upstream face造句怎么写

There are many treatment method for seepage of concrete dam body. Blocking at upstream face and drainage at downstream face is one generally adopted.

There were 20 cracks at upstream face dam head of Huanren dam during construction which threatened dam safety.

It was theorized with a high degree of probability that the change in period was due to the nonlinearity of the hydrodynamic pressure acting on the upstream face of the dam.