At 3 a.m. on Sunday morning, I was notified that significant flooding had occurred on the field. At that time we NOTAM closed the facility. By 5:30 a.m. I was at the airport to assess the flooding and damage. The flooding was pretty bad, but not as bad as it was when Floyd came through. (And not as bad as it would get later that day!) The main FBO, Signature Flight Support, had lost the majority of their ramp to flooding and several taxiways were impassable. As the rain tapered off, we met with Signature Representatives to discuss re-opening the facility and handling military/police traffic to assist in rescue efforts. In the hours following the storm, the water rose significantly on the field. We lost several of the taxiways that had been clear to flooding. At 1330 local we opened the facility to police/military aircraft. As the day progressed, we opened the airport to GA aircraft with prior permission only due to the limited ramp space and personnel to handle traffic. As we came toward night, we had to look at closing the facility because our airfield lighting was flooded. At this point the Signature Flight Support ramp had drained enough that helicopters could land on the pavement. The NJ state police requested the airport be left open so they could fuel and conduct rescue operations from the field. Signature flight Support provided a fuel truck on stand by and conducted quick turn-arounds for the helicopters. Their efforts helped the State Police execute a rescue of two individuals from a swollen river near the facility. Without that quick turn-around, the individuals would have died.