Hydrogeological conditions and water inflow forecast assessment of the South-Eastern outskirts of the Almetyevsk city in the Tatarstan Republic

The article presents the results of the study of geological and hydrogeological The article presents the results of the study of geological and hydrogeological conditions of the south-eastern outskirts of Almetyevsk, Republic of Tatarstan, confined to the III floodplain terrace of the Stepnoy Zay River valley. The main objective is to establish the causes of flooding of the territory and assess the hydrogeological conditions of the studied area, to make design decisions on engineering protection of the territory from flooding and underflooding. It was established that flooding of the territory occurs due to the inflow of water from water-saturated sandy loam, the formation of local pressure and vertical flows, as well as infiltration of atmospheric precipitation. Zoning of the territory was carried out and areas with moderate and slight flooding were identified. As a result of forecast expert calculations, it was possible to establish that the possible maximum increase in the groundwater level will be no more than 12 cm. The maximum possible rise in the groundwater level in the study area would be in its northwestern part reaching 129.42 m, with the depth of the level at 1.00 m, and the pressure value at 2.1 m. The minimum position of the groundwater level in the winter low-water period in the study area would not be below the absolute mark of 125 m, the depth of occurrence is ≈ 5.5 m. The calculation of the volume of water inflow within the study site showed that during the flood the water inflow would be about 5.0 m 3 / day, and during the low-water period – about 3.6 m 3 / day. The obtained results are of great practical importance for the development of measures for engineering protection of the territory from flooding in accordance with current regulatory and legal acts, design of water drainage systems, design of water drainage systems, rational use of groundwater, and planning of construction activities.