AVERAGE MONTHLY RUN OFF IN INCHES DEPTH ON DRAINAGE AREA OF HUDSON RIVER AT MECHANIC VILLE, FOR YEARS 1888-1907, INCLUSIVE. Arranged in order of dryness. (Corrected for Canal Diversion, May to November, Inclusive.) Catchment area = 4,500 square miles. Average 20 years. AVERAGE MONTHLY RUN OFF OF HUDSON RIVER AT MECHANICVILLE, 1888-1907- (Concluded). 0.662 0.91 July 1.00 0.824 1.49 Aug. 0.94 Feb. 1.02 1.059 POWER FROM SACANDAGA STORAGE, FIRST STAGE. Increased Power at Present Hudson Plants if Sacandaga Reservoir be Used Solely for Benefit of Hudson River. The mass curves show that at least twenty-two inches depth per year on watershed could have been drawn in the dryest period. Twenty-two inches stored and released (=1.833 feet) is equivalent on 1,050, 1,050 x 5,280 x 5,280 x 1.833 feet square miles of watershed to one inch run off from 1,050 square miles (Sacandaga) per month on 3,450 square miles of drainage above Mechanicville exclusive of Sacandaga SACANDAGA STORAGE, FIRST STAGE OF DEVELOPMENT = 1,703 c. f. s. =927 c. f. s. = 3,047 c. f. s. COMPUTATION OF POWER DERIVED FROM THE STORED WATER, PER FOOT OF FALL. Inches Depth of Runoff FOR 20 YEARS 1888-1907. Months Arranged in Order of Dryness. 1.0 inch of runoff per month equals a 24 hour 7day flow of 12 x 30.44 x 86400 mile Months in order of Dryness. 1.0 inch of runoff per month will give of 24 hour 7 day power 0.885 x 62.4 x 1.0 x 80% = .0802 net horse power per foot fall per sq. mile 550 = 80.2 1000 sq.m John R. Freeman, |