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Based on the differences in channel pattern for the northern plains of Bihar,
distinct morphological areas can be identified. A dendritic channel pattern with
high angles of tributary convergence is typical of the erosional terrain of the
high mountains and foothills, north of the Himalaya front. On the alluvial
plains, the Gandak and Kosi megafans can be distinguished by their divergent
channel patterns and the subtle positive topography shown by the contours. The
Ganga defines a main zone of axial flow. The interfan area between the Gandak
and Kosi megafans divided into amn ‘upstream interfan area’ of gently converging
rivers that flow, on average, perpendicular to the mountain front, and a
‘downstream interfan area’ where the more sinuous channels of the Burhi Gandak,
Baghmati and Kamla-Balan systems flow generally south-eastwards.
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Data based on World Topographical Series HIND 5000
DEM (grid spacing of 30 arc seconds) from
GTOPO30
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