depth of drainage pipe

例句：

1. 1.The depth of the river is about 20 meters.
   这条河的深度大约是20米。
2. 2. The engineer measured the depth of the well and found it to be 50 feet.
   工程师测量了井的深度，发现它有50英尺深。
3. 3. The construction of the new highway will increase the depth of the road.
   新高速公路的建设将增加道路的深度。