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2. Water table - Wikipedia

   en.wikipedia.org/wiki/Water_table

   The slope of the water table is known as the “hydraulic gradient”, which depends on the rate at which water is added to and removed from the aquifer and the permeability of the material. The water table does not always mimic the topography due to variations in the underlying geological structure (e.g., folded, faulted, fractured bedrock).

3. Sand table - Wikipedia

   en.wikipedia.org/wiki/Sand_table

   Sand tables have been used for military planning and wargaming for many years as a field expedient, small-scale map, and in training for military actions. In 1890 a Sand table room was built at the Royal Military College of Canada for use in teaching cadets military tactics; this replaced the old sand table room in a pre-college building, in ...

4. Water table (architecture) - Wikipedia

   en.wikipedia.org/wiki/Water_table_(architecture)

   A water table is a projection of lower masonry on the 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 ...

5. Groundwater recharge - Wikipedia

   en.wikipedia.org/wiki/Groundwater_recharge

   Wetlands help maintain the level of the water table and exert control on the hydraulic head. [ 5 ] [ 6 ] This provides force for groundwater recharge and discharge to other waters as well. The extent of groundwater recharge by a wetland is dependent upon soil , vegetation , site, perimeter to volume ratio, and water table gradient.

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   It's sand-proof and water-resistant, plus it doesn't get picked up by the wind. It's made of 210 polyester, which repels water even better than an umbrella, and easily shakes off any sand that ...

7. Aquifer - Wikipedia

   en.wikipedia.org/wiki/Aquifer

   The water content in the unsaturated zone is held in place by surface adhesive forces and it rises above the water table (the zero-gauge-pressure isobar) by capillary action to saturate a small zone above the phreatic surface (the capillary fringe) at less than atmospheric pressure. This is termed tension saturation and is not the same as ...