伏流,潜流;
In rainy days, the system keeps as much water as possible for irrigation, and the surplus water is drained out through deep drainage wells when stream forms in the underground drain.
下雨时,该系统保持尽可能多的水供灌溉用,当地下排水沟形成径流时,雨洪经各渗井流入深埋排水竖井,流出团城。
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