Irrigation Practice and its Effects on Water Storage and Groundwater Fluctuation in the First Dry Season in the Rice Cultivation Region, South Sulawesi, Indonesia

Irrigation in RenggangWater Users’ Association region in the first dry season, 2012 and 2013 was characterized by the reused water irrigation of drainage and the groundwater irrigation from wells. The shortage of the canal irrigation in 2012 was improved mainly by the renovation of the secondary canal by farmers’ “gotongroyong”. The fluctuation of groundwater level was highly correspondedbythe timely change of stored water in the ground (ΔS).The positive ΔScaused by the gross water supply in the first half period of the rice cultivation, was evaluated to keep the groundwater at some level.