Desert

Desert

DETERMINING OF REGIONAL COEFFICIENTS OF FULLER'S EMPIRICAL FORMULA TO ESTIMATE MAXIMUM INSTANTANEOUS DISCHARGES IN DASHT KAVIR BASIN, KALSHOUR SABZEVAR, IRAN

Authors
A. Salajegheh 1
J Dastorani 2
1 Assistant Professor, faculty of Natural resources, University of Tehran
2 Senior expert of watershed Management
10.22059/jdesert.2006.31867
Abstract
Estimation of the magnitude and frequency of maximum instantaneous discharges and hydrographs
are used for a variety of purposes, such as the design of bridges, culverts, flood-control structures; and the
management and regulation of floodplains. Fuller (1914), developed a flood-frequency formula based on
analysis of flood peaks in hundred of streams to provide simple methods of estimating maximum instantaneous
discharges, and sought to link maximum instantaneous discharges having various average return periods to
the mean of the maximum annual discharges with a factor calibrated for different catchments. The aim of this
study is the evaluation of the mentioned method in order to estimate maximum instantaneous discharge and
calibrating its considered coefficients in Kaal Shour Sabzevar region. Therefore, the collected data from 10
hydrometric stations in the region were used in analysis and regional coefficient was obtained 0.041 and
regional inundation coefficient is from 0.88 to 2.23 in 5 to 200-year return periods. The results showed that the
discharge calculated by Fuller’s empirical formula is less than values calculated by statistical distributions.