Author : Sanjit Kumar Bhattarai 1
Date of Publication :11th May 2021
Abstract: Bhutan being a mountainous country, the possibility of constructing an efficient irrigation system is less and most of the places do not have sufficient water for the cultivation of crops. There is limited research done to design the irrigation canal as many irrigation systems across the country has failed. The limitation can be covered with Geo-technical approach in designing the irrigation system. Richey village under Dewathang gewog, Samdrup Jongkhar was identified to have irrigation water shortage for planting the main crops i.e. rice and maize. Crop water requirement was determined with the application of CROPWAT. Maps were created using ArcGIS 10.4.1. Stream and contour map were used to locate the sources, three locations were identified namely Marthang, Lamsarong and the water harvest area. The alignment of the canal was produced using contour and slope maps and then compared where the water harvest area was found to be most suitable area as source for the study area. The calculated water amount for harvesting was 4,827,259.32m3. Finally, the irrigation canal was designed from the discharge and slope obtained from the CROPWAT 8.0 and ArcGIS respectively as per the standards of IS 4745-1968.
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