The rains had washed out bridges, cutting off aid from neighbouring provinces.
Agricultural land is flooded, affecting current and future food security.
Natural disasters are further eroding living conditions for many Angolans whose lives have been ruined by a decades-old civil war in the southwest African country. The U.N. was expected to begin distributing food aid on Thursday, while other agencies were to offer emergency kits and plastic sheeting. The U.N. has urged the Luanda government to dispatch helicopters to remote areas, and also appealed for international financial support. At least 16 people were killed and hundreds of homes destroyed in flash floods after storms pounded Luanda itself on Sunday. The conflict has killed about one million people and devastated the country's infrastructure.