Insufficient for most purposes

Stock and domestic supplies

Town, irrigation or industrial

Note that on a local scale yields can vary considerably. The map is highly generalised. The actual yield limits that the colours are based on are:

Insufficent for most purposes: Less than 0.5 Litres/sec.
Stock and domestic supplies: 0.5 to 5.0 Litres/sec.
Town, irrigation or industrial: More than 5.0 Litres/sec.