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Example#1 (Church): <br /> Assume: 200-seat church with a kitchen. The daily design flow is 5 gallons/seat. <br /> The site has a clay(Group IV) soil. The church has services on Sunday and <br /> Wednesday with extracurricular events (weddings, reunions, suppers, etc.) on <br /> Saturdays. Sunday attendance: 200 members; Wednesday attendance: 100 <br /> members and Saturday events: 200 members. <br /> Day Attendance Dail <br /> Sunday 200 members 1000 gallons <br /> Wednesday 100 members 500 gallons <br /> Saturday 200 members 1000 gallons <br /> Weekly Total: 2500 gallons <br /> Equalization cycle is 1 week(7 days) <br /> Equalized Daily Flow: 2500 gallons/7 days = 358 gallons/day <br /> The drainfield is sized for a daily waste flow of 358 GPD. <br /> Trench bottom area is: 358 gpd/0.25 LTAR= 1432 ft2. <br /> Linear footage: 1432 ft2/3 feet wide trenches=477 ft. <br /> Dose Volume: 179 gallons (58% of 4" corrugated drainline capacity) <br /> Flow Balance: <br /> Day In Out Residual <br /> Saturday 1000 gal.* 358 gal. 642 gal <br /> Sunday 1000 gal. 358 gal. 1284 gal.** <br /> Monday 0 358 gal 926 gal. <br /> Tuesday 0 358 gal 568 gal. <br /> Wednesday 500 358 gal 710 gal <br /> Thursday 0 358 gal 352 gal <br /> Friday 0 35� 0 <br /> Total: 2500 gal. 2506 gal 0 gal <br /> Pump Tank Sizing <br /> Assuming a pump height of 18" and a tank with 30 gallons per inch: <br /> Pump submergence volume = 540 Gallons <br /> Dose Volume = 179 Gallons <br /> 6 <br /> 106 <br />