標準等危険度線による雨水浸透施設の評価手法

概要

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Urbanization of a river basin increases the peak discharge and total depth of a single storm. Any increase in the discharge of a combined sewer requires greater storm-water drainage capacity, which can be costly. By installing storm-water infiltration facilities to control runoff, it is possible to reduce the required capacity and the frequency with which untreated sewage is released into public waters. In this paper, a functional evaluation of storm-water infiltration has been conducted. In Japan, hourly rainfall records are available nationwide. The 60-minute rainfall maximum, the peak rainfall in any 60-minute period, is normally larger than the hourly rainfall on the hour. For a given rainfall, the peak discharge depends on the concentration time. This paper describes how hourly rainfall records should be handled. An equation for a standard equi-risk line has been suggested when evaluating urban river basin control systems utilizing storage. In a combined sewer system, the sewer facility provides the storage, so the catchment for the system is the urban river basin itself, and the standard equi-risk line can be applied to the sewer facility without modification when the treatment capacity is assumed to be constant. Some examples of the use of standard equi-risk lines are introduced. This paper shows that the effects of a storm-water infiltration system can be evaluated by these lines.
近畿大学工業高等専門学校の論文
2003-12-01