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Wastewater Treatment System `NW '' �- FALL CREEK Engineering Report ENGINEERING,INC. of the variables in the water balance how they relate to each element. Further descriptions of the variables follow. i. RGt EGt yr GRASS FIELD _ IGt RWt Rpt EN EWt OWt Oct P't STORMWAlER OPt DETENl10N AREA St WETLAND r. Ipt IWt = 0 y- Figure 3.1. Mathematical Schematic of Water Balance Calculation Variables The monthly water balance is the difference between inflows to the treatment system or disposal `. area and losses from the element's surface as given by the following equations: Wetland :SW,_, +P, +S, +RW, —EW, —IW, —SWma,, = OTV,, .. GrassField : OW, +RG, —EG, —IG, = OG , •• StormwaterDetention : SP,_, +OG, +RP, —EP, —IP, —SP.. = OP, . The following is a list of variables (all variables were calculated in gallons): SWt Volume of Water in Wetland Storage RW, Direct Rainfall on Wetland �- SP, Volume of Water in Stormwater Detention RG, Direct Rainfall on Grass Field _ Storage RP, Direct Rainfall on Stormwater Detention P, Process Wastewater EW, Evapotranspiration from Wetland S, Stormwater EG, Evapotranspiration from Grass EP, Evaporation from Stormwater Detention OW, Outflow from Wetland IW, Infiltration from Wetland OG, Excess water not needed by Grass Field IG, Infiltration from Grass Field OP, Overflow from Stormwater Detention IP, Infiltration from Stormwater Detention �- Parameters used in the water balance calculations included wetland and stormwater detention area surface area and depth, wetland porosity, evapotranspiration rates, grass field area, Winery area, wastewater flow rate, and soil infiltration rate. The following discussion describes the variables used in the above equations and the parameter assumptions. JESSIE'S GROVE WINERY MAY 2002 10