AN AIRBUS A320 ON TKOF CLB AT 3000 FT LOST YELLOW HYD SYS QUANTITY AND PRESSURE. EVALUATED SYS LOSS WITH MAINT AND DISPATCH AND ELECTED TO CONTINUE FLT TO DEST.

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DURING CLBOUT AND ACCELERATION; THE FLAPS WERE RETRACTED ON SCHEDULE. AS THE FLAPS MOVED; WE RECEIVED AN ECAM MESSAGE INDICATING THAT THE YELLOW HYD RESERVOIR WAS LOW (HYD YELLOW RESERVOIR LOW LEVEL). THIS WAS SOON FOLLOWED BY A LOW PRESSURE MESSAGE. I PLACED THE ACFT ON AUTOPLT AND INSTRUCTED THE FO TO COMPLETE THE ECAM PROC. ONCE COMPLETE; THE INOP SYS WERE REVIEWED AND THE STATUS OF THE 2 REMAINING HYD SYS WAS EVALUATED. WE CALLED DISPATCH AND APPRISED THEM OF THE SIT. DISPATCH IN TURN CONTACTED OUR LINE MAINT AND THE PROB WAS AGAIN REVIEWED VIA THE CONFERENCE CALL. INITIALLY WITH THE LOSS OF THE YELLOW SYS; I WAS PREPARED TO RETURN TO IAD. HOWEVER; AFTER REVIEW OF ALL PERTINENT INFO; THE FO AND I AGREED THAT THE FLT COULD SAFELY CONTINUE TO THE DEST. THE FACTORS WE CONSIDERED WERE THE FACT THAT THE GREEN AND BLUE HYD SYS WERE FUNCTIONING NORMALLY AND SUFFERED NO LOSS OF FLUID; NO MAJOR COMPONENTS WERE LOST DUE TO THE FAILURE; AND A RETURN TO IAD WOULD REQUIRE AN OVERWT LNDG CLOSE TO 20000 LBS OVER MAX LNDG WT. ALSO; THE WX ENRTE TO THE DEST WAS EXCELLENT WITH PLENTY OF SUITABLE ALTERNATES AVAILABLE. I INFORMED DISPATCH THAT IT WAS MY INCLINATION TO CONTINUE TO THE DEST AND DISPATCH AGREED. THE FLT CONTINUED TO THE DEST AND LANDED WITHOUT FURTHER INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED MAINT DID NOT ADVISE THE EXACT COMPONENT THAT CAUSED THE LOSS OF HYD FLUID; BUT DID INDICATE IT WAS LOCATED IN THE RESERVOIR FILL LINE.