[1835] Water Witch was a single masted vessel rigged as a cutter built during 1835 in Van Diemen`s Land and sunk in 1842 whilst moored in the River Murray at Moorundie, south of Blanchetown in South Australia (SA). Her wreck site was discovered in 1982 and received statutory protection as a historic shipwreck in 1983. The wreck site was the...
• The stormy petrel. • The dabchick.
Wa'ter witch` (Zoology) (a) The dabchick. (b) The stormy petrel. [ Prov. Eng.] 
[n] - someone who uses a divining rod to find underground water
dowser noun someone who uses a divining rod to find underground water