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underground economy

Title English: 
underground economy
Definition English: 
Groundwater (or ground water) is the water present beneath Earth's surface in soil pore spaces and in the fractures of rock formations. A unit of rock or an unconsolidated deposit is called an aquifer when it can yield a usable quantity of water. Groundwater is often cheaper, more convenient and less vulnerable to pollution than surface water. Therefore, it is commonly used for public water supplies.
Title Arabic: 
اقتصاد سري
Domain: 
Sustainable Development
Subject: 
Water Resources
InformationType: 
Term
SourceSymbol: 
language staff