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Hantzche and Finnemore Equation Calculator <br />Effluent Quantity (Q) <br />400.00 <br />gals/day <br />Effluent Stream (Nw) <br />35.00 <br />mg/L-N <br />Site Area (A) <br />2.00 <br />Acres <br />Concentration Rain (Nb) <br />0.14 <br />mg/L-N <br />Denitrification (d) <br />0.25 <br />% <br />Average recharge rate of rainfall, in inches <br />per year (R) <br />8.41 <br />in/year <br />Uniform waste water loading I <br />2.70in/ <br />ear <br />Total Nitrate -N Concentration of waste <br />water percolate (Nr) <br />mg/L-N <br />Nr= <br />I*Nw(1-d)+RNb Q*365*12 <br />I= <br />(I+R) A*7.48*43560 <br />I= Volume rate of water water entering the soil averaged over the gross <br />developed area, in inches per year. <br />Nw= Total nitrogen concentration of water water, in milligrams per liter. <br />d= fraction of nitrate -nitrogen loss due to denitrification in the soil. <br />R=average recharge rate of rainfall, in inches per year. <br />Nb= Background nitrate -nitrogen concentration of rainfall recharge at the <br />water table, exclusive of waste -water influences, in milligrams per liter. <br />No Area of localized recharge? <br />60 ft Seasonal high depth to groundwater <br />Uniform waste water loading (I) 2.69 35 ft 3.5 Depth of vadose zone from bottom of DF to seasonal high groundwater <br />24 ft Total feet of confining layers from bottom of DF to seasonal high groundwater <br />69% % 4.3 Percent confining layers in vadose zone <br />7.8 <br />Input Parameters 1 point for every 10' of vadose zone <br />Calculated Paramter 1 point for every 10% confining layer <br />Result <br />Dispersal Field = DF <br />