Abstract
The aim of this study is to evaluate the technical condition of selected hydrotechnical structures in Southern Poland, based on data collected from periodic inspections and diagnostic testing conducted between 2018 and 2023. The analyzed structures, primarily built in the 1960s–1980s, include culverts, weirs, locks, spillways, and embankments. Most have been in operation for over 60 years and are classified as importance class I or II. The methodology involved a review of inspection protocols and test results, including non-destructive and destructive tests such as Schmidt hammer testing, core specimens with compressive strength analysis, ultrasonic testing, water permeability, frost resistance, and water chemical aggressiveness. Each structure was assessed using a pointwise and verbal rating system. Key findings indicate widespread surface erosion, carbonation, and cracking of concrete elements. Although all structures operate in similar aquatic conditions, testing procedures varied significantly, revealing a lack of a standardized diagnostic approach. Inconsistent data makes comparison difficult and limits the effectiveness of material condition assessment. The study concludes that a unified diagnostic framework is urgently needed to ensure consistent evaluation of aging hydrotechnical infrastructure. It should include standardized test sets, interpretation criteria, and frequency guidelines. Regular, uniform diagnostics are essential for developing effective maintenance and repair strategies, ensuring structural safety and service continuity.