GENERAL GEOLOGY

Detailed explanation-1: -Bifurcation ratio (Rb) Bifurcation ratio is the ratio of a number of the stream segments of specified order and a number of streams in the next higher order [1–6]. The Rb is dimensionless property [1]. Basically, there are two classes of Rb value; low and high.

Detailed explanation-2: -The bifurcation ratio varies between 2 in flat and rolling surface to 4 or 5 in mountainous or highly dissected drainage basins. Minimum bifurcation ratio indicates that the basin is more flat or rolling drainage basins. The study watershed is highly susceptible to flooding due to high bifurcation ratio.

Detailed explanation-3: -As the stream order increases in a drainage basin, number of streams decreases significantly.

Detailed explanation-4: -(a) Horton orders : Horton (1945) originally developed the notion of stream orders. First-order streams are those which have no tributaries, second-order streams are those which receive as tributaries only streams of the first order, etc.

Detailed explanation-5: -The bifurcation ratio of an overall hierarchy may be taken by averaging the bifurcation ratios at different orders. In a complete binary tree, the bifurcation ratio will be 2, while other trees will have larger bifurcation ratios. It is a dimensionless number.