History of Dam Construction and Water Quality Issues - Summary
In 1999, eutrophication at the Shichigajuku Dam in Miyagi Prefecture caused a serious outbreak of blue-green algae, and phosphorus levels reached more than 20 times the standard value. In the 2000s, measures such as circulators and sediment removal were implemented, but their effects were limited. In the 2010s, the introduction of phosphorus adsorbents and groundwater recharge models were piloted and improvements were seen in some areas, but environmental impacts and community impacts remain a challenge. Continued environmental protection and sustainable water resource management are required.
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