[honway]

The waterlines were severed by the plane impact.

Do you base that on the conclusion that the plane impacted at the location of the waterlines and all the waterlines were located in one place?

The reason I ask is because the two different towers were impacted in two different locations.

[Poohbah]

Do you base that on the conclusion that the plane impacted at the location of the waterlines and all the waterlines were located in one place?

No, it means that the sprinkler systems on the floors actually hit were rendered inoperative. F = M*A and all that.

[habs4ever]

The water was gushing down some stairwells and wasn't going through the sprinklers, according to some of the stories I have bookmarked on my page.