Associate Professor Kihiro Yokota of the Department of Environmental Creation, Faculty of Environment, Tokyo City University has developed a tool to diagnose whether the land is privately owned and can contribute to the reduction of flood risk using the app.Diagnose and informatize the rainwater storage and infiltration effect of green spaces and plants (parks, roadside trees, gardens, exteriors, etc.) in urban areas where there is concern about inland water inundation * in which rainwater flows backward from manholes during heavy rains. ..
With the increase in torrential rains in recent years, the importance of "basin measures" aimed at controlling the outflow of rainwater and reducing the load on sewerage has been pointed out.As one of the solutions, the introduction of "Green Infrastructure" (GI for short) that uses green spaces and plants in the basin to store and infiltrate rainwater, return it to nature, and allow it to flow slowly. Is attracting attention, and active introduction is already progressing in Western cities.In Japan, Setagaya Ward has positioned green infrastructure in the torrential rain countermeasure action plan, and full-scale development is expected in Japan as well.
Associate Professor Yokota diagnosed and computerized the effects of green spaces and planting to control the outflow of rainwater in urban areas where inland water inundation is a concern during heavy rains.Functions as a green infrastructure for the entire basin of urban rivers, such as the position of green areas and plants with respect to the water flowing on the surface of the earth, and the amount of water collected from the catchment area. Was classified and mapped.Using the data, we have developed an application that investigates the functions of privately owned green spaces and plants in the catchment area from the viewpoint of "blocking, infiltration / storage, outflow, catching, and overflowing" and makes a simple diagnosis.It was visualized that the residents can contribute to reducing the load on the sewerage through the management of the garden.
By utilizing the results of this research, it will be possible to consider in land use what kind of green space in which area in the basin should be actively utilized to reduce stormwater runoff.In the future, we will evaluate the degree of consideration for the arrangement and structure of greenery in the gardens of private houses and the exterior space of apartment houses, and support the installation and management of plants that can contribute to the control of rainwater runoff, and the activities of citizens. schedule.
* Inland water inundation is a phenomenon that occurs when rainwater that has fallen in the city flows into the sewer at once, causing the water to flow back from the manhole, etc., without being able to flow completely in the sewer.
