Abstract
This research integrates real-time storm sewer simulation and Web GIS technology, in order to achieve early warning about urban inundations and reduce damage by flood disaster during storm period. The module of real-time storm sewer simulation (RTSS) was implemented by combining SWMM-RUNOFF, a rainfall-runoff model, and SWMM-EXTRAN, a storm sewer model, as well as the concept of real-time simulation; it is able to immediately perform hydrodynamic modeling for sewer flows by giving real-time rainfalls. Moreover, the RTSS also can overcome the problem that is the rainfalls have to be completely inputted prior to simulation in conventional storm sewer modeling, which burdens computing time and lacks availability of real-time simulation. In addition, the real time simulated results of the RTSS with Web GIS technology can let the results by real-time simulation cooperate with spatial information in order to show, upgrading the efficacy of early warning about urban inundations. The research develops a urban sewer warning system (USWS) , cut the real-time storm sewer simulation technology as the computing kernel, and utilize Web GIS technology show the results by real-time simulation immediately; USWS achieve early warning and reduce flood damage by warning icons, which can show whether manhole be overflowing status. In Taipei city, Zhung-Gung, Bao-yi and Shi-Jian drainage system are employed for the practical case study. Considering the design storm with 5-year intensity and 24-hour period for Taipei city, comparing with conventional simulation strategy, the RTSS not only gives identical simulation results, but saves computing time and speed up the efficiency. Consequently, it is possible to further achieve the real-time warning for storm sewers so as to mitigate the disasters.
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