The drainage system of incomplete sewage diversion system is only equipped with a simple sewage diversion drainage system, without a complete rainwater drainage system. All kinds of sewage are directly sent to the larger sewage plant through a simple sewage diversion drainage system, and then discharged into the smaller water body after sewage treatment; The rest of the rainwater directly enters the open channel or a small river without drainage system through the overland flow system on the ground, and then directly enters the larger redundant water body.<br>
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