOW FROM DB TO OVERFLOW STRUCTURE <br />• 1 EXISTING VALVE AT DB OUTLET STRUCTURE: EX-DBRISER-GATE <br />• 4 SENSORS: DB LEVEL SENSOR, OVERFLOW STRUCTURE LEVEL SENSOR, EMF FLOW SENSOR <br />AT SDMH 2-1, OUTLET FLOW SENSOR AT SDMH 1-1 <br />DB LEVEL RANGES <br />1. DB WSEL 345.2 - 349.2 <br />A. USV GATE IS ALWAYS FULLY OPEN IN THIS LEVEL RANGE. <br />B. EX-DBRISER-GATE POSITION IS CALCULATED VIA A TABLE FROM DETENTION BASIN LEVEL. <br />C. PUMPS ARE BOTH CALLED TO OPERATE IN THIS LEVEL RANGE. <br />2. DB WSEL 349.2 ® 352.4 <br />A. USV POSITION IS CALCULATED TO DE THE LESSER OF THE FOLLOWING TWO SIGNALS: <br />i. THE VALUE INTERPOLATED FROM A LOOKUP TABLE (FURNISHED IN THE SPECIFICATIONS), <br />USING THE DB LEVEL AS THE TABLE INDEX. <br />ii. A VALUE THAT MAY BE SET AT THE LOCAL HMI, BUT ONLY IF THE OVERFLOW STRUCTURE <br />LEVEL IS ABOVE 348.3 FT. IF THE LEVEL IS BELOW 348.3 FT, THE LOOKUP TABLE VALUE <br />HAS COMPLETE CONTROL OF THE GATE. <br />3. DB WSEL 352.4 - 376.0 <br />A. USV POSITION IS CALCULATED TO BE THE LESSER OF THE FOLLOWING TWO SIGNALS: <br />i. THE VALUE INTERPOLATED FROM A LOOKUP TABLE (FURNISHED IN THE SPECIFICATIONS), <br />USING THE DB LEVEL AS THE TABLE INDEX. <br />ii. A VALUE THAT MAY BE SET AT THE LOCAL HMI, BUT ONLY IF THE OUTLET FLOW TO THE <br />STILLING BASIN IS MORE THAN 49 CFS. IF THE FLOW IS BELOW 49 CFS, THE LOOKUP <br />TABLE VALUE HAS COMPLETE CONTROL OF THE GATE. <br />TABLE 1: SUMMARY <br />DB WSEL <br />GOVERNING <br />FLOWRATES <br />GOVERNING SENSOR <br />VALVE STATUS (OPEN/CLOSED) <br />PUMPS <br />341.2-345.2 <br />OCFS <br />N/A <br />EX—DBRISER®GV®1 <br />FULLY OPEN, USV FULLY OPEN. <br />PUMPS <br />OFF <br />345.2-349.2 <br />5.5CFS MAX <br />OUT OF DB <br />DB SENSOR <br />EX—DBRISER—GV-1 <br />PARTIALLY OPEN, USV FULLY <br />OPEN. <br />PUMPS <br />ON <br />349.2-352.4 <br />24CFS MAX <br />OUT OF DB <br />EMF SENSOR <br />EX®DBRISER—GV-1 <br />CLOSED, USV PARTIALLY OPEN. <br />PUMPS <br />OFF <br />352.4-376 <br />49CFS MAX TO <br />STILLING BASIN <br />STILLING BASIN SENSOR <br />EX—DBRISER—CV-1 <br />CLOSED, USV PARTIALLY OPEN. <br />PUMPS <br />OFF <br />MARCH 5,2021 <br />DATE <br />sym <br />REVISION <br />BY <br />APPROVED <br />DATE <br />G a <br />ACCEPTABILITY <br />THIS DESIGN AND/OR <br />SPECIFICATION IS APPROVED <br />DRAWN <br />LMW KLK <br />DATE <br />03.05.21 <br />SUBTITLE <br />03.05.21 <br />CHECKED <br />ECK <br />03.05.21ENGINEER <br />APPROVED B <br />DEPT. <br />I DATE <br />BEF <br />03.05.21 <br />TITLE <br />CHECKED <br />z2589 <br />ECK <br />03.05.21 <br />APPROVED <br />® <br />rAI. <br />APPROVED <br />PROCESS <br />03.05.21 <br />in 1 <br />Sri <br />