Manual scavenging is a hazardous and inhumane practice that exposes people to dangerous gases, infected trash, and hostile environmental conditions in drainage systems. To enhance safety and efficiency in the work process of manual scavenging, the current project suggests a Smart Drainage System for Manual Scavengers with the help of IoT technology. The proposed system combines various sensors such as ultrasonic sensors to measure increasing water levels, gas sensors to detect harmful gases like methane and carbon monoxide, temperature sensors to detect abnormal temperatures, and flame sensors to spot fire hazards. These sensors together continuously capture the data from the environment and forward it instantly to an IoT-based mobile application through a Wi-Fi-enabled microchip. The application facilitates continuous drainage inspection and sends instant alerts in case any parameter goes outside of the safe limit so that instant and informed decisions can be made. In addition to that, the system has the feature of automated drainage through a solenoid valve that triggered once water levels exceed a set boundary so that overflow is prevented and labor costs lessen. By integrating real-time tracking, automated response, and mobile alerts, the smart system enhances the working environment and safety of manual scavengers to a great extent and helps in making the drainage management process hygienic and eco-friendly to a large extent.