The storm devastated Mississippi beach towns and left most of New Orleans flooded when the city's protective levees failed at several points.

CNN: Brown serving as consultant to FEMA

"We are urging the government and beach managers to adopt a mandatory national scheme to provide permanent public information about storm pollution on every bathing beach, " said Mr Bell.

BBC: NEWS | UK | Heavy rains 'pose bathing risk'

Two years after Katrina's storm surge swallowed 6, 000 of the 25, 000 homes and businesses along Biloxi Beach Boulevard, storm debris has been cleared to make way for high-rise hotels, condominiums, casinos and other businesses.

CNN: Tale of two cities: Biloxi and New Orleans