APPRAISAL OF VARIABILITY IN IRRIGATION WATER USAGE UNDER SELECTED DISTRIBUTARIES OF TUNGABHADRA PROJECT COMMAND AREA
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Date
2013-01-30
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UNIVERSITY OF AGRICULTURAL SCIENCES RAICHUR – 584 102
Abstract
There is need to assess the water use efficiency at different locations from the reservoir as centre under major irrigation project including Tungabhadra project. The study was undertaken in six watercourses located in upper middle and tail reaches of 38th and 99th distributaries in Tungabhadra left bank canal command area. The estimated ETo for all the reaches of 38th distributary with increases of 77.11 mm from Kharif to Rabi season and 99th distributary would receive water only during Kharif season prevailed with ETo of 508.74 mm throughout the distributary. The crop water requirement (555.85 mm) increases to 112.64 mm from Kharif to Rabi season for all the reaches of 38th distributary. In case of 99th distributary crop water requirement was estimated to be (573.37 mm). Irrigation water availability is maximum in upper and middle reach and minimum in tail reach under 38th distributary during Kharif season and in case of Rabi season irrigation water availability in middle and tail reach is minimum and maximum in case of upper reach. In case of 99th distributary irrigation water availability is maximum in upper reach and minimum in middle and tail reach. Gross crop water requirement was maximum in tail reach (1385.40 mm) and minimum in middle (1075.16 mm) and upper reach
(1173.46 mm). During Rabi season, gross crop water requirement was maximum in tail (1881.92 mm) and middle reach (1437.36 mm) and was minimum in upper reach
(1303.93 mm) under 38th distributary. In case of 99th distributary gross crop water requirement was maximum at tail (1085.24 mm) and upper reach (968.79 mm) and was minimum in middle reach (926.99 mm).
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