Possible Clues:

• Not quite everything contained by flood barriers after a rise — in this?
• See 57-Across
• Marine standard
• Something on the rise today
• It's used in reckoning land elevation
• Land formation measuring standard
• Ben's height is measured relative to this Cork daredevil biker
• Witness told has some neck in between the French and the Spanish indicating how the land lies!
• High ground is above it
• It rises every year