A water table is a projection of masonry on the lower outside of a wall, slightly above the ground, or at the top of a wainscot section of a wall (in this case also known as a sill).
It is both a functional and architectural feature that consists of a projection that deflects water running down the face of a building away from lower courses or the foundation. A water table may also be primarily decorative, as found near the base of a wall or at a transition between materials, such as from stone to brick. The top of the water table is often sloped or chamfered to throw off water.
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