Possible Clues:

• Before a long time, lake lost because of this?
• Lake’s troubled period: why it is losing water?
• Unwanted discharge of fluid
• Fluid loss
• Escaping fluid
• Discharge rates oddly ignored in contamination of Great Lakes
• Discharge
• Security problem for some time needs plugging
• Unauthorised disclosure over time causes a loss in liquid assets
• Wild eagle consuming a bit of kitten making unintended escape