DH-8-100 LOSES ITS #1 HYD SYS FLUID.

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ENRTE FROM BOSTON TO HARRISBURG INTL BTWN WILKES-BARRE AND HARRISBURG WE NOTICED THE #1 HYD SYS QUANTITY WAS SLOWLY DROPPING BUT THE MAIN SYS PRESSURE WAS READING NORMAL 3000 LBS. I MADE THE WRITE-UP AND RADIOED IT INTO MDT MAINT. AFTER THAT; I CALLED THE FLT ATTENDANT TO THE COCKPIT AND BRIEFED HER ON THE SIT AND WE BEGAN DISCUSSING CONTINGENCY PLANS AND PROCS SHOULD THE #1 HYD SYS PRESSURE ACTUALLY DROP OFF. I MADE THE DECISION TO; AS A SAFETY PRECAUTION; HAVE THE FLT ATTENDANT BRIEF THE PAX IN BRACE PROC AND DISCUSSED THE BRACE SIGNAL AND WHEN TO EXPECT IT SHOULD THE NEED ARISE TO DO SO. APPROX 10 MI FROM THE MDT ARPT AND BEING VECTORED FOR THE VISUAL APCH TO RWY 13; THE #1 HYD SYS PRESSURE DROPPED TO ZERO WITH THE APPROPRIATE CAUTION LIGHTS ILLUMINATING. AT THAT POINT; WE EXECUTED PREARRANGED PROCS AND EXECUTED THE LOSS OF HYD PRESSURE -- ONE SYS CHKLIST ALONG WITH THE RUDDER PRESSURE/RUDDER FULL PRESSURE ABNORMAL CHKLIST. THE EMER VEHICLES WERE REQUESTED TO STAND BY AND THE PAX WERE PUT IN THE BRACE POS JUST PRIOR TO LNDG. I REQUESTED AN ILS 13 MDT APCH WITH A TURN ON AT THE MARKER TO STABILIZE OUR APCH AS MUCH AS POSSIBLE. THE ZERO FLAP LNDG WAS NORMAL FOR THE SIT AND WE TAXIED TO THE GATE WITHOUT FURTHER INCIDENT. TO SUMMARIZE; BEING A PLANNED INCIDENT AND HAVING THE TIME TO THINK AND PLAN OUT OUR OPTIONS WAS A BIG ASSET IN THIS SIT. ALSO; GETTING ALL 3 CREWMEMBERS INVOLVED AT THE START AND GETTING ALL THE INPUT HELPED MAKE THE OUTCOME A SAFE ONE. LNDG AT A FAMILIAR ARPT WITH 10000 PLUS FT OF RWY HELPED.