B767-300 FLT CREW HAD FLUID LEAKING FROM THE LEFT WING ON DEPARTURE; AFTER BEING NOTIFIED BY TOWER OF THE LEAK; THEY RECEIVED A CENTER HYDRAULIC QUANTITY MESSAGE. FLT CREW RETURNED TO DEPARTURE AIRPORT AND MADE AN UNEVENTFUL OVERWEIGHT LANDING.

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AFTER TKOF FROM ZZZ THE TWR INFORMED US THAT ANOTHER ACFT SAW FLUID 'SPEWING' FROM OUR L WING DURING TKOF. THE RPT WAS DISCONCERTING; BUT WE NOTED NO ABNORMALITIES. CLBING THROUGH ABOUT 5000 FT; WE RECEIVED A CTR HYD QUANTITY MESSAGE AND LIGHT. WE CONFIRMED WE WERE LOSING FLUID ON THE STATUS PAGE; SO WE PULLED OUT THE HYD QUANTITY AND CTR HYD SYS PRESSURE CHKLISTS. BEFORE REACHING 10000 FT WE HAD ALSO LOST CTR HYD PRESSURE. WE RAN THE CHKLISTS; NOTIFIED ATC OF OUR PROB AND DECLARED AN EMER. WE REQUESTED AND WERE CLRED TO RETURN TO ZZZ WHERE THE WX WAS CLR WITH CALM WINDS. I NOTIFIED ACR DISPATCH VIA ACARS OF OUR PROB AND INTENTIONS AND THEY ACKNOWLEDGED. I ALSO SENT AN ACARS DIVERT MESSAGE. WE ELECTED NOT TO DUMP FUEL AS WE FIGURED AND WE WOULD BE RIGHT ABOUT AT MAX LNDG WT. WE CONFIGURED THE ACFT ACCORDING TO THE CHKLIST AND LANDED SAFELY. OUR LNDG WT WAS 326500 LBS; 500 LBS OVER MAX LNDG WT; WHICH I ALSO WROTE UP IN THE LOGBOOK. I BELIEVE WE; AS A CREW; WORKED THE PROB WELL TOGETHER AND HAD A SUCCESSFUL OUTCOME. I ALSO BELIEVE OUR DECISION TO RETURN TO ZZZ WAS A SOUND ONE VERSUS CONTINUING. THE CTR SYS IS THE 'HVY' SYS ON THE B767 AND I FELT THE SAFEST COURSE OF ACTION WAS TO RETURN TO AN ACR HUB ARPT WE HAD JUST DEPARTED FROM WHERE THE WX WAS EXCELLENT AND HAS A LONG RWY. I ALSO FEEL WE FOLLOWED PROCS TO THE SAFEST EXTENT DURING THIS EVENT. WE FIGURED WE WERE VERY CLOSE TO MAX LNDG WT AND DUMPING FUEL WOULD NOT BE NECESSARY AS RWY AVAIL WAS MORE THAN WAS REQUIRED UNDER OUR CIRCUMSTANCES.