Different aspects of shallow seismic methodology features in order to evaluate the condition of a protective dam and for an upgrade of the drainage system of the Plavinas HEPS on the Daugava River are considered. Within the framework of unified field technique, data was obtained for investigating soils, morainic deposits and buried karst manifestations on the bedrock surface in the foundations of hydraulic engineering structures using different kinds of seismic waves. Based on the obtained data, optimal locations of hydrogeological and testing boreholes were determined at the probable sites of increased filtration zones within the regional confined groundwater horizon.


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