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From May 1956 to May 1962, Hocking e River subwatershed 1 of Upper Hocking River Pilot Watershed had an average annual sediment yield from its contributing area of 0.94 square mile of 1,195 tons per square mile. Annual suspended-sediment yield at the outlet, expressed in tons per acrefoot of outflow, decreased from 0.45 in the 1957 water year to 0.10 in the 1962 water year, reflecting a decrease in sediment yield from the 1.04-squaremile drainage area above detention structure 1. The particle-size distribution of the sediment entering reservoir 1 averaged 4 percent sand, 38 percent silt, and 58 percent clay, whereas the particle-size distribution of sediment discharged from the reservoir averaged 1 percent sand, 12 percent silt, and 87 percent clay. The specific dry weight of the sediment deposited in the reservoir averaged 71.6 pounds per cubic foot. Trap efficiency of reservoir 1 was about 88 percent for the 6.08-year period of the study. Average annual runoff from subwatershed 1 was 9.5 inches. Comparable runoff for the entire Hunters Run watershed, as measured at Hunters Run at Lancaster, was 11.84 inches during the study period. Average annual inflow to reservoir 1 was 9.2 inches. Outflow from reservoir 1 occurred during 41 percent of the period of investigation. About 91 percent of the annual water discharge and about 94 percent of the annual sediment discharge occurred during the 7-month period, January through July. Chemical-quality analyses of the inflow showed a general range in concentration of calcium from 10 to 70 milligrams per liter and of sodium from 1 to 5 milligrams per liter, and a range in specific conductance from about 140 to 520 micromhos. The ratio of calcium to sodium was 11 to 1, suggesting that flocculation of primary clay particles may have been occurring in the reservoir. However, the available data were insufficient to predict the extent of such flocculation. INTRODUCTION In May 1956 the U.S. Geological Survey, in cooperation with the U.S. Soil Conservation Service, began an investigation of fluvial sediment in Hocking River subwatershed 1 (North Branch

Fluvial sediment in Hocking River subwatershed 1 (North Branch Hunters Run), Ohio