As in 2009, the government has declared a state of emergency, and seven regions - Kunene, Caprivi, Kavango, Ohangwena, Omusati, Oshikoto and Oshana - have been listed as flood-affected.
Unconfirmed statistics from the Namibian Red Cross suggest 37,600 people have been displaced by the floodwater.
"Flood conditions in northern Namibia are expected to be exacerbated by another flood wave coming from Angola, impacting mainly the western part of Ohangwena and Oshana," the report said.
More rain has been forecast in the already waterlogged areas in the next few days, "which would worsen the current flood situation further," the report said.
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