A DEPARTING DHC8 LOST HYD PRESSURE DURING FLAP. AN EMER WAS DECLARED WITH RETURN TO LAND. HYD PRESSURE RETURNED TO NORMAL.

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AFTER TKOF FROM ZZZ; AT FLAP RETRACTION ALT; AFTER ENGAGING FLAPS 0 DEGS; WE HAD A COMPLETE LOSS OF #1 HYD PRESSURE. THIS CAUSED FLAPS TO STOP BTWN 0 DEGS AND 5 DEGS; AS WELL AS #1 ENG HYD PUMP CAUTION LIGHT AND OTHER #1 HYD SYS FAILURE CAUTION LIGHTS. AFTER COMPLETING THE AFTER TKOF CHK; WE COMPLIED WITH THE QRH PROCS FOR #1 ENG HYD PUMP FAILURE. AFTER THIS; WE DECLARED AN EMER WITH ATC; NOTIFIED THEM OF OUR RETURN TO ZZZ; AND THAT WE WOULD BE STOPPING ON THE RWY DUE TO PROBABLE LOSS OF ANTI-SKID/NORMAL BRAKING AND NOSE STEERING. WE THEN NOTIFIED THE FLT ATTENDANT AND PAX OF THE SITUATION; BRIEFED THE APCH AND FLAPLESS LNDG; AND RETURNED TO ZZZ. WE ALSO TALKED TO DISPATCH AND MAINT TO VERIFY ALL APPROPRIATE ACTIONS WERE TAKEN. AS WE APCHED FINAL; I NOTICED WE HAD #1 HYD PRESSURE AND THAT ALL CAUTION LIGHTS WERE OUT. I EXECUTED A FLAPLESS LNDG WITHOUT INCIDENT AND HAD NORMAL BRAKING ON THE ROLLOUT. WE STOPPED ON THE RWY. I DECIDED TO HAVE THE ACFT TOWED TO THE GATE AS I DIDN'T WANT TO LOSE #1 HYD PRESSURE AGAIN AND HAVE BRAKING PROBS ON A CONGESTED RAMP.