Physical facts about the Great Lakes,,,,,
"  measuremens are in English units (miles), except retention is in years",,,,,
  source: https://www.epa.gov/greatlakes/physical-features-great-lakes,,,,,
,,,,,
lake,avg_depth,max_depth,volume,area,retention
Superior,483,1332,2900,31700,191
Michigan,279,925,1180,22300,99
Huron,195,750,850,23000,22
Erie,62,210,116,9910,2.6
Ontario,283,802,393,7340,6