Filtration reliability of the channel with concrete lining

Abstract

The article considers the filtration reliability of the Bustan canal with a concrete lining in the southern part of the Republic of Karakalpakstan. The purpose of the reconstruction of the canal is to avoid the pumped irrigation and the high water consumption associated with it, and change to gravity irrigation with increased efficiency through the implementation of reliable waterproofing measures.In addition, to provide irrigation water to command areas of 100 thousand hectares, Ellikal’a, Beruni and Turtkul regions, the canal is constructed in the fill,partially semi-excavation and semi-fill. The canal is located in the sandy areas and,accordingly the embankment is constructed using sandy material with layer-by-layer compaction to achieve a density of 1.66 g/cm3. Concrete class B25 with thickness 12cm, was laid on geotextile and geomembrane 1.5 mm thick. The main objective of the field research of the constructed section was to check water tightness and durability of the work completed.The field investigationswere carried out on two experimental sections of the Bustan canal in 50 m length, from PK47 + 55 to PK 48 + 00 and from PK 266 + 37 to 265 + 87. Here are results of investigation on the first experimental section which were carried out from 12/15/2021 to 12/21/2021 for 7 days. During the seven days, observations were made of leakage along the side embankments, outer slope of the canal embankments, and evaporation from the surface of ponding canal section was also measured. Evaporation of water during this time was3.5 mm/day, i.e., the water level in the experimental section was decreased only due to the loss of evaporation. During the observation period, leakage of water was not observed, which indicates sufficient reliability of water tightness, concrete lining and geomembrane.