Scientists study ways to safeguard water

U.S. researchers say the smartest way to safeguard a reservoir's water is to let it drain into the ground.

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<p><a href="http://www.physorg.com/news77802581.html">Scientists study ways to safeguard water</a></p> <p>U.S. researchers say the smartest way to safeguard a reservoir's water is to let it drain into the ground. </p>