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Executive Summary <br />City of Redwood City (0011239.02)12 Woodard & Curran, Inc. <br />Sanitary Sewer Capacity Master Plan November 2023 <br />Project Rankings and Flow Confirmation Levels <br />For gravity sewer capacity improvements, project rankings, as shown in Table ES-3 were based on two factors: design <br />storm deficiency level and flow confirmation level. The design storm deficiency level reflects the extent of model- <br />predicted surcharge (or potential overflow) under design storm PWWF. Four deficiency levels were defined, as follows: <br />1.Model-predicted overflow <br />2.Model-predicted surcharging within 3 feet of ground <br />3.Model-predicted surcharging within 5 feet of ground <br />4.Model-predicted surcharging within 5 feet of ground only under future conditions <br />Flow confirmation level reflects the relative confidence in the model predictions based on the observed conditions at <br />flow meters relative to the location of the predicted capacity deficiencies. Three flow confirmation levels were defined, <br />as follows: <br />1.Flow meter on project reach surcharged during largest monitored storm event <br />2.Flow meter on project reach confirms model flow but did not surcharge during largest monitored storm event <br />3.Flow meter near project reach (upstream or downstream) confirms model flow <br />The deficiency and confirmation levels were used to assign each proposed capacity improvement project to a ranking <br />group (A, B, and C), as follows: <br />Figure ES-5 and Figure ES-6 show the projects in the Main City and Redwood Shores 1 areas, respectively, color- <br />coded by ranking. Note that there are no proposed capacity projects in the Seaport/Pacific Shores area. <br />1 2 3 4 <br />1 A A B C <br />2 A B C C <br />3 B C C C <br />Desi g n Storm Defi ciency L evel <br />Flow Confirmation LevelATTY/RESO.0077/CC RESO SEWER SYSTEM MANAGEMENT PLAN - EXHIBIT A <br />REV: 07-14-25 LF <br /> <br />Page 101 of 317