surface runoff

例句：

1. 1. The rainwaterthat runs off the roof is collected ina barrel.
   屋顶上的雨水被收集在一个桶里。
2. 2. The surface runoff from thestorm drains into the river.
   暴风雨后的排水流入了河流。
3. 3. The surface runoffof the melted snow is expected to besignificant.
   融化的雪的表面径流量预计将很大。