Author(s): Haryo Istianto; Ronny Bernard; F.X. Suryadi
Linked Author(s):
Keywords: Flood; Drought; Tidal irrigation; Pump; Flap gate
Abstract: High population growth that is not coupled with appropriate food production improvement affects food security in Indonesia. One of the Government's efforts is to increase staple food/rice production. One way that can be done is to develop irrigation on lowland which is currently only developed 5.3% of total area of lowland in Indonesia. The Province of South Sumatra as one of the top five rice-producing provinces in Indonesia also has an extensive lowland area, one of which is Gandus lowland. However, the problem of floods and drought that often hit Gandus lowland area greatly affects rice production in the Gandus irrigation unit. Water management at Gandus lowland is expected to overcome the problems of floods and drought. The water management analysis is based on existing infrastructure and the possibility of additional infrastructure which is needed to improve rice production. To analyze the water management of the current situation and other possibilities, this research develops a model which is analyzed using DUFLOW software. This research is based on three scenarios which are, scenario 1: the existing water management, scenario 2: the usage of flap gate, and scenario 3: the use of pump and retention basin. From the modeling results, the first scenario cannot solve the problem of flood and drought, the water level is higher than the crop requirement in most of the time. The second scenario can overcome the flood problem but there is a possibility of 4 days submerging condition that can affect rice yield, furthermore in this scenario, the drought problem cannot be overcome. The third scenario can increase rice production at Gandus irrigation unit; furthermore, for the efficient use of the pump, the retention basin is needed. This retention basin can be used as storage in the dry season. The relation between pump capacity requirement, average pump discharge, and retention basin area are presented as an option to overcome floods and droughts to increase rice production.
Year: 2018