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<br />City of Gem Lake Comprehensive Plan GEMLK 140643 <br />Page 61 <br />Existing Land Use 2030 <br />Comprehensive <br />Plan <br />GPD/AC <br />2040 Comprehensive Plan <br />GPD/AC <br />Single Family Estate 22.9 22.9 <br />Single Family Executive 110 110 <br />Single Family Residential 825 110 <br />Single Family Residential (1-acre) 825 110 <br /> <br />Using the Land Use method to calculate sanitary loading rates and the rates summarized <br />above, the sanitary loading of existing sewered Gem Lake into the MCES interceptors is <br />approximately 0.034 MGD, on par with MCES flow projections for Gem Lake. <br />A diurnal flow pattern was applied to the model to represent typical flow patterns. The <br />diurnal curve used in the model is shown in Table 7-4 below. A diurnal flow pattern <br />mimics typical water uses, with peaks in the morning and evening, when much of the <br />general population is at home. <br />Table 7-4 – Diurnal Flow Pattern <br />Hour Factor Hour Factor <br />0 0.65 12 1 <br />1 0.65 13 0.9 <br />2 0.65 14 0.85 <br />3 0.75 15 1.05 <br />4 0.9 16 1.2 <br />5 1.2 17 1.1 <br />6 1.45 18 1.05 <br />7 1.8 19 1 <br />8 1.5 20 0.9 <br />9 1.1 21 0.85 <br />10 1 22 0.75 <br />11 1.1 23 0.6 <br /> <br />This analysis shows that the Southeast District is already at capacity. Figure 7-2 show <br />pipes at varying Depth over Diameter (d/D) capacities. Depth over Diameter is a ratio of <br />how full the pipe is compared to diameter of pipe. Ratios between 0.6-0.8 mean the pipe <br />is approaching full capacity and a ratio of greater than 0.8 means the pipe is at full <br />capacity. The figure also shows total flow per existing sub-sewered district. <br />Each model run results in pipes at different capacity ratios at different times of day. The <br />attached figures (7.1-7.5) show the worst time of day for the most downstream pipe. <br />Pipes may be yellow or red due to capacity issues due to amount of flow, flat slopes <br />(meaning water builds up easier in the pipe as opposed to steep slopes) or caused by <br />data issues.