The annual amount of water that can be taken from a source or supply over a period of years without depleting that source beyond its ability to be replenished naturally in "wet years".
The safe yield or exploitable groundwater is the quantity of groundwater which can be withdrawn over a long period without impairing the aquifer as a water source or causing contamination by intrusion of seawater into the aquifer.
The maximum dependable water supply that can be withdrawn continuously from a surface water or groundwater supply during a period of years in which the driest period or period of greatest deficiency in water supply is likely to occur.
The annual quantity of water that can be taken from a source of supply without depleting the source beyond its ability to be replenished.
The amount of water that can be removed from a source (aquifer, river, etc.) on a sustained basis without unacceptable depletion of the resource.
The maximum quantity of water that can be withdrawn from a groundwater basin over a long period of time without developing a condition of overdraft. Sometimes referred to as sustained 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.
The amount of ground water that can be withdrawn continually from an aquifer in an economical and legal manner without having any adverse effect on the ground water resource or on the surrounding environment.
The maximum quantity of water that can be continuously withdrawn from a groundwater basin without adverse effect.
The amount of water which can be withdrawn from an aquifer on a long-term basis without serious water quality, net storage, environmental or social consequences.
