Of the following situations, which is the most likely to present the most severe loading conditions on a concrete dam?

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Of the given situations, the one that is most likely to present the most severe loading conditions on a concrete dam is when the reservoir is empty and the soil is in a natural drained condition. Concrete dams are designed to support the weight of soil and water, and the foundation pressures are assumed to act uniformly across the full width of the structure. When the groundwater table and surface water elevations are both extremely low, a significantly increased ratio of vertical to horizontal pressure may result.

Of the Following Situations, Which Is the Most Likely to Present