Abstract
This study examined the potential contribution of the method of watershed planning in the Parks and Open Space Master Plan by using a case study in the Tsurumi River Basin. In the Tsurumi River basin, rapid urbanization has caused large amounts of rainwater to flow into the river at once, causing flood damage frequently. It has become difficult to prevent flood damage only through river improvements. Flood control measures have been taken not only in the river area but also in the watershed area in a comprehensive way that include green infrastructures. Green infrastructures include such as multipurpose retarding basin, reservoir, preservation of green spaces, dry wells and trenches, rain garden, etc. During Typhoon Hagibis in 2019, those green infrastructures in the Tsurumi River Basin played a significant role in preventing flood damage. Also, landscape ecological planning from the viewpoint of biodiversity conservation was developed in the Tsurumi River Basin as a precedent case in Japan. In conclusion, we pointed out that, as the risk of disasters increases due to climate change, and the biodiversity crisis will become more critical, introducing the method of watershed planning in the Parks and Open Space Master Plan will become more important in the future.
