Analysis of flow duration curves showed that reforestation of a 44-acre watershed near Coshocton, Ohio, reduced flow in the low flow tail of the curve but did not significantly reduce flows above 0.25 inch per day. Other analyses showed that reductions also. occurred in the maximum annual flow volumes for all periods of flow durations of I day or longer. The onset of dormant season flow was significantly delayed. Data from a 43.6-acre watershed at the North Appalachian Experimental Watershed have been the subject of several analyses during the past decade. About 70% of this watershed was reforested to pines in 1938 and 1939, whereas the remainder was left in uneven age hardwoods. The latest analysis [Ricca et al., 1970] con-ß ß ß ß ß REFORESTED ! o o o Oß ß o ß ß o 000 ß ß ß O0 ß ß 0 ß ß ß 0 CLIMATIC INDEX • oO oo ß 0-0 -ß • ß ß ß O• ß •-O0 q• ß _ ß REFORESTED (ADJUSTED) 1542-A, 1959. Tennessee Valley Authority, Division of WaterControl Planning, Hydraulics Data Branch, A brief history of watershed research in TVA, 2'9 pp.,

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Corn grown on plasticcovered monolith lysimeters at Coshocton showed that a very good crop was produced using only the water stored in the soil. A yield of 125 bush els per acre was obtained by using only 8.5 inches of

Evaluation of soil moisture changes with the neutron method agreed closely with that obtained from the weighing lysimeters. Evapotranspiration can be determined with either method by the equation ET = P ‐ G ‐ Q ± Δ M where ET = evapotranspiration, P = precipitation, G = percolation, Q = surface runoff and ΔM = change in soil moisture. Differences were shown in the soil moisture extraction pattern under deep‐rooted and shallow‐rooted meadow crops. The hydrologic implications of this difference are discussed.

In recent years the Water Resources Branch of the United States Geological Surrey has given considerable attention to the relation of ground‐water to stream‐flow. One locality in which this relation is being studied is about 13 miles from Washington, near Colesvllle, Maryland, where a Kinnison float‐gage is being maintained in a well In connection with the operation of a gaging‐station on the Northwest Branch of the Anacostia River. The well is opposite the gaging‐station, on a gentle slope about one. fifth of a mile from the stream, where the land‐surface ia about 20 feet above the bed of the stream. The well is an abandoned dug well 20 feet deep and is lined with loose stone and presumably admits water freely. The fluctuations of the water‐level in the well are believed to afford a fairly close index of fluctuations in the water‐table at the well‐site and may be typical of the fluctuations that occur in a large part of the area drained by the Northwest Branch above the gaging‐station, consisting of about 21 square miles of gently rolling farm‐land. During the period of the observations herein considered the water‐level in the well ranged from 10 to 16 feet below the ground‐surface at the well and from 10 to 4 feet above the bed of the stream.