Sentence:  In November 1900 surveying was done under John Marsden on the east mountains to ascertain if it would be possible to get sufficient <WSD>water</WSD> and fall to operate an electric power plant . 
Meaning of the word marked with <WSD> tags:  binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent