B717 (Formerly MD-95)
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Executed Go Around / Missed Approach; Flight Crew Landed in Emergency Condition; General Declared Emergency; General Maintenance Action
Aircraft
On approach we got a HYDR QTY LOW alert.  After going around; we continued to run the applicable checklist.  We raised the emergency gear lever leaving the gear doors open after the gear extended.  The aircraft landed and stopped straight ahead.  No turns were made.  We remained on the runway for approximately 45 minutes.  Maintenance arrived and towed the aircraft to the gate where the passengers deplaned.  There were no reports of any injuries and I'm not aware of any damage to the aircraft.  Maintenance indicated leaking hydraulic fluid and possible broken hydraulic line.
B717 Captain experiences a hydraulic low quantity alert during approach and goes around.  An emergency is declared and the emergency gear extension handle is used to lower the gear.  Aircraft is towed to the gate.