North Bihar Kosi-Gandak Floodplain

Summary

This dependency zone explains why the Kosi and Gandak routes cannot be read as simple blue lines. They pass into one of the most sensitive floodplain and agricultural geographies in the downstream story.

Simple Explanation

The zone marks the downstream plain where Nepal-linked rivers meet dense settlement, agriculture, embankment systems, and flood memory. It is there to show exposure context, not to model flood depths or assign control.

Why It Matters

North Bihar is central to the geopolitics map because dense settlement, agriculture, sediment, embankments, and flood memory sit directly downstream of Nepal-linked river systems.

How To Read The Zone

Read it with Kosi-Ganges Merge and Gandak-Ganges Merge. The zone explains exposure; the merge markers explain route handoff.

Caveat

This is not a hydrodynamic or flood-risk model. It does not say Nepal controls North Bihar water outcomes. It says Nepal-linked routes pass through a high-sensitivity downstream geography.

Common Misunderstandings

This is not a flood-inundation map. It marks strategic exposure, not modeled water depth or return periods.
It is not a claim that Nepal controls North Bihar outcomes. The layer shows route dependency within a shared river system.
It should not be read without the merge markers. The floodplain zone explains exposure; Kosi-Ganges Merge and Gandak-Ganges Merge explain route handoff.