Mumbai: BMC is upgrading its rainwater logging detection systems by including GPS anti-theft tracking systems, vehicle-hit sensors, and anti-tilt sensors to ensure that they operate accurately. In the last three years, BMC has installed as many as 100 auto-activated rainwater logging level detection systems at various chronic waterlogging spots in the city. But, said civic officials, there have been instances of some systems being hit by vehicles, stolen by miscreants, or damaged by pedestrians. “Anti-social elements, like drug addicts, steal the water level indicators to make a quick buck. We cannot control these incidents. Therefore, we decided to upgrade the systems with features such as GPS-based anti-theft tracking systems, GPS geo-tagging for live mapping of the systems, anti-tilt sensors for checking system abnormalities, and vehicle-hit sensors so that if it is stolen or damaged, we would immediately get an alert,” said a civic official, adding that contractors would repair the damaged systems as part of the operation and maintenance contract. The auto-activated rainwater logging level detection system measures the level of water on the road during heavy rainfall and flood-like situations and the time taken for rainwater to recede at chronic waterlogging spots. The system is based on an IoT platform and can provide inputs on the actual rainfall in millimetres per hour at intervals of 15 minutes or as programmed during waterlogging conditions. It is also equipped with automatic rain gauges, which record the amount of rainfall in a waterlogged spot and also enables BMC to collect localised data on the level of waterlogging in an area.The stormwater department has been devising measures to prevent waterlogging at chronic spots.