PORT-AU-PRINCE – Survivors of Haiti's catastrophic earthquake have had one saving grace: There's been no significant rain since the disaster. But that won't last.

The rainy season in Haiti is deadly even in a good year. Now, in a devastated capital city, the early spring rains threaten to cause landslides and bring about health problems in the makeshift camps where more than 500,000 people are living.

Rain is already falling in some parts of the country, but Haiti's shattered capital, where most of the quake damage occurred, has been spared so far a rarity for this time of year, when afternoon showers are common. Steady rains could come as soon as the end of the month, and hurricane season begins in June.

Workers are racing to move victims outside of flood plains and into tents. They are also trying to clear tons of debris from ravines, canals and riverbeds, so rain does not turn the survivors' encampments into breeding grounds for disease.

"There will be health concerns," said engineer Mario Nicoleau of the U.S. Agency for International Development's office in Haiti. "The risks will be enormous, and it is difficult to contemplate the unforeseen consequences."

Haiti's government said it needs more money or tents if people are to be moved.