| 摘要 |
The main trunk line of a sewer system is divided into serially connected sections and a predetermined hydrostatic head is established at the upstream end of each section. Sewage flow is restricted at the downstream end of each section, to maintain a pressure gradient along the flow path in each section. This maintains sewage flow in the trunk line despite the absence of an elevational gradient. Feeder lines are connected to the trunk line in relation to the pressure gradient such that back flow from the trunk line into the feeder lines is substantially inhibited without requiring check valves.
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