The river draws its water mainly from natural groundwater springs, snow melt, and rain water.
en.wikipedia.org What a wonderful tonic to be exposed to bright sunshine, drenching rain, choking dust, dripping fog, rigid air, punishing winds!
en.wikipedia.org At times, they can grow severe, bringing gusty winds, small hail, and torrential rain, and an occasional tornado.
en.wikipedia.org A sudden thaw occurred over New Year's Eve 1928, followed by unusually heavy rain, doubling the volume of water coming down the river.
en.wikipedia.org