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GIS based diagnostic analysis of irrigation system performance assessment of Bhadra command area at disaggregated level Study area The Bhadra Dam is located across Bhadra river near Lakkavalli Village , Chikmagalur district of Karnataka state, at an elevation of 610m above MSL. Bhadra project comprises of a storage reservoir with a capacity of 2025 m3 a left bank canal and a Right Bank canal. The three distributories for the diagnostic analysis having no. 9A, 12 and 15 belonging to Malebennur branch canal of the right bank canal. The Malebennur branch canal is 48km in length and a full supply depth of 2.44m. The full supply discharge is 20.10 cusec and the irrigated area is 23,710 ha. The 9A distributory is in a very good condition with about 80% cement concrete lining. The minors are lined to some portion. The 12 and 15 distributaries are partially lined with about 10 m portion being lined on both sides of the PO. The 15 distributary is in a very poor condition with the entire portion of the channel being weeded and with lot of physical damages to the system. Farmers at the head reaches in all the three distributaries are going only for paddy and those at 15 distributary for crops like sugarcane and other semi-dry crops.  Fig. 5: Analysis on farmers involvement Probable reasons for the contrasting performances of the distribution Three distributaries selected for the study and their performance indicators are listed below in table 1 The following are the 15 probable reasons identified for the contrasting performances of the different distributaries under almost similar climatic and agro_ecological conditions:
To obtain all the important information for the diagnostic analysis, the questionnaire based on the experience gained from the reconnaissance survey is designed for the irrigation officials, agricultural authorities and the farmers soak s to obtain information from the relevant sources. The questionnaire to the irrigation authorities covers questions related to irrigation water management, canal conditions, interaction with the farmers and the agricultural officials. The questionnaire prepared to the agricultural authorities covers questions related to the crops to be grown in the study area, their interaction with the farmers and the irrigation officials, type of agricultural extension and other miscellaneous information regarding the soil fertility conditions in the study area. The questionnaire executed to The farmers covers apart from other information, information related to their identification, the details regarding the inputs and the production in the current season, their involvement in the various NWMP activities, their views about the irrigation and the agricultural authorities, and their knowledge about the various agricultural aspects.
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