Possible Clues:

• "A man, a plan, a ____, Panama" (famous palindrome)
• Waterway is able to dock everything
• Connecting waterway
• Venetian waterway
• Pelican allowed part in channel
• Is a pound able to hold water?
• Is a half-century enough to be able to dig it?
• Water there for a dugout
• Is a pound able to go by way of water?
• Is a pound able to get there by way of water?