DURING DESCENT; AN A320 FLT CREW RECEIVED ECAM WARNING HYD G RES LO. THEY DECLARED AN EMERGENCY; COMPLETED THE ECAM PROCEDURE; AND LANDED.

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DURING DSCNT ECAM HYD G RESERVOIR LOW AIR PRESSURE/OVERHEAT/LOW LEVEL CAME ON. I DIRECTED THE FO TO FOLLOW STEPS AS I WOULD TAKE CARE OF THE FLYING AND COM. ECAM DIRECTED US TO TURN OFF PTU AND GREEN HYD PUMP WITH THE CONSEQUENT LOSS OF ASSOCIATED SYS AND DEGRADATION OF SOME OTHERS. WE ANALYZED AND DISCUSSED AS TO PROPER COURSE OF ACTION SINCE EVEN THOUGH WE HAD THE ECAM HYD QUANTITY WAS STILL SHOWING PLUS WE HAD A GOOD READING OF PRESSURE PREVIOUS PUMP SHUTDOWN (3000 PSI). A HYD LEAK WAS OF COURSE SUSPECTED BUT HOW BAD WE REALLY DID NOT KNOW; STILL THE HYD QUANTITY SEEMED TO STABILIZE AT SOME QUANTITY LOWER THAN THE OTHER SYS. IT MADE RECONSIDER WHETHER TO FOLLOW THE ECAM STEPS OR TO TURN THE PUMP BACK ON LEAVING THE PTU OFF AND GET BACK AS MUCH OF THE SYS AS POSSIBLE. WE OPTED FOR THE LATTER. GIVEN THE CIRCUMSTANCES APCH WAS NOTIFIED THAT WE WERE DECLARING AN EMER REQUESTING EQUIP STAND BY PLUS THE LONGEST AVAILABLE RWY. APCH CHKLISTS WERE ACCOMPLISHED FLT ATTENDANTS WERE NOTIFIED. CONFIGN OF JET; APCH AND LNDG WERE UNEVENTFUL. TAXI TO THE GATE WAS DONE AFTER TESTING BRAKES AND NOSEWHEEL STEERING.