Portugal - Atlas do Ambiente I.16 - Qualidade Química das Águas Subterrâneas

Summary

Four charts dealing with the chemical quality of the Portuguese ground wa- ters are published, namely those referring to the filtrate residue, chloride con- tent, sulphate content and hardness (total, carbonate and non carbonate). These charts show that the mainland of Portugal can be divided into three main parts, the so called Northern, Western and Southern Provinces. The Northern Province, to the north of the Tagus river, is characterized by a slightly 5