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Rapid development of populated urban areas in Taiwan has stimulated the change of hydrological environment in the past twenty years. The land development has resulted in increasing the runoff peak and shortening the time to peak discharge, which reduce the resilience of cities during severe rainstorms. Considering that engineering measures may not be easy to implement in populated cities, detention facilities installed on building basements have been proposed to compromise the increase of surface runoff resulting from development activities. In this study, a web-based operational platform has been developed to integrate the GIS technologies, hydrological analyses, as well as relevant regulations for the design of detention facilities. The design procedure embedded in the system includes a prior selection of the type and size of the detention facility, integrated hydrological analysis for the developing site, and inspection of relevant regulations. After login the platform, designers can access the system database to retrieve road maps, land use coverages, and sewer network information. Once the type, size, inlet, and outlet of the detention facility are assigned, the system can acquire the rainfall intensity-duration-frequency information from adjacent rain gauges to perform hydrological analyses for the developing site. The increase of the runoff volume due to the development and the reduction of the outflow peak through the construction of the detention facility can be estimated. The outflow peak at the target site is then checked with relevant regulations to confirm the suitability of the detention facility design. The proposed web-based platform can provide a concise layout of the detention facility and the drainageway of the developing site on a graphical interface. The design information can also be directly delivered through a web link to authorities for official inspection to simplify complex administrative procedures.

detention facility; web-based platform; hydrological analysis