source of runoff

例句：

1. 1. The river has a significant runoff from the nearby mountains.
   这条河从附近的山脉有大量的径流。
2. 2.The rainwater that collects on the roof is an important source of runoff for the building.
   屋顶上积累的雨水是建筑物的一个重要径流来源。
3. 3. The city's wastewater treatment plant handles a large amount of runoff from the streets and parks.
   城市的污水处理厂处理大量的街道和公园径流。