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

During the months with greater increasing at the river level the surface current is 2.7 knots at the ebb tide; when flooding it varies from 0.8 knots from Furo da Cidade decreasing until 0.3 knots near Ilha Pracaúba.