Which Reservoir capacity has an Impounded body of water of tumut two pondage?
CREATE TABLE "major_dams_and_reservoirs" (
  "dam_constructed" text,
  "year_completed" real,
  "impounded_body_of_water" text,
  "reservoir_capacity" text,
  "dam_wall_height" text,
  "dam_type" text
);
SELECT "reservoir_capacity" FROM "major_dams_and_reservoirs" WHERE "impounded_body_of_water"='tumut two pondage';