Ōsagami Reservoir, Retention basin in Koshigaya Laketown, Japan.
Ōsagami Reservoir is a water storage facility in Koshigaya Laketown that collects and manages rainwater from surrounding urban areas. The water body serves residential neighborhoods and commercial zones by maintaining consistent supplies year-round.
The reservoir was constructed in 2014 to address growing water management demands in Kanagawa Prefecture during a period of urban expansion. It became part of a larger development strategy to handle water-related challenges in the rapidly growing region.
The reservoir serves as an important water source for the residential community around it, supporting daily needs while sitting within a planned development area. Local residents use the surrounding paths and green spaces for walking and casual outdoor activities.
The site can be accessed through marked pathways and walkways running around the perimeter of the water body. Visitors should keep in mind this is operational infrastructure and exercise caution, particularly when weather conditions change.
During warm seasons, the water develops two distinct temperature layers that affect how nutrients spread and support living organisms throughout the basin. This natural layering demonstrates how the system changes with seasonal temperature shifts.
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