Sources of hydrological flows into wetlands are predominantly precipitation, surface water, and groundwater. Class-2-warnings were issued by the Swedish Meteorological and Hydrological Institute. The primary coupling between groundwater and hydrological inputs is the unsaturated zone or vadose zone. Water levels fluctuate due to the karst hydrological drought in the Prokletije. HMP has conducted geological, hydrological, botanical, and microbiological studies in this harsh environment since 1997. The Peninsula's river catchments are noted for their exceptional hydrological integrity. It is commonly used to quantify topographic control on hydrological processes. NEXRAD data also provides information about rainfall rate and aids in hydrological forecasting. The TWI has been used to study spatial scale effects on hydrological processes. Jiuzhaigou's landscape is made up of high-altitude karsts shaped by glacial, hydrological and tectonic activity. A different type of drought is the hydrological or agricultural drought. One of the main uses of hydrological modeling is in environmental contamination research. Rivers are part of the hydrological cycle. Agricultural practices can also be streamlined to higher levels of hydrological efficiency. They began monitoring hydrological conditions and lake levels in 1918.