B737-300 CREW; LNDG IN MODERATE RAIN; FOUND PUDDLING WATER TO THE L OF THE RWY CENTERLINE; ON RWY 25L AT LAS.

Narrative

ON FINAL TO LAS IN MODERATE RA; WE WERE INFORMED BY TWR THAT ANOTHER CARRIER REPORTED 'POOR' BRAKING; BUT ALL PREVIOUS RPTS WERE 'FAIR.' I ASKED FOR TWO ADDITIONAL WIND CHECKS AND CONFIRMED THAT WE WERE WITHIN CROSSWIND LIMITS FOR POOR BRAKING CONDITIONS. AS WE LANDED; I COULD SEE DISTINCT PUDDLE OF WATER AT THE 25L TOUCHDOWN ZONE AND EXTENDING DOWN THE RWY AND IN THE RELATIVE POSITION OF L MAIN GEAR. THE FO OFFSET ABOUT 2 FT R TO KEEP THE L WHEELS OUT OF THE PUDDLE. WE HAD 'GOOD TO FAIR' BRAKING. THE PUDDLE WAS CONTINUOUS; ABOUT 3 FT WIDE; AND PERFECTLY ALIGNED WITH THE TRACK OF THE L MAIN GEAR. THERE WAS NO ASSOCIATED PROBLEM WITH THE R SIDE OF THE RWY. IT IS OBVIOUS THAT THE CROWNING OF THE L (SOUTH) HALF OF THE RWY HAS BECOME COMPROMISED OVER TIME. THIS CREATES A HALF HYDROPLANING PROBLEM THAT NEEDS TO BE ADDRESSED. IF NO RESOLUTION IS FORTHCOMING; I RECOMMEND THAT ALL LNDGS IN MODERATE RAIN BE DIVERTED TO THE REMAINING 3 RWYS AT LAS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE ACFT LNDG AHEAD OF THE RPTR HAD POOR BRAKING ACTION. THE ACFT'S L MAIN GEAR WAS KICKING UP A NOTICEABLE ROOSTER TAIL. BOTH PLTS NOTICED THE PUDDLING WATER. THE PUDDLING WATER BEGAN ABOUT 1000 FT FROM THE END OF THE RWY AND CONTINUED TO THEIR TURNOFF; OFF THE RWY AT A6. THE FLYING FO STEERED THE ACFT TO THE R SIDE OF THE RWY TO AVOID THE PUDDLING WATER.