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For the purpose of abating overflow pollution from storm pumping discharge, a real-time monitoring system for storm drainage storage was developed, based on pipe storage model, ultrasonic sensors, wireless communication and web-based geographic information system. The monitoring system has been applied into Caohejing drainage system, Shanghai, a separate drainage system with dry-weather pollution entry into storm pipes. It demonstrates added storm drainage on the basis of terminal drainage water elevation of 2.6m, the current critical condition to operate storm pumps. The real-time monitoring system lays foundation for development of real-time control system of the study area.