salt water

Water having high concentration of salts.


A product without a mass.

shallow groundwater

Groundwater that is located less than three meters deep.


supply mix

A production mix with the addition of the import of the specified product to the geographical area.

surface water

Fresh water you can see as overland flow, rivers and lakes excluding sea water. A distinction is not made between lake and river water.

system model

A model describing how activity datasets are linked to form product systems. A system model may determine factors such as whether to use allocation (and which type of allocation) or substitution to handle the multi-functionality problem, or whether to use average or marginal suppliers. It may also affect how by-product treatments are assessed. Synonym (input-output economics): Technology model.