See also

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Salt water - As defined in this study, water with chloride concentration above the CDWQG value of 250 mg/L (EC of greater than ~1,000 μS/cm).
Saltwater Intrusion - The migration, either lateral or vertical, of saltwater into freshwater aquifers under the influence of groundwater development such as pumping of freshwater near a source of saltwater.
Significant Aquifer - A permeable water-bearing horizon of sufficient thickness and lateral extent that can yield useable quantities of water. An aquifer in excess of 5 m thick, 100 m or more in width and extending a lateral distance of 500 m or more may be considered a significant aquifer.
Static - Characterized by a fixed or stationary condition.
Steady-state - A condition that does not change over time, or in which any one change is continually balanced by another, such as the stable condition of a system in equilibrium.
Storativity - The volume of water released from, or taken into, storage by a confined aquifer per unit surface area of aquifer per unit change in hydraulic head.
Stratigraphy - The geological science concerned with the study of sedimentary rocks in terms of time and space.
Stress - Stress is a relative measure that compares the amount of water going into and out of a system. When more water is extracted than replenished, the system may experience stress. Stress can also be seasonal and variable. Aquifer stress compares the total demand for groundwater to the amount of natural aquifer recharge. Surface water stress compares the total demand and minimum conservation flows to the amount of natural water supply and storage.
Strike - The strike line of a bed, fault, or other planar feature is a line representing the intersection of that feature with a horizontal plane.
Subcrop - An occurrence of the strata directly beneath an unconformity (e.g., base of unconsolidated materials constituting a weathering surface).
Surface Water - Water that flows in streams and rivers, and exists in natural lakes, wetlands, and in reservoirs.
Sustainable - A characteristic of an ecosystem that allows it to maintain its structure, functions and integrity over time and/or recover from disasters without human intervention.


See also
Acronyms & Units, Water 101