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The increased risk of flooding in terms of magnitude and frequency in urban areas encourages people to act for flood mitigation measures. The method used is research and development. The stages of the research stage came from the simple WSN used and modifications in this study were (1) the assembly of ultrasonic sensor components for characterization and calibration of the ultrasonic sensor (2) analysing the accuracy of the ultrasonic sensor and if the water level in STANDBY3, STANDBY2, and STANDBY1 conditions would provide notification in the form of SMS. The results of the research that has been carried out concluded that the static testing of PING ultrasonic sensors has an average error of 2.167% and an accuracy value of 97.833%. testing of ultrasonic sensors ping dynamically has an average error of 1.97% with an accuracy of 98.03%. Static notification testing reaches 100% success rate.

Wireless Sensor Network (WSN) application for Monitoring the River Water Level