Source : Webster's Revised Unabridged Dictionary (1913)

Sluice \Sluice\, v. t. [imp. & p. p. {Sluiced}; p. pr. & vb. n.
   {Sluicing}.]
   1. To emit by, or as by, flood gates. [R.] --Milton.

   2. To wet copiously, as by opening a sluice; as, to sluice
      meadows. --Howitt.

            He dried his neck and face, which he had been
            sluicing with cold water.             --De Quincey.

   3. To wash with, or in, a stream of water running through a
      sluice; as, to sluice eart or gold dust in mining.

Source : WordNet®

sluicing
     adj : pouring from or as if from a sluice; "the sluicing rain"