A DASH 8 Q200'S ENG FAILED BENIGNLY DURING DSCNT FOR LNDG. AN EMER WAS DECLARED FOLLOWED BY AN UNEVENTFUL LNDG.

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INITIALLY DURING OUR DSCNT FROM 16000 FT MSL ON OUR WAY TO ZZZ AT ROUGHLY 15000 FT MSL; THE EVENT OCCURRED. WE WERE IN ICING CONDITIONS; BUT NO ICE WAS ACCUMULATING. WE WERE IN VERY LIGHT TURB AT THE TIME AS WELL. THE EVENT STARTED AS THE #1 TORQUE GAUGE SLOWLY BLEEDING OFF. (WE WERE AT A PWR SETTING OF ROUGHLY 90% TORQUE AT THE TIME.) THEN WE NOTICED THE #1 FUEL FLOW GAUGE ALSO BLEEDING OFF. (WE WERE AT A FUEL FLOW OF ROUGHLY 650 PPH.) AT ROUGHLY 25% TORQUE AND 250 PPH FUEL FLOW; WE NOTICED A SLIGHT YAW BEGINNING TO OCCUR AND I CALLED FOR THE #1 ENG FAILURE CHKLIST. WE RAN THE CHKLIST; SHUT DOWN THE #1 ENG; AND DECLARED AN EMER. (ADDITIONAL CHKLIST RAN WERE THE ENG CLEANUP ITEMS CHKLIST AND THE SINGLE ENG LNDG CHKLIST AND ITS ASSOCIATED PARTS.) WHILE BTWN CHKLISTS; I INFORMED OUR FLT ATTENDANT; 'WE HAD AN ENG FAILURE. WE ARE PLANNING A NORMAL DEPLANING AFTER WE SHUT DOWN ON THE RWY AND DEPLANE. WE HAD JUST OVER 5 MINS FOR HER TO GET READY. AND THAT WE WOULD GET BACK TO HER PRIOR IN ABOUT 5 MINS.' I ALSO REASSURED HER THAT THE ACFT WAS ALRIGHT; OTHER THAN THE FAILED ENG. WE RAN ASSOCIATED CHKLISTS; GOT A HOLD OF DISPATCH AND OPS; AND PROCEEDED IN FOR A SINGLE ENG ILS APCH. WE SHOT THE ILS APCH AND LANDED UNEVENTFULLY. WE PROCEEDED TO SHUT DOWN ON THE RWY WITH CRASH; FIRE; RESCUE ALREADY ON SCENE. THIS TOOK A FEW MOMENTS TO COLLECT OUR THOUGHTS AND SHUT DOWN THE #2 ENG; DUE TO AN EXCESS AMOUNT OF ADRENALINE FLOWING. AFTER CRASH; FIRE; RESCUE ASSURED US THE ACFT WAS SECURE; WE SHUT THE ACFT DOWN; I OPENED THE FLT DECK DOOR; SPOKE BRIEFLY TO THE PAX (APOLOGIZING FOR EXCITING EVERYONE; ASSURING THEM EVERYTHING WAS OK; AND INFORMING THEM IT WOULD BE A FEW MORE MOMENTS AND WE WOULD BE TOWED IN). I OPENED THE MAIN CABIN DOOR; SPOKE TO THE CRASH; FIRE; RESCUE INCIDENT COMMANDER BRIEFLY; AND TALKED FACE-TO-FACE WITH THE ZZZ ACR ESCORT TEAM; TOW TEAM. WE WERE TOWED IN UNEVENTFULLY AND PAPERWORK -- PHONE CALLS ENSUED. AS A SIDE NOTE; WE CHOSE TO SHUT DOWN ON THE RWY BECAUSE: 1) WE WANTED TO MAKE SURE THAT IF WE HAD INADVERTENTLY MISSED ANYTHING DUE TO EXCESS ADRENALINE; WE WOULD NOT HAVE AGGRAVATED THE SITUATION TRYING TO DO TOO MUCH OR 2) IF WE HAD INADVERTENTLY MISSED ANYTHING DUE TO HAVING JUST PREVIOUSLY COMPLETED A 12 HR DAY WITH A 9 HR OVERNIGHT.