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Wastewater Nitrogen Loading Analysis-Calculations for Nile Garden Elementary School <br /> Nitrate-N Loading Calculation-Annual Water-Chemical Mass Balance <br /> Wastewater Average Rainfall Background Resultant GW <br /> Scenario Effluent Recharge,R g e g c <br /> Nitrogen,N Nitrogen,N <br /> Flow,W Total Nw Denit,d (15.36 ac area) <br /> gpd ac-ft/yr mg-N/L (fraction) inches ac-ft mg-N/L mg-N/L <br /> 1971-2000 Rainfall Ave <br /> a.Nile Garden Elementary 1,940 2.17 100 0.15 8.50 10.88 1.0 14.98 <br /> b.Nile Garden Elementary 1,940 2.17 100 0.50 8.50 10.88 1.0 9.16 <br /> 1.Average Annual Wastewater flow for 828 student/faculty,at 5 gpd per person for 180 days/yr,95%attendance <br /> 2.Effluent nitrogen concentration 100 mg-N/L for schools <br /> 3.Rainfall recharge from monthly water balance analysis worsheet,attached <br /> 4.Background nitrate-nitrogen estimate 0.5 to 1.0 mg-N/L,from fertilizer,animals,leaf litter <br /> S. Scenario a:Standard Leaching Trenches; Scenario b:Pressure distribution leaching trenches <br /> Resultant Nc=((W)*(Nw)*(1-d)+(R*Na))/(W+R) <br />