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Abstract


Variation of Monthly Flows of Kelkit Stream
The main purpose of this study was to determine the variations of monthly flows of Kelkit stream located in Yeşilırmak watershed for 25%, 50% and 75% exceeding probability levels obtained from probability distribution. In determining variations of Kelkit stream monthly flow values, was used flow values measured from 1938 to 1995 in numbered 1401 flow station founded by General Directorate of Electric Power Research Survey and Development Administration (EIE). Frequency lines of monthly flows observed in these flow station have been determined according to Normal, Logarithmic Normal, Extreme Value Type I, Pearson Type III and Logarithmic Pearson Type III probability distributions. The frequency lines of mentioned distributions was obtained from frequency factor relationship. Monthly flows of Kelkit stream have fitted better to Extreme Value Type I for 5., 8., 9., 10., 11. months, Pearson Type III for 12. month, Logarithmic Pearson Type III for 2. month and Logarithmic Normal probability distribution for other months. The flow amounts correspondent at 25%, 50% and 75% exceeding probability levels have been taken from the distribution graphs and then the duration curve of monthly flows were drawn by using these values.

Keywords
Monthly flow frequency factor probability distribution duration curve


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