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Image Placeholder ACOMPREHENSIVE SANITARY SEWER PLAN 2040 COMPREHENSIVE PLAN UPDATE DRAFT Dec14-17 for review only I/I Analysis The City of Hugo’s sanitary sewer system is relatively new compared to other cities in the Metro Area� All of the lift stations and a majority of the sewer lines were constructed from the 1970s onward� Approximately 8% of the residential housing in the City was constructed before 1970, and none of the pre-1970 era private services have been evaluated for I/I� However, the City televises its sanitary sewer lines in conjunction with its street and utility improvement projects, at which time potential issues with private services are identified. A comparison of the dry weather flow versus average annual flow for Hugo’s Metershed region from 2012-2016 is given in Table 10-12 below� Dry weather flow is calculated as average flow during the months of December through February. The purpose of this comparison is to give a general indication of the extent of I/I in the region� Based on the difference between average and dry weather flow, averaged over 2012-2016, the estimated amount of clearwater entering the system is approximately 36,000 gallons per day� The percent increase from dry weather to average annual flows in the City of Hugo was less than 10% in every year except for 2016. A slight increasing trend is indicated by the metering data from the last five years; the City will continue to monitor this data to see whether or not this trend continues� The City’s strategies, standards, and investments for reducing I/I are listed in the next section� Table 11-12 Dry Weather Flow vs. Average Annual Flow for Hugo Metershed Year Dry Weather Flow (MGD) Average Annual Flow (MGD) Percent Increase 2012 0�61 0�62 1�75% 2013 0�64 0�66 3�78% 2014 0�56 0�60 6�89% 2015 0�55 0�60 8�75% 2016 0�54 0�60 10�40%