. Cassier's magazine . avation was required forthe dam at Rainbow, as solid bedrock was already exposed across theentire site. The same solid rockfoundation exists at the Big Falls,,as well as the intermediate falls be-tween Rainbow and Big Falls, thus,furnishing an unusually good founda-tion for both dams and power houses,at the very lowest cost. FLOW OF THE RIVER The preceding figures of availablepower are based on a minimum flowof the river of 2,300 cubic feet persecond. Only a very few times dur-ing the last five years has the flowbeen less than the assumed mini-mum, and then for only a sh
. Cassier's magazine . avation was required forthe dam at Rainbow, as solid bedrock was already exposed across theentire site. The same solid rockfoundation exists at the Big Falls,,as well as the intermediate falls be-tween Rainbow and Big Falls, thus,furnishing an unusually good founda-tion for both dams and power houses,at the very lowest cost. FLOW OF THE RIVER The preceding figures of availablepower are based on a minimum flowof the river of 2,300 cubic feet persecond. Only a very few times dur-ing the last five years has the flowbeen less than the assumed mini-mum, and then for only a shorttime. With the amount of storageavailable these short low-water pe-riods can easily be bridged over, so-that the true working minimum withthe plant in operation will probablybe nearer 2,500 cubic feet per sec-ond than 2,300. RAINBOW DEVELOPMENT The development at Rainbow wasstarted October, 1908, and completedJuly, 1910. It has a total capacityof 21,000 kilowatts in generators and36,000 horse-power in waterwheels„. fia/nbo* Mo/ember/, /9/Q MAP OF POWER DEVELOPMENT, RAINBOW FALLS GREAT FALLS POWER PLANT 277
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