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

SOUNDING CORRECTION ABACUS - AMAZON RIVER WATER LEVEL: The information about Santarm 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 Estaes Costeiras (RENEC), from Belm, Breves, Santarm, 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 Servio de Sinalizao Nutica do Norte  Belm, Capitania dos Portos da Amaznia Oriental  Belm, Delegacia da Capitania dos Portos  Santana, Delegacia Fluvial  Santarm, Capitania Fluvial da Amaznia Ocidental  Manaus and Servio de Sinalizao Nutica do norte  Belm.