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The basin relief is the difference in height between the highest and lowest points in the basin and Lb is the horizontal distance along the longest dimension of the basin parallel to the main stream line and it s ratio is known as relief ratio Rh The relief ratio is minimum for WS 11 22 0 07 and maximum for WS 3 19 0 17 The Rh normally increases with decreasing drainage area and size of sub watersheds of a given drainage basin Gottschalk 1964 Langbein 1947 observed the significance of drainage density for runoff and suggested that the Dd varying from 0 55 to 1 26 km km2 for humid region with 1 03 km km2 average drainage density In this study the Dd varies from 0 95 WS 22 to 1 72 Ws 4 with 1 26 km km2 average Dd it means the area comes under humid region Form factor varies from 0 21 WS 23 to 0 93 WS 21 Smaller the value of form factor more elongated will be the watershed The value greater than 1 shows the width of the basin and is higher than its length Samal et al 2015 The shape of a watershed influences the shape of its characteristic hydrograph For example a long shape watershed generates for the same rainfall a lower outlet flow as the concentration time is higher
