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Safe Yield
With reference to either a surface-water or groundwater supply, the safe yield is typically considered to be the maximum rate of continuous diversion or withdrawal that can be maintained indefinitely without depleting the supply. In some cases, the safe yield may be defined for a specified duration when the resource is not used for a continuous supply. Analogous to Practical Sustained Yield and Reservoir Net Yield. Such definitions potentially ignore natural groundwater discharge to surface waters, the reduction in instream flows caused by groundwater withdrawal, or impacts on existing wells. Therefore, the ISWS will no longer use these terms. Instead, the ISWS elects to use the term Yield and explicity state all conditions and assumptions that stand behind the determination of it.
Sandstone
Sedimentary rock composed of sand-sized clasts.
Scarce Good
A good which people want more of and which is costly to obtain.
Scarcity Shortage
A term used when the quantity of a good demanded exceeds the quantity supplied at the existing price.
Scattered Clouds
Sky condition when between 1/8 and 4/8 are covered.
Sea Breeze
A wind that blows from a sea or ocean towards a land mass. Also known as an onshore breeze.
Sea Surface Temperature
Surface temperature data collected using IR satellite imagery, buoy and ship data.
Second-foot
Same as cfs. This term is no longer used in published reports of the U.S. Geological Survey.
Secondary oil recovery
Injection of water into an oil well after primary oil recovery to force out some of the remaining thicker crude oil. See enhanced oil recovery, primary oil recovery.
Sector
Division, most commonly used to denote type of energy consumer (e.g., residential) or according to the Intergovernmental Panel on Climate Change, the type of greenhouse gas emitter (e.g. industrial process). See Intergovernmental Panel on Climate Change.

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