Soil filtration coefficient assessment of the irrigation canal base

Abstract

Purpose: quantitative assessment of the filtration coefficient of coherent soils of the existing irrigation canal base. Materials and methods. The initial materials for the research were pre-design, operational and other technical documentation on the Chernozemelskaya environmental protection system, as well as field survey data of the system technical condition in the Yashkul district of Kalmykia. When performing measurements, the following equipment was used: a measuring container, metal rulers, a digital thermometer with a needle probe, a two-ring infiltrometer, a time clock. Results. The value of the filtration coefficient (at steady flow) varied within 0.24–0.27 m/day (or 0.17–0.19 mm/min). The average value for the filtration coefficient according to field measurements was 0.18 mm/min, which corresponds to 0.255 m/day. According to the N. A. Kachinsky classification, the soils of the studied area are characterized as medium loamy (with a predominance of sand fraction). The range of values of the filtration coefficient for these soils is from 0.005 to 0.4 m/day. According to the calculation results, the filtration coefficient was 0.238 m/day or 0.165 mm/min. Conclusions. Comparison of the calculated and experimental values shows that the calculated filtration coefficient coincides with the experimental one (obtained in the field) well. The discrepancy between the values was 7.1 %. Nevertheless, the estimated estimation of the filtration coefficient according to empirical dependencies is approximate, therefore, in further filtration calculations of the bulk section of the Yashkul distribution canal, data from field measurements of the soil filtration coefficient of the channel base under consideration will be taken into account.

Keywords

• irrigation canal
• filtration coefficient
• water permeability
• infiltrometer
• filtration
• efficiency