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I I I I I I I I I I I I I I I I I I I an amount of 0.42 times the standard deviation from the mean annual flow, Years were classified as years of high streamflow if the annual flow was greater than the mean average flow by an amount of 0.42 times the standard deviation from the mean annual flow. Years were classified as years of normal flow if the annual flow was between the limits established for years of low and high flows, Based on this method of classification, 18 of the 44 years from 1941 through 1984 were years of low flow; 12 of the 44 years were years of normal flow; and 14 were years of high flow, The method of classification was based on the assumption that annual flows follow a normal distribution and on the average there are one third of years classified as low streamflow years, normal flow years and high flow years, According to normal distribution, one third of all events would be smaller than the mean minus 0.42 times the standard deviation and one third of all events would be larger than the mean plus 0,42 times the standard deviation, Section 2: Water Supply: Stream flows The hydrological analyses summarized in this chapter were concerned with the water resources in three basins: A, Tongue Creek and its major tributary, Surface Creek, and five smaller tributaries: Dirty George, Ward, Kiser, Cottonwood and Youngs Creeks, B. Leroux Creek and its major tributary, Cow Creek. C. The Overland Ditch and Reservoir System, which consists of Cow Creek, a tributary of Muddy Creek, upstream from the Overland Reservoir and Terror and Hubbard Creeks, upstream from where they are intercepted by Overland Ditch. Overland Reservoir, Terror Creek and Hubbard Creek all contribute water to Overland Ditch. The water supply of Tongue Creek basin was of basic importance because the purpose of the study was to formulate plans to improve irrigation and alleviate shortages of water within the basin, The two additional basins are of interest, as III-2