. Water Supply and Irrigation Papers of the United States Geological Survey . A. RUMFORD FALLS, LOOKING DOWNSTREAM TOWARD MIDDLE-LEVEL li. SACO RIVER BELOW SALMON FALLS DAM. PRESSEY.] ANDROSCOGGIN RIVER. 77 Gage ratings are taken at the lower dam. At first they were madeonce a day, later four times a day, and now every two hours. Flash-boards are not used on the dam. There is but little fluctuationduring the twenty-four hours in the quantity passing the weirs; infact, there is not much fluctuation anywhere upon the river except atand below Lewiston, where a large proportion of the mill
. Water Supply and Irrigation Papers of the United States Geological Survey . A. RUMFORD FALLS, LOOKING DOWNSTREAM TOWARD MIDDLE-LEVEL li. SACO RIVER BELOW SALMON FALLS DAM. PRESSEY.] ANDROSCOGGIN RIVER. 77 Gage ratings are taken at the lower dam. At first they were madeonce a day, later four times a day, and now every two hours. Flash-boards are not used on the dam. There is but little fluctuationduring the twenty-four hours in the quantity passing the weirs; infact, there is not much fluctuation anywhere upon the river except atand below Lewiston, where a large proportion of the mills run only inthe daytime, while elsewhere the mills run continuously through theweek. At Rumford Falls many of the turbines run throughout theweek without change of gate, and some of them run for a month ortwo at a time without stopping. Notwithstanding the fact that ahigh degree of accuracy is not expected, and doubtless is not claimedfor results obtained by this method, in which, for example, theproper weir coefficient to be used is in doubt, the results obtained atRumford Falls are of high value as giving a good approximation ofthe a
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