Editing River discharge at basin outlet (section)

== Monitoring and Measurement ==
River discharge at basin outlets is primarily monitored through national hydrometric networks employing gauging stations strategically located at or near basin outlets. These stations measure water stage (height) and use established rating curves to convert stage data into discharge values. Measurements are typically continuous or periodic, providing time series data essential for hydrological analysis.

Monitoring institutions vary by country but often include government agencies responsible for water resources, such as the United States Geological Survey ([https://en.wikipedia.org/wiki/United_States_Geological_Survey USGS]) or equivalent national bodies. Advances in remote sensing and hydrological modeling complement in situ measurements, enhancing spatial and temporal coverage. Standardized measurement protocols ensure data comparability across regions and time.

Within the SIGNAL system, river discharge at basin outlet is treated as a defined environmental signal whose boundaries and measurement conventions are described below.