_____________________________________________________________________________________________________ ++ Assistant Professor & Ph.D Scholar; # Professor; *Corresponding author: E-mail: priya.nair@kau.in; Int. J. Environ. Clim. Change, vol. 13, no. 8, pp. 182-196, 2023 International Journal of Environment and Climate Change Volume 13, Issue 8, Page 182-196, 2023; Article no.IJECC.100299 ISSN: 2581-8627 (Past name: British Journal of Environment & Climate Change, Past ISSN: 2231–4784) Creation of Geospatial Database and Estimation of Irrigation Water Requirement of a Canal Command in Gayathri Irrigation Project, Kerala Priya G. Nair a++* and Asha Joseph b# a Krishi Vigyan Kendra, Tavanur, Malappuram, Kerala Agricultural University, India. b Department of Irrigation and Drainage Engineering, KCAET, Tavanur, Malappuram, Kerala Agricultural University, India. Authors’ contributions This work was carried out in collaboration between both authors. Both authors read and approved the final manuscript. Article Information DOI: 10.9734/IJECC/2023/v13i81943 Open Peer Review History: This journal follows the Advanced Open Peer Review policy. Identity of the Reviewers, Editor(s) and additional Reviewers, peer review comments, different versions of the manuscript, comments of the editors, etc are available here: https://www.sdiarticle5.com/review-history/100299 Received: 15/03/2023 Accepted: 18/05/2023 Published: 22/05/2023 ABSTRACT The water requirement of crops in the canal command of distributaries of Gayathri Irrigation Project in Palakkad district, Kerala was estimated using GIS and CROPWAT 8 model. The geospatial data base for canal network, land use, soil and climate were prepared using Geographic Information System (GIS) tools. This data base was used as input to CROPWAT model to estimate irrigation water requirement of different distributaries of the canal command. The gross irrigation requirement was estimated for the historical climate data (2004-2018) as well as the predicted climate data for the years 2026 and 2031. The net irrigation water requirement of different crops in the distributary command was found to vary spatially depending on soil, crop and climate. The net irrigation water requirement of paddy (mundakan) in distributaries located at head to tail reaches varied from Original Research Article