Conservation design and scenario for flood mitigation on arui watershed, Indonesia

Flooding has been a natural disester in Indonesia and elsewhere. This research is designed to create scenarios and designs conservation to mitigate flooding disaster. Date potential, vulnerability, and duplicated river covering 0.25% of the targeted flooding area were collected and analysed. Five design of conservation, the netural river as control, river normalization, normalization with stone gabion, river straightening, and straightening with gabion stone, and main targeted responses of these five scenarios are river current velocity. Effectiveness scenarios were analysed using Anova and Tukey test. The rasults showed that straightening; with gabion stone was the most effective scenario for flooding mitigation since this was the most effective in increasing river current velocity. This could prevent landslide, accelerate current, overcome flooding, and prevent flooding. Other scenarios such es, normalisation stone gabirn, deadlock alley ditch, canalization, and riparian reclamation are possible implemented. © 2019 by the authors.