When floodwaters swept a chunk of riverbank into the Mekong just south of the Cambodian capital, Phnom Penh, Sun Ramaly managed to save her clothes and her kitchen utensils. Her one-room shack, however, crumbled into the river.

Along with a handful of families whose meager possessions were also washed away in 2002, Ramaly collected any scraps of timber and tin she could find and walked up the riverbank to find a place to rebuild.

"We are from the lowest economic class. We don't have land, so we don't have options," Ramaly said.