In the past years, urban flooding due to clogged drains has been a persistent problem in many Indian cities. Even well-planned areas like Gurugram that lie in the NCR region faced extreme waterlogging during monsoons. This research presents a low-cost Smart Drainage Alert System that uses IoT sensors to monitor water levels and detect possible blockages. The proposed model uses an ultrasonic sensor to detect rising water levels, connected to a microcontroller and cloud platform for live data tracking. When the water levels exceed a set threshold limit, the system sends an alert to the user via a mobile application. A small-scale prototype demonstrates that IoT-based monitoring can provide affordable, effective drainage management for communities.