Which one of the following observations regarding rivers is not made by the Central Water Commission operating through its network of hydro-meteorological stations?

The Central Water Commission (CWC), under the Ministry of Jal Shakti, operates a vast network of Hydrological Observation (HO) stations across various river basins in India. These stations are designed to collect data on specific hydrological parameters at fixed points. The primary observations made by this network include:

• Water Level (Gauge): Monitoring the elevation of the water surface.
• Discharge: Measuring the volume of water flowing through the river section.
• Silt (Sediment): Analyzing the suspended sediment load.
• Water Quality: Monitoring chemical and physical properties of the water.

Shifting in river channel (river migration or morphological changes) is not a parameter measured directly by these hydro-meteorological stations. Such changes are typically studied using Remote Sensing (satellite imagery), Geographic Information Systems (GIS), and historical map comparisons to track the lateral movement of river banks over time.