Assesment of selected empirical formulas for computation of saturated hydraulic conductivity

This paper deals with the comparison of empirical formulas used for computation of saturated hydraulic conductivity values Kd. The disturbed samples of bed silts were obtained from the Komárňanský channel at the Žitný ostrov (ŽO), Slovakia. The bed silts were extracted from three different vertical parts of silt top, middle and bottom part of silt layer in each selected cross-section profile of the Komárňanský channel. Because the samples are disturbed only the empirical formulas based on the grain size analyses were used. The measurements of silting and the extraction of bed silt samples were carried out in 2019. These measurements were used for calculation of saturated hydraulic conductivity values Kd. In the previous study we calculated the values of saturated hydraulic conductivity for disturbed samples Kd according to Bayer – Schweiger; Špaček I and Špaček II empirical formulas. In this current paper we used other empirical formulas based on the grain size analyses. We selected Hazen I.; Bayer; USBR and Orechova formulas which were in the past used in the software Geofil. These valid values Kd reached from 2.00 x10 to 9.07 x 10 m s. We used the number of valid computed results (count) of Kd to determine the formula ́s ability to give results meeting the validity requirements. The recommended formula for calculation of Kd of bed silts in Komárňanský channel based on this criterium is Hazen I., which range is 1.16 x 10 to 7.25 x 10 m s.