PILATUS PC12 FLT CREW ENCOUNTER WATER ON RWY AND HYDROPLANES AT CDW.

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OUR 14 CFR PART 91 FLT FROM PVD TO CDW WAS HANDED OFF BY NEW YORK APCH CTL TO THE CALDWELL TWR APPROX 2.0 NM OUTSIDE THE SNAFU FAF ESTABLISHED ON AND CLRED FOR THE LOC RWY 22 APCH AT CALDWELL. TWR ACKNOWLEDGED OUR RADIO CALL; CLRED US TO LAND; AND ADVISED US OF A NOTAM FOR THE CLOSURE OF SEVERAL TXWYS DUE TO FLOODING; ADDING THAT WE SHOULD EXPECT TO BACK-TAXI RWY 22 AFTER LNDG. TWR ALSO PROVIDED AT LEAST 2 WIND CHKS; WHICH INDICATED A SLIGHT QUARTERING TAILWIND. THE CAPT; THE PF; LANDED THE AIRPLANE SMOOTHLY AT PROPER TOUCHDOWN SPD APPROX 1000 FT DOWN THE 4418 FT LONG (LNDG DISTANCE) RWY 22 AND PROMPTLY APPLIED A MODERATE AMOUNT OF REVERSE THRUST TO DECELERATE. HE LATER RPTED HAVING MADE NO USE OF THE WHEEL BRAKES DURING THE INITIAL LNDG ROLL; WHICH IS CONSISTENT WITH OUR SOP AND THE POH FOR THE PC-12. WITH APPROX 2500 FT OF RWY REMAINING; AT A SPD OF BTWN 50-60 KTS; THE AIRPLANE PLOWED INTO DEEP PONDING WATER; HYDROPLANED OUT OF CTL; AND BEGAN DRIFTING TOWARD THE L EDGE OF THE RWY. AFTER SEVERAL SECONDS; AS THE AIRPLANE ENCOUNTERED SHALLOWER WATER AND OR DECELERATED FURTHER; THE CAPT WAS ABLE TO REGAIN LATERAL CTL; BUT THE ENG HAD BEGUN TO SPOOL DOWN FOLLOWING AN APPARENT FLAMEOUT CAUSED BY THE INTAKE OF EXCESSIVE WATER. AFTER ADVISING TWR OF OUR SITUATION AND THE NEED TO SHUT DOWN FOR AN ENG RELIGHT WHILE STILL ON THE RWY; WE SLOWED TO A STOP AND COMPLETED THE SHUTDOWN AND ENG START CHKLISTS BEFORE TAXIING TO PARKING. BORESCOPE INSPECTION BY EXPERT PT-6 TECHNICIANS 2 DAYS AFTER THE INCIDENT REVEALED NO DAMAGE TO THE ENG; BUT THE REAL DISASTER THAT WAS AVERTED THAT AFTERNOON WAS A LNDG ACCIDENT ON A RWY WHICH SHOULD HAVE BEEN NOTAM'ED CLOSED. ARPT MGMNT AND TWR PERSONNEL WERE CONSULTED IMMEDIATELY AFTER THE ACFT WAS PARKED; AND THE RWY IS BELIEVED TO HAVE BEEN CLOSED AFTER OUR ARR; BUT IT IS THE STRONG OPINION OF THIS FLT CREW THAT THE RWY SHOULD HAVE BEEN INSPECTED MORE CAREFULLY AND CLOSED MORE PROACTIVELY.