By Roland Buerk
BBC correspondent in Dhaka
A team of United Nations officials is in Bangladesh to co-ordinate an international response to the devastating floods in the country.
Water in Dhaka is getting dirtier with untreated sewage
Rivers are now receding in the north and north-east, but at least 40% of the capital, Dhaka, remains flooded.
The disaster response experts are in Bangladesh to assess what is needed.
Bangladesh's government has estimated the damage to roads, bridges, schools and hospitals at $7bn. At least 30m people remain homeless or stranded.
Forecasters say they expect the rivers in the north and north-east of Bangladesh to continue to recede.
The word 'monsoon' comes from the Arabic for 'season'
Describes seasonal reversals of wind direction
From April heat builds over South Asia, creating low pressure areas
Brings moisture-rich south-west winds in from the ocean
The UN is preparing to appeal to member countries for more money to help distribute food and medicine and to rebuild infrastructure once the waters subside.
Aid agencies working here say the country has sufficient emergency supplies of food, but the difficulty is getting it to areas cut off by the flooding.
But as the waters go down, outbreaks of diarrhoea are increasing.
In central areas around the capital, there will be no let-up in the flooding for at least another 48 hours.
The full moon is causing high tides in the Bay of Bengal that are impeding the flow of water to the sea.