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Equalization Volume = 1284 Gallons ** <br /> Emergency Storage Volume = 1000 Gallons *(highest daily flow) <br /> Adding the volumes yields a required dosing/equalization tank volume of 3003 <br /> Gallons. <br /> Dosing Regime: 179 gallons every 12 hours. Given a measured pump delivery <br /> rate of 40 gpm, the repeat cycle timer would be set at 4.5 minutes "on" and 12 <br /> hours (or 11.9 hours) "off'. <br /> Example#2 (Day School): <br /> Assume: 200-student day school (no food service or gym). The daily design flow <br /> is 10 gallons/student. The site has a clay(Group IV) soil. The school has classes <br /> Monday through Friday <br /> Day Attendance Dail <br /> Monday 200 students 2000 gallons <br /> Tuesday 200 students 2000 gallons <br /> Wednesday 200 students 2000 gallons <br /> Thursday 200 students 2000 gallons <br /> Friday 200 students 2000 gallons <br /> Weekly Total: 10,000 gallons <br /> Equalization cycle is 1 week(7 days) <br /> Equalized Daily Flow: 10,000 gallons/7 days = 1429 gallons/day <br /> The drainfield is sized for a daily waste flow of 1429 GPD. <br /> Trench bottom area is: 1429 gpd/0.3 LTAR=4763 ft2. <br /> Linear footage: 4763 ft2/3 feet wide trenches= 1588 ft. <br /> Dosing Volume: 714.5 gallons (69% of 4" corrugated drainline capacity) <br /> Flow Balance: <br /> Day In Out Residual <br /> Monday 2000* 1429 gal 571 gal. <br /> Tuesday 2000 1429 gal 1142 gal <br /> Wednesday 2000 1429 gal 1713 gal <br /> Thursday 2000 1429 gal 2284 gal <br /> Friday 2000 1429 gal 2855 gal** <br /> Saturday 0 1429 gal. 1426 gal <br /> Sunday 0. 1429 gal 0 gal. <br /> Total: 10,000 gal. 10,003 gal 0 gal <br /> 7 <br /> 107 <br />