Related Clues:

• Water source
• Subterranean moisture level
• Freshwater source
• What's wet, flat on top and under the ground?
• Ref sent back almost a quid before getting a water supplier
• Water supplier, demanding almost a pound, starts to fill empty reservoirs
• As the Welsh might say, like an aspen where there's water
• Fashion a better law that's important for operating well
• *It's lower during dry seasons
• Underground source of water
• Rock formation showing a peculiar style, mostly containing iron
• Water-bearing layer
• Water-carrying layer of rock
• Level below which terrain is saturated
• A lock closed early with some hesitation - it'll hold water