Sewage systems have two important public functions: to protect the environment from waterborne pollution, and to prevent flooding resulting from rainstorms. Rainwater movements affect both functions. The capacity of water-holding basins hasrecently been decreasing due to the expanding area of paved roads. As a consequence, the operation of sewage facilities has become very difficult due to the increasing quantity and sudden arrival of rainwater runoff.We have developed system technologies for rainwater drainage in which information from rain gauges and/or flowmeters is appropriately gathered according to the purpose of use, and a combination of advanced information processing technologies is employedincluding rainfall movement forecasting, runoff and flow calculation, and fuzzy technologies. These system technologies permit the alleviation of the problems mentioned above.
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