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The Portuguese Environment Agency holds an important archive resulting from the century-old activity of the Water Services in charge of water management and water resources planning, which should be studied and made public. The documental and technical collections of the former Douro Water Services (SHD) represent an opportunity to understand a public institution, where water and its use profoundly mark social relationships and economic activities. The archive tell of case studies on the uses of public water for different purposes and the modalities of its use. Thus, several areas of scientific interest are taken into account in the analysis of these processes, as well as the problems, impacts and limitations of human activities on the management of the Public Waterways Domain. This article presents case studies of particular interest in historical terms related to the Ave River basin, located on the coastal region of northwest Portugal and the evolution of its watercourses’ morphometric features.

A IMPORTÂNCIA DAS FONTES HISTÓRICAS PARA O CONHECIMENTO DOS CURSOS DE ÁGUA: O CASO DO RIO AVE (NOROESTE DE PORTUGAL)