(Rated and ordered by Andy)

Jack n Jill (skill:6, thought:3)
Waterfalls (skill: 6, thought: 4)
Underfloor heating (skill:6, thought: 5)
Dambusters (skill: 8, thought: 6)
Escape from Shurrapak (skill: 7, thought: 5)
Fiery Finish (skill:6, thought: 7)
Aquifer (skill:7, thought: 7)
Geyser (skill: 7, thought: 8)
Quick Dig (skill: 8, thought: 8)
Nice cup of tea (skill:8, thought: 8)
Under pressure (skill: 8, thought: 8)
Water tower (skill:6, thought: 8)
Underworld (skill: 5, thought: 8)
The Gauntlet (skill: 7, thought: 9)
Dive (skill: 8, thought: 9)
Out of the Frying Pan (skill: 8, thought: 9)
Burst water main (skill: 9, thought:10-dubious)
Infiltrate (skill: 9, thought: 10)
Nasty cup of tea (skill: 9, thought: 10)
Glass half full (skill:8, thought: 11)