FIG. 7.21.11 Septic tank and disposal field flow sheet.
tile field for disposal. At least two seepage pits are provided, and they are alternately dosed.
The function of the dosing tank is to furnish a sufficient flow rate to use the full tile field or seepage pit. When a dosing chamber is absent, the head reach of the field tends to become overloaded. Since the septic tank almost always operates without power, an automatic siphon is used for dosing by discharging the chamber contents each time the level reaches a fixed point. The distribution box proportions sewage flow between the individual tile lines.
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