Fundamental study on measures of flood control considering groundwater recharge-Attempt utilizing regional characteristics-

日本的北国地区有许多水井被用作融雪设施。这项研究探讨了利用这些井进行内陆防洪的实际应用。为了防止雨季和台风季节的内陆洪涝灾害，提出了将雨水直接注入油井的方法。为了研究雨水直接回灌对地下水环境的影响，在新泻的三宅市进行了田间注水试验。很明显，这些油井提供了足够的注入能力。虽然注水使井内地下水变成了雨水，但停止注水后，地下水水质逐渐恢复到原来的状态。然而，在注入大约两天后，在油井中检测到了铁细菌和氧化铁团等堵塞物质。

The Hokuriku region of Japan has many wells used as snow melting facilities. This study treats the practical applications of inland flood control using those wells. The method, in which rainwater is injected directly to the wells, is proposed to prevent inland flooding during rainy and typhoon seasons. Field injection tests were conducted in Mitsuke city of Niigata to examine the effects of the direct recharge of rainwater on the groundwater environment. It became clear that the wells provided sufficient capacity of injection. Although groundwater in the well was changed to rainwater by the injection, the groundwater quality gradually returned to its prior state after stopping the injection. However, clogging substances such as iron bacteria and iron oxide flocks were detected in the well about two days after the injection.