Though the river capture is a natural process, but it does not take place in all circumstances rather it requires certain necessary conditions. It is called misfit because of the fact that the former valley of the captured stream becomes too large and wide for the beheaded stream because of substantial decrease in the volume of water due to diversion of its water to the captor stream. The misfit or under-fit stream is the lower course of the captured stream. Wind gap is the dry portion of the beheaded stream just below the elbow of capture (fig.
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