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Rives is a source for human and all creatures inside. Water quality of a river will give impact to all creatures surrounded it. Nowadays, there are so many rivers have been exposed to pollution. Pollution came from industrial waste or garbage. Besides causing pollution, waste that has accumulated in the river can cause some problems. Such as flooding in the rainy season caused by so many pollutions inside. Therefore a river monitoring system is needed that can be used to monitor the height and quality of river water. The river monitoring system with multi-hop communication it can be solved to reach more distance. While to make monitoring easier it can be used real-time monitoring. Sending data with low packet loss would give data results better. The value of packet loss can be determined by the delivery interval of time and distance. Packet loss testing is done with variations in the interval of sending 500 ms, 750 ms, 1000 ms, 2000 ms, and 3000 ms. While variations in the distance used are 10 meters, 50 meters, 100 meters, and 300 meters. The best packet loss results at 500 ms sending interval are 48.9% when the distance between nodes is 10 meters. when the sending interval of 750 ms is 25.2% with the difference between nodes 10 meters, when the sending interval of 1000 ms is 1% when the position between nodes is 10 meters, when the 2000 ms sending interval is 3.2% while the distance between nodes is 10 meters, while the sending interval of 3000 ms is 1.9% with the distance between nodes 10 meters. So it can be concluded that the best packet loss happened when the distance between nodes is 10 meters. The worst packet loss results at a 500 ms sending interval is 81.25% when the position between nodes is 300 meters, when the sending interval of 750 ms is 61.25% with the difference in location between nodes 300 meters, when the sending interval is 1000 ms is 35.91% and the distance between nodes is 300 meters, when the 2000 ms sending interval was 53.20% with a 300 meter distance difference and when the 3000 ms delivery interval was 65.71% with a 300 meter node distance. So it can be concluded that the worst packet loss happened when the distance between nodes is 300 meters