1877 J. A. Jones in (1889) 16 The cylinder would be provided with valves at various depths below the full tank level.
1927 W. H. Todd 25 The water..had already reached to within a foot or so of the designed full-tank level.
2014 (Nexis) 11 Aug. I pray, the city gets so much rain that the lake attains its full-tank level.