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6/17/2021 <br />4 <br />Yearly Precipitation and Volume <br />Year <br />Total Yearly <br />Precipitation <br />(inches) <br />Total Yearly <br />Stormwater <br />Volume (Mgal) <br />2009 19.77 156.35 <br />2010 29.12 175.53 <br />2011 26.80 222.38 <br />2012 24.44 203.13 <br />2013 25.31 242.39 <br />2014 25.63 168.11 <br />2015 30.63 157.10 <br />2016 36.65*119.96 <br />2017 28.94 139.92 <br />2018 22.10 139.39 <br />2019 32.19 222.03 <br />2020 21.89 104.29 <br />Average 26.07 170.88 <br />0.00 <br />5.00 <br />10.00 <br />15.00 <br />20.00 <br />25.00 <br />30.00 <br />35.00 <br />40.00 <br />0.00 <br />50.00 <br />100.00 <br />150.00 <br />200.00 <br />250.00 <br />300.00 <br />2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Precipitation (inches)Volume (Mgal)Annual Precipitation and Stormwater Volume <br />Total Yearly Precip (inches)Total Yearly Volume (Mgal) <br />*2016 precipitation value is from Waite Park due to <br />missing rain gauge data at 10SA for part of the year. <br />Average precipitation excludes 2016. <br />Load Calculation Overview <br />•Load = Concentration * Volume <br />•Baseflow loading: Monthly median baseflow concentration (mg/L) * <br />mean daily baseflow (cfs) *conversion factor to get lbs <br />•Pollutant yield: Divides load by area (lbs/acre) <br />•Normalized pollutant yield: Divides pollutant yield by runoff depth <br />Calculating Loads <br />4