AMAZON RIVER WATER LEVEL PERIODS: Water Level increasing period: November to June – Maximum Level: June to July. Water Level decreasing period: July to October– Minimum Level: October to November

SOUNDING CORRECTION ABACUS - AMAZON RIVER WATER LEVEL: The information about Santarém River Water Level for use with the Sounding Correction Abacus, that are in this chart, are disseminated daily by radiotelephony using the Ner Rede Nacional de Estações Costeiras (RENEC), from Belém, Breves, Santarém, Parintins, Itacoatiara e Manaus. These information can lso be obtained a at the internet website www.mar.mil.br/chm/avgantes/avradio/amazonia.htm or directly at the Serviço de Sinalização Náutica do Norte – Belém, Capitania dos Portos da Amazônia Oriental – Belém, Capitania dos Portos no Amapá, Delegacia Fluvial – Santarém, Capitania Fluvial da Amazônia Ocidental – Manaus and Serviço de Sinalização Náutica do norte – Belém.