[H-CG23] Cultural Hydrology

[HCG23-P03] Results of a Survey on the Utilization of Local Water Sources in the Noto Peninsula

*Takashi Nakamura¹, Kei Nishida¹, Tatsuru Kamei¹ (1.International Research Center for River Basin Environment, University of YAMANASHI)

Keywords:Noto Earthquake, evacuation life, Domestic water use, Local Water Sources

The purpose of this study was to examine the diversification of water supply through the use of a small-scale water supply system using filtration in the Noto Peninsula, which suffered extensive water outages due to the earthquake that occurred on January 1, 2024. The Mitsui district of Wajima City and the Manoura district of Suzu City were selected as the study areas, and water samples from streams, wells, and springs were collected to measure turbidity and hardness. In the Mii area, groundwater with significant iron and hardness was found in the Quaternary sedimentary lowlands in the mountains, while the presence of high-quality spring water and groundwater was evident in the mountainous areas. On the other hand, in Suzu City, due to its proximity to the epicenter, there were frequent slope failures that changed the topography, and the resulting turbidity of surface water was an issue for water use. Therefore, a turbidity map of local water sources was created, and points with relatively low turbidity were selected. In addition, water sources with water quality that would allow stable operation of the small water supply system were identified, and then water sources were selected based on distance from the village and access conditions. As a result, the water sources identified as operational were consistent with those that had been used as community water supply systems before the spread of water supply in both the Mii and Manura districts. This confirmed that the utilization of community water sources that were used in the past plays an important role in the establishment of small-scale water systems when considering the diversification of water supply systems.