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An early warning system is a preventive measure that minimizes the risk of many victims falling during a natural disaster. This system provides information on flood hazards based on observations of flood water level heights which are then forwarded via web media or social media (text messages), so that the public can anticipate early. The research aims to analyze the characteristics of flooding in the Tallo River Basin and determine the early warning system point. This research was carried out by collecting primary data including visual observations, namely looking at the physical condition of the Tallo River as well as flood control buildings around the river and measuring discharge using a current meter as data validation. This research method begins with secondary data collection and primary data collection. Next, a field survey was carried out to obtain the location of the flood incident and the destructive effect of water. Next, data analysis was carried out to determine real-time inundation height prediction modeling based on existing rainfall data, thereby producing good predictions for areas frequently hit by floods in the Tallo River basin. [ABSTRACT FROM AUTHOR]

Many parts of the national road of Salubatu – Mambi cross along hilly areas with quite tall and steep roadside slopes. Such these slopes usually have difficulties and insufficient areas to be cut and filled on the roadside for slope stabilization purposes. Soil nailing is a technique of the slope reinforcement suitable for this typical site. This research aimed to design soil nailing for the roadside slope reinforcement. In order to achieve the research objective, topographic survey and soil investigation were performed on the site. Numerical analysis using the PLAXIS Software was carried out based on data obtained from the site investigation to figure out tensile strength of the soil nailing for resisting the slope from failure. The research resulted in nail bar, as a main part of the soil nailing, 25 mm in diameter and 7 m in length with 1.5 m and 1.2 m in vertical and horizontal spaces respectively. The use of soil nailing increased safety factor in slope stability from 1.034 (fail) for existing roadside slope to 1.970 (safe) for the roadside slope with soil nailing reinforcement. [ABSTRACT FROM AUTHOR]