Investigation of Flood Control by Rainwater Infiltration Facilities in Urbanized Watershed

Abstract

The runoff discharge model developed for an urbanized watershed is extensively applied to examine the usefulness of the rainwater infiltration facilities to control the water level during flooding . The rainwater infiltration facilities examined are the permeable pavement and the house infiltration system . From the simulated results the followings are clarified . Reinforcement of permeability covering the pervious ground surface with the permeable pavement is ineffective to lower the water level. The peak water level is reduced by replacing the impermeable pavement with the permeable one in the parking lots . And multiple use of the rainwater infiltration facilities is effective for decreasing the occurrence of inundation by lowering the water level and is effective to delay the time of peak water level .

Urban Flood Runoff Modeling in Japan: Recent Developments and Future Prospects

“…In contrast to lumped models, distributed models explicitly incorporate the spatial variability of watershed characteristics. With the widespread use of Geographic Information System (GIS) technology, distributed physical models have been widely used in small-tomedium-sized urban watersheds, where the effects of land use change and flood control facility development on runoff characteristics have been evaluated [25][26][27]. The main advantages of commonly used grid-based distributed models are their simple structure and their use of spatially explicit watershed information, which is generally readily available.…”

Investigating the Influence of Various Stormwater Runoff Control Facilities on Runoff Control Efficiency in a Small Catchment Area

“…A legal system for implementing such measures was established in the Act on Countermeasures against Flood Damage of Specified Rivers Running Across Cities [30]. Furthermore, technological development and verification of the effects of rainwater retention facilities and permeable pavement have been conducted [31][32][33][34]. These facilities have been introduced by various administrative agencies.…”