CREATE TABLE table_30696 ("Reservoir" TEXT, "Basin" TEXT, "Location" TEXT, "Type" TEXT, "Height  ( m ) " TEXT, "Length along the top  ( m ) " TEXT, "Drainage basin  ( km\\u00b2 ) " TEXT, "Reservoir surface  ( ha ) " TEXT, "Volume  ( hm\\u00b3 ) " TEXT)

What is the volume when the resrvoir is Tanes?
SELECT "Volume (hm\u00b3)" FROM table_30696 WHERE "Reservoir" = 'Tanes'
SELECT "Volume (hm\u00b3)" FROM "table_30696" WHERE "Reservoir" = 'Tanes'