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The bifurcation ration is the relationship between the number of steams of one order an those of the next highest order. It is calculated by dividing the number of streams in one order by the number in the next order. For example , in a basin :
N1/N2 = (number of the first order streams / number of second order streams) = 20/4 = 5
N2/N3 = (number of the second order streams / number of third order streams) = 4/2 = 2
N3/N4 = (number of the third order streams / number of fourth order streams) = 2/1 = 2
then, by finding the mean of each rations in the basin being studied :
(5 + 2 + 2)/3 = 3 = bifurcation ration for this basin.
*** the significance of this ratio is that as the ration is reduced so the risk of flooding within the basin increases. it also indicates the flood risk for parts of the basin.
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