上谷沼調節池, Retention basin in Kawaguchi, Japan.
Kamiyanumacho Retention Basin is a flood control facility in Kawaguchi that maintains water levels to manage surface runoff and prevent overflow during heavy rains. The installation stores water across a large area and is designed to expand as urban development continues.
This facility was built in response to repeated flooding of the Fujemon River during the post-war urban growth of the Urawa and Kawaguchi areas. The construction addressed the need to control water overflow as the regions expanded rapidly.
The site once functioned as the Kamiya Marsh, an area dedicated to eel farming before its transformation into a modern water control facility. The name and local memory still reflect this agricultural past.
The site is accessible within the urban area of Kawaguchi and can be reached by public transportation or on foot. Visitors should note that water levels can rise during rainy periods, affecting access to certain areas.
The southern portion contains Kawaguchi City's Kamiyanumacho Sports Ground, which intentionally floods during periods of high water. This dual-use approach demonstrates how water management and recreational space can coexist in densely developed urban areas.
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