Rehabilitation and Development of Irrigation System in Lokoliku Village, West Nusa Tenggara

Water is an important requirement in agricultural activities, especially in rice farming. The effectiveness and efficiency of water distribution greatly determine the success in agricultural activities and indirectly affect the food security in an area. This study aims to develop an irrigation network in Lokoliku Village, South Wewewa District, West Sumba Regency, East Nusa Tenggara. The data included the map of irrigation area, rainfall data, the schematic irrigation channel, and the characteristic data consisting of rain potential, land area, land conditions, and crop types. The hydrological analysis consisted of irrigation water requirements, reliable discharge, water balance, and the irrigation flow system. Based on the results, it is determined that the water demand was 1.4 m3/sec/Ha. The water discharge channeled from the intake based on the requirement in an area was 121.64 Ha is 170,296 m3/sec. In addition, the planned dimensions of the new channel are trapezium-shaped channels with a width of 0.30m (base), a width of 0.90m, a wet channel height of 0.14m, and a embankment height of 0.20m. The results of this study can be used as recommendations for the stakeholders, such as the local agriculture department, the irrigation department or other agencies for developing the irrigation system