Water flowed into nearby rivers causing the heaviest flooding on the Shenandoah and the Rappahannock rivers.
(Water; flowed; into nearby rivers) (nearby rivers; causing; the heaviest flooding on the Shenandoah and the Rappahannock rivers)
Water nearby rivers
flowed causing
into nearby rivers
the heaviest flooding on the Shenandoah and the Rappahannock rivers