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January 26,2024 <br /> Don Peterson <br /> Page 11 of 21 <br /> Reference: Water Quality Assessment of Silver View Pond,Mounds View,MN <br /> AFpred = —36.2 + 50.2 Iog(TPsumrner) <br /> + 0.762 z/Aa5 <br /> Where: <br /> • TP= summer average <br /> • a/Ao°5 is a morphometric factor(z= mean depth in meters; Ao is surface area in km2) <br /> Once the estimated number of days of anoxic and oxic conditions are estimated, these factors are <br /> multiplied by the direct measurements of sediment release rates to obtain an approximate lake-wide TP <br /> load. <br /> For this mass balance exercise, we assumed that inputs from the atmosphere are negligible, as the goal <br /> was to determine the relative proportion of internal and external loads, which are presented in Table 6 and <br /> Figure 5. The results of the mass balance exercise indicate that the majority of the phosphorus load is <br /> derived from the surrounding watershed (66%of the total load), followed by internal loading (34%). The <br /> areal load from oxic release (26%)was greater than the areal load from anoxic release (8%). <br /> Table 6. Phosphorus Modeling Results <br /> Source Contribution Load(lbs/yr) %of Total <br /> Load <br /> External TP Load 176.8 66% <br /> Internal TP Load-Anoxic 21 34% <br /> Internal TP Load-Oxic 70 <br /> Total 267.8 100% <br /> Design with community in mind <br />