排水流 meaning in English

discharge current

During wet weather , the flows in the communal drainage system will increase substantially , thereby dispersing and diluting any wastewater therein . after the wastewater has been discharged into the sea , most viruses in the seawater will eventually be killed by the ultraviolet radiation of sunlight and therefore public health should not be affected
在雨天时，由于排水渠的水流量增加，渠内的污水会被收集到的雨水冲散及稀释，排水流到海里后，水中的病毒受到阳光中的紫外线照射一般便会逐渐死亡，所以不会影响公众健康。