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<gallery mode="packed" widths=200px heights=200px>
<gallery mode="packed" widths=200px heights=200px>
File:Percolation trench.jpg|Percolation trench. Photo credit: [[Acknowledgements|Moreau1]]
File:Percolation trench.jpg|View of infiltration trench in U.S. Photo credit: [[Acknowledgements|Moreau1]]
</gallery>
</gallery>
[[category:Gallery]]
[[category:Gallery]]