If it occurs in this river valley but not downstream, then the water is being held back in some way by a heaving river bottom.

如果洪水发生在河谷但不是下游，那么水在某种程度上是被起伏的河底阻挡住而涌回来。

youdao

If it occurs in this river valley but not downstream, then the water is being held back in some way by a heaving river bottom.

如果洪水发生在河谷但不是下游，那么水在某种程度上是被起伏的河底阻挡住而涌回来。

youdao