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-4 .w 3 r ork7ciesfactor Estimating Landscape Water Needs tep 1the Landscape Coefficient(KL) 'formx ka x k ........................ =sp=de km= microclimate factor ks= 0.8 (range= 0.1-0.9) (Turfgrasses=80% of Etc) kd= 1.0 (range =0.5-1.3) (Complete canopy and single vegetation type) kmc=1.4 (range =0.5-1.4) (Open area, with buildings, extraordinary winds) KL=0.8 x 1.0 x 1.4 = 1.12. (ks) (kd) (km) Step 2. Calculate Landscape Evapotranspiration (ETA) ETAformula: ETL= Kix Eto........................... KL= landscape coefficient ETo=reference evapotranspiration KL= 1.12 (calculated in Step 1) ETo=41.85 inches (For months April through September) ETA= 1.12 x 41.85 =46.87 inches. (KL)(ETo) Step 3. Calculate the Total Water to Apply(TWA) TWA formula: TWA= ETA................................. ETA= landscape evapotranspiration IE ............................... .. 9 y IE -- irrigation efficiency I ETA=46.87 (calculated in Step 2) IE =0.75 (Irrigation Efficiency estimate of 75%) TWA= ETA=46_87 inches =62.5 inches IE 0.75 The total water needed(in inches) to be applied to a deep-rooted grass planted over the drip irrigated disposal area during the months of April through September is calculated to be 62.5 inches. Only these months were used in the calculations since it is proposed that the conventional leachlines will manage effluent during October through March when climatic stress induced by rainfall infiltration may occur. The total water needed to be applied(in gallons) over the drip irrigated area during the months of April through September=62.5 in. x 19,500 ft' 0.62 gals/ft'- inch=755,600 gallons. If evapotranspiration is calculated for eight months out of any given year(instead of six),which is plausible given the climatic data presented, we find the total water needed over the drip irrigated disposal area during the months of March through October=TWA= 55.55 in. Eto- 0.75 IE = 74.1 inches x 19,500 ft' 0.62 gals/ft'-inch= 895,900 gallons. This volume is approximately equal to the anticipated total annual wastewater,Jlow, as calculated on Page 13: (2,475 gpd x 365 days/yr = 903,375 gallons wastewater vs. 895,900 gallons Eto). 4. WASTEWATER SOURCE AND EFFLUENT CHARACTERIZATIONS The wastewater generated from the Church and Multipurpose Building will originate from toilets (water closets), sinks (lavatories), kitchen sinks, etc. The wastewater originating from the Complex is expected to be chemically stronger than residential domestic wastewater, based upon effluent analytical tests from three different Churches within San Joaquin County. Page -11- Chesney Consulting