Question: Which Year completed has a Dam type of Concrete gravity, and an Impounded body of water of Deep Creek Reservoir?
SQL: SELECT MIN("Year completed") FROM "2-177948-2" WHERE "Dam type" = 'Concrete gravity' AND "Impounded body of water" = 'Deep Creek Reservoir';

Question: Which dam type was completed in 1961?
SQL: SELECT "Dam type" FROM "2-177948-2" WHERE "Year completed" = 1961.0;

Question: Which Year completed has a Dam type of Earthfill embankment, and a Dam constructed of Khancoban Dam?
SQL: SELECT MAX("Year completed") FROM "2-177948-2" WHERE "Dam type" = 'Earthfill embankment' AND "Dam constructed" = 'Khancoban Dam';

Question: Which Reservoir capacity has an Impounded body of water of Tumut Two Pondage?
SQL: SELECT "Reservoir capacity" FROM "2-177948-2" WHERE "Impounded body of water" = 'Tumut Two Pondage';