History of hydrological monitoring in Varaždin

Hydrological monitoring involves the systematic observation and recording of key hydrological parameters, such as water level, flow rate, precipitation, sediment transport, water temperature, and ice conditions, to understand changes in watercourses and river regimes. These observations are conducted at hydrological stations located on rivers, lakes, or reservoirs, providing valuable data for water resource management. The origins of hydrological monitoring in Croatia date back to the first half of the 19th century when the first water gauge stations were established. One of the oldest stations, the hydrological station in Varaždin, was founded in 1821. At that time, the main observations focused on recording river water levels to ensure navigability, monitor floods, and enable flood protection. Over time, hydrological monitoring in Croatia became increasingly sophisticated. With the establishment of national institutions such as the Croatian Meteorological and Hydrological Service (DHMZ) in 1947, data on water levels, flow rates, sediment transport, precipitation, and other hydrological parameters began to be systematically collected, processed, and published. Today, monitoring is carried out through a network of automatic hydrological stations, enabling continuous real-time data tracking and analysis.