The water level of the Mississippi River is already 6.5 feet below normal.

密西西比河的水位已经比正常水位低6.5英尺。

There wasn't enough difference between the height of the ground level and the water level.

地面高度与水位没什么明显的区别。

The water level has risen.

水位高涨。

According to Fan, changing the water level strains them.

根据范晓的说法，水位的改变使断层紧绷。

45 min the water level in the primary loop continues to drop.

45分钟主回路的水位继续下降。