A major metropolitan drainage network serves as the core infrastructure for stormwater drainage and sewage transport. As the city continues to expand, the drainage network has grown significantly, making traditional manual inspection methods inefficient. Real-time water level changes in manholes and stormwater tanks were unavailable, leading to risks of flooding and blockages during the rainy season, threatening drainage safety. To achieve intelligent, visual management of the drainage network, the city decided to automate water level monitoring in key areas.

1. 1.Addressing confined spaces and wall interference: The GLT744’s narrow 6° beam angle was leveraged, requiring installation at least 30cm away from manhole walls. Additionally, the device's false echo learning function was used to filter out interference from walls, pipe supports, and other structures, creating a customized threshold curve to ensure accurate water level readings.

2. Ensuring reliable operation in harsh outdoor environments: All units were equipped with stainless steel housings. The IP68 rating and wide operating temperature range (-30°C to 70°C) guaranteed stable performance under heavy rain, high temperatures, and low temperatures. Solar power systems were added to remote monitoring points without grid access.

3. Enabling fast commissioning and remote data transmission: The RS485 / MODBUS communication interface transmitted water level data from all monitoring points via wireless IoT gateways to the city’s drainage management platform, enabling real-time data upload and visualization. On-site commissioning was completed using the Bluetooth mobile app, requiring no specialized tools, significantly improving deployment efficiency. Remote platform monitoring allowed maintenance teams to check device status and perform targeted on-site maintenance, reducing management costs.

Following the upgrade, the city achieved 24/7 real-time water level monitoring in core drainage areas. During the rainy season, water level data provided early warnings of flood risks, enabling timely drainage responses. The efficiency of urban drainage management increased by 80%, effectively preventing waterlogging and providing solid technical support for the city's drainage safety.