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Originally published October 21, 2007 at 12:00 AM | Page modified October 21, 2007 at 2:02 AM

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As Bangkok slowly sinks, Thailand hunts for solutions

At Bangkok's watery gates, Buddhist monks cling to a shrinking spit of land around their temple as they wage war against the relentlessly...

The Associated Press

KHUN SAMUT CHIN, Thailand — At Bangkok's watery gates, Buddhist monks cling to a shrinking spit of land around their temple as they wage war against the relentlessly rising sea.

During the monsoons at high tide, waves hurdle the breakwater of concrete pillars and the inner rock wall around the temple on a promontory in the Gulf of Thailand. Jutting above the water line just ahead are remnants of a village that already has slipped beneath the sea.

Experts say these waters, aided by sinking land, threaten to submerge Thailand's sprawling capital of more than 10 million people within this century. Bangkok is one of 13 of the world's largest 20 cities at risk of being swamped as sea levels rise in coming decades, according to warnings at the recent Intergovernmental Panel on Climate Change held here.

The city, built on clay rather than bedrock, has been sinking as much as 4 inches annually as its teeming population and factories pump some 2.5 million cubic tons of cheaply priced water, legally and illegally, out of its aquifers. This compacts the layers of clay and causes the land to sink.

Everyone — the government, scientists and environmental groups — agrees Bangkok is headed for trouble, but there is some debate about when.

Once known as the "Venice of the East," Bangkok was founded 225 years ago on a swampy floodplain along the Chao Phraya River. But beginning in the 1950s, on the advice of international development agencies, most of the canals were filled in to make roads and combat malaria. This fractured the natural drainage system that had helped control Bangkok's annual monsoon season flooding.

Smith Dharmasaroja, chair of the government's Committee of National Disaster Warning Administration, urges that work start now on a dike system of more than 60 miles — protective walls about 16 feet high, punctured by water gates and with roads on top, not unlike the dikes long used in low-lying Netherlands to ward off the sea. The dikes would run on both banks of the Chao Phraya River and then fork to the right and left at the mouth of the river.

Oceanographer Anond Snidvongs, a leading scientist in the field, says other options must also be explored, including water-diversion channels, more upcountry dams and the "monkey cheeks" idea of King Bhumibol Adulyadej. The king, among the first to alert Bangkokians about the yearly flooding, has suggested diverting off-flow from the surges into reservoirs, the "cheeks," for later release into the gulf.

As authorities ponder, communities like Khun Samut Chin, 12 miles from downtown Bangkok, are taking action.

The five monks at the temple and surrounding villagers are building the barriers from locally collected donations and planting mangrove trees to halt shoreline erosion.

The odds are against them. About half a mile of shoreline has already been lost over the past three decades, in large part due to the destruction of once-vast mangrove forests. The abbot, Somnuk Attipanyo, says about one-third of the village's original population was forced to move.

Endangered cities
Cities around the world are facing the danger of rising seas and other disasters related to climate change. Thirty-three cities are predicted to have at least 8 million people by 2015. According to studies by the United Nations and others, these 18 are among those considered to be highly vulnerable:
City Country
Dhaka Bangladesh
Buenos Aires Argentina
Rio de Janeiro Brazil
Shanghai, Tianjin China
Alexandria, Cairo Egypt
Mumbai, Calcutta India
Jakarta Indonesia
Tokyo, Osaka, Kobe Japan
Lagos Nigeria
Karachi Pakistan
Bangkok Thailand
New York, Los Angeles U.S.
Source: The Worldwatch Institute

Copyright © 2007 The Seattle Times Company

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