Changes

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<gallery mode="packed" widths=300px heights=300px>

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Check dams.png| Distance between dams determined by equaling the crest of each dam, with the elevation of the toe of the upstream dam.

Check dams.png| Distance between dams is determined by equaling the elevation of the crest of each dam, with the elevation of the toe of the upstream dam (vertical height exaggerated).  

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