This study aimed at some of the criteria used to determine the form of the river basins, and exposed the
need to modify some of its limitations. In which, the generalization of the elongation and roundness ratio
coefficient criterion was modified, which was set in a range between (0-1). This range goes beyond
determining the form of the basin, which gives it an elongated or rounded feature, and the ratio has been
modified by making it more detailed and accurate in giving the basin a specific form, not only a general
characteristic. So, we reached a standard for each of the basins' forms regarding the results of the
elongation and circularity ratios. Thus, circular is (1-0.8), and square is (between 0.8-0.6), the blade or oval
form is (0.6-0
...
Show More