P80 DEP CTLR OBSERVES ANOTHER P80 CTLING AN LJ35 CONFLICT WITH HIS DHC8 AS INTRAFAC COORD PROCS ARE NOT ENSURED.

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I WAS WORKING A COMBINED S ARR/DEP SECTOR AT PORTLAND TRACON (P80). PDX TWR DEPARTED AN ACR DH8A OFF RWY 28L ON A 260 DEG HDG PER LCL DIVERGING DEP PROCS. ACFT DEPARTING PDX MUST BE ABOVE 3000 FT IN THIS AREA BEFORE A TURN CAN BE ISSUED DUE TO TERRAIN. THE DH8 WAS CLBING SLOWER THAN NORMAL BUT NOT SLOWER THAN EXPECTED FOR THIS MODEL DASH ON A HOT DAY. THE CTLR WORKING THE ADJACENT SECTOR (NEWBERG) RELEASED AN LR35 OFF OF HIO RWY 30 ON A CANBY 6 DEP CLBING TO 3000 FT. THE NEWBERG SECTOR OWNS 4000 FT AND BELOW IN THAT AREA AND THE STANDARD RELEASE ALT FOR THAT DEP PROC IS 4000 FT; ALTHOUGH 3000 FT IS AN AVAILABLE ALT. THE AIRSPACE THIS ACFT WAS RELEASED INTO IS KNOWN TO BE AN AREA OF POOR RADAR COVERAGE. RADAR ACQUISITION OF ACFT IS GENERALLY MADE AT 2500-3000 FT. BY THE TIME AN ACFT CAN BE RADAR IDENTED AND POINTED OUT/HANDED OFF; THEY ARE IN; OR VERY NEARLY IN; THE S DEP CTLR'S AIRSPACE. THIS IS ESPECIALLY TRUE OF HIGH PERFORMANCE ACFT. SINCE WE AS CTLRS DON'T KNOW HOW SLOW/FAST THE ACFT WILL CLB OR HOW WIDE THE ACFT MAY TURN; IT IS A COMMON TECHNIQUE AMONG VETERAN PROFESSIONAL CTLRS TO ADVISE THE S DEP CTLR (RWY 28 FLOW) AND THE FINAL CTLR (RWY 10 FLOW) PRIOR TO RELEASING AN ACFT OFF RWY 30 ON A CANBY DEP PROC. THE ACR DH8 I WAS WORKING WAS APPROX 7-8 MI SW OF PDX WHEN THEY PASSED 3000 FT. I ISSUED A 'TURN L HDG 210 DEGS' TO VECTOR THE ACFT TO THEIR ON COURSE RTE. WHILE XMITTING THE VECTOR I NOTICED AN ARTS DATA TAG APPROX 3 MI W OF THE DH8'S POS CONVERGING AT 3100 FT SO I IMMEDIATELY ISSUED TFC. ASSUMING THE LR35 WAS CLBING TO 4000 FT I JUMPED UP OUT OF MY CHAIR AND PHYSICALLY POINTED OUT THE CONFLICTION TO THE OTHER CTLR. THE RESPONSE I GOT WAS; 'YEAH; I KNOW THAT'S WHY I STOPPED HIM AT 3000 FT.' I WENT BACK TO MY SCOPE AND CALLED THE TFC ONCE AGAIN HOPING FOR A VISUAL SPOTTING. I FELT THERE WAS NO OTHER COURSE OF ACTION AT THIS TIME AS THE LR35 WAS ON A 110 DEG TRACK AND THE DH8 WAS ON A 210 DEG TRACK -- THE PROVERBIAL T-BONE. THE DH8 PLT RPTED (RELUCTANTLY) THE LR35 ACFT IN SIGHT. I CALLED THE WATCH SUPVR OVER AND ASKED HER TO FIND OUT IF THE LR35 HAD THE DH8 IN SIGHT BECAUSE I COULDN'T GUARANTEE I HAD ANY OTHER FORM OF SEPARATION. THE NEWBERG CTLR SAID THE LR35 HAD THE DH8 IN SIGHT. IN A LATTER MEETING WITH THE NEWBERG CTLR; IT WAS POINTED OUT THAT PART OF HIS RESPONSIBILITY IN APPLYING VISUAL SEPARATION IS TO INFORM THE OTHER ACFT THAT VISUAL SEPARATION IS BEING APPLIED. SINCE THE ACFT WAS NOT ON HIS FREQ; COORD WITH THE APPROPRIATE CTLR WAS REQUIRED. THE LACK OF MANDATORY INTERNAL COORD WHILE USING THIS DEP PROC IS BAD PROC AT BEST. I WILL WORK WITH MGMNT TO CHANGE THE WAY IFR ACFT GET RELEASED FROM HIO OFF RWY 30 ON THE CANBY DEP PROC; IF AT ALL.