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© 2004-2016 DKF Solutions Group All rights reserved. <br />City of Redwood City: Overflow Emergency Response Plan B-3c Sanitary Sewer Overflow/Backup Response Packet <br />Volume Estimation: Upstream Lateral Connections Method <br />SSO Date: Location: <br />STEP 1: Determine the number of Equivalent Dwelling Units (EDUs) for this SSO: EDUs <br />NOTE: A single-family residential home = 1 EDU. For commercial buildings, refer to agency documentation. <br /> <br />STEP 2: This volume estimation method utilizes daily usage data based on flow rate studies of several <br />jurisdictions in California. Column A shows how an average daily of usage of 180 gallons per day <br />is distributed during each 6-hour period. Adjust the table as necessary to accurately represent the <br />actual data. <br /> Complete Column E by entering the number of minutes the SSO was active during each 6-hour <br />time period. Multiply column D times Column E to calculate the gallons spilled during each time <br />period. Add the numbers in Column F together for the Total Estimated SSO Volume per EDU. <br />Time Period <br />Flow Rate Per EDU SSO <br />A B C D E F <br />Gallons <br />per <br />Period <br />Hours <br />per <br />period <br />A÷B = <br />Gallons <br />per Hour <br />C÷60 = <br />Gallons per <br />Minute <br />Minutes SSO <br />was active <br />during period <br />D × E = <br />Gallons spilled <br />per period <br />6am-noon 72 6 12 0.20 <br />noon-6pm 36 6 6 0.10 <br />6pm-midnight 54 6 9 0.15 <br />midnight-6am 18 6 3 0.05 <br />Total Estimated SSO Volume per EDU: <br /> <br />STEP 3: Multiply the Estimated SSO Volume per EDU from Step 2 by the number of EDUs from Step 1. <br /> gallons X = gallons <br /> Volume per EDU # of EDUs Estimated SSO Volume <br /> <br />STEP 4: Adjust SSO volume as necessary considering other factors, such as activity that would cause a <br />fluctuating flow rate (doing laundry, taking showers, etc.). Explain rationale below and indicate <br />adjusted SSO estimate (attach a separate page if necessary): <br /> <br /> Estimated SSO Volume: gallons <br /> <br />Do you believe that this method has estimated the entire SSO? ☐ Yes ☐ No <br />If no, you MUST use additional methods to estimate the entire SSO. If yes, it is advisable to use additional <br />methods to support the estimation. Explain why you believe this method has/has not estimated the entire SSO: <br /> <br /> <br />This worksheet completed by: <br />Name: Signature: <br />Job Title: Date: <br />6.2.A. - Page 142