. Bulletin - New York State Museum. Science. 414 NEW YORK STATE MUSEUM From the date of establishing the station at Dolgeville in 1898 to June 1, 1899, the discharge was computed from a curve derived from Cornell University experiment No. 13. From June, 1899, it has been computed from a revised curve, based on experiments by John R. Freeman on a model of the round-crested portion of the Croton dam, which corresponds with the section of the Dolge- ville dam as regards friction, vertical contraction, siphonage, etc. The flow through the turbines has also been computed since June, 1899, from curr
. Bulletin - New York State Museum. Science. 414 NEW YORK STATE MUSEUM From the date of establishing the station at Dolgeville in 1898 to June 1, 1899, the discharge was computed from a curve derived from Cornell University experiment No. 13. From June, 1899, it has been computed from a revised curve, based on experiments by John R. Freeman on a model of the round-crested portion of the Croton dam, which corresponds with the section of the Dolge- ville dam as regards friction, vertical contraction, siphonage, etc. The flow through the turbines has also been computed since June, 1899, from current-meter measurements in the tailrace, instead of the manufacturers' rating tables, as formerly. The effect of the changes has been to slightly increase the extremes of flow—both as regards high and low water—the flow for the mean stage remaining substantially the same. This dam is prac- tically watertight and no allowance is made for leakage. The headwaters of this stream lie in the horizon of the granites and gneisses. It crosses the Trenton group and the Hudson river shales. Discharge measurements of West Canada creek. Measurements of West Canada creek have been made at Middleville at the timber dam of the Nelson Knitting Company, which supplies power to four mills. Aside from an ice slide, the crest of this dam is nearly level. The leakage of the dam is taken at 50 cubic feet per second, although the leakage is stated to have increased so much during 1901 as to lead to the abandonment of the station. The following cut shows cross-sections and profile of this dam:. El. '//////////A Stone Wall 2 El. y////////;//, Timber Crib f//////////////^^^^^^ Fig. 32 Cross-sections and profile of dam on West Canada creek at Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York State
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
