Efforts were made to select the channels to represent various geographical locations, different lining materials, old and new lining, and other factors as enlisted above. Based on these attributes, 14 channels were selected for the study of the impact assessment of lining on the hydraulic efficiency of irrigation channels. A number of channels selected in different zones under different categories of discharge is given in Table 1. About 5% sample of the total population of lined channels was selected for the study. Preference was given to small channels as the same was the criteria for the identification of channels for lining. The salient features of selected channels for the study are given in Table 2. Irrigation zones wise percentage of selected channels is shown in Figure 2. The location of selected channels in all irrigation zones are shown in Figure 3. Different steps taken to accomplish this research study are shown in Figure 4.