Some 4,000 millimetres (157.48 inches) pour down on Thailand in a year, most of it between June and December, but shoddy management of the nation's water supply is causing shortages as agriculture, households and industry increase their demands, experts warn.

Demand for water could nearly double within 20 years, from 190 million cubic metres (6.7 billion cubic feet) a year to 340 million cubic metresbillion cubic feet), one study at respected Mahidol University indicates.

Because rain doesn't fall evenly throughout the year, Thailand is also highly prone to drought. The just-ended dry season brought a drought that scorched 60 of the kingdom's 76 provinces.

To ease the problem, Prime Minister Thaksin Shinawatra said the military would drill 4,000 new drinking wells, and the government may ask its neighbours about diverting water from the Mekong river to help Thai farmers, a move which would require an agreement with China, Myanmar, Laos, Cambodia and Vietnam, which have also faced problems with drought

But such responses fail to address more pressing needs to change attitudes about water conservation, says environmental expert Kampanad Bhaktikul from Mahidol University.

What he describes as "a severe water shortage" has crept into Thailand over the last decade, with the public largely unaware, he tells AFP.

Drilling more wells is "the same as constructing a dam in the time of flood", he says, urging better water conservation.

"What we should do is long-term policy planning, a master plan of water resources development and management," Kampanad says.

People should be allowed more control over water resources in their home area, he says.

But letting local residents take charge of water in their neighbourhood is not so simple, argues Witoon Permpongsacharoen, who heads the lobby group Foundation for Ecological Recovery.

More than 100 rivers and basins criss-cross the country, but for the past century the Chao Praya river basin around Bangkok has dominated irrigation policy, Witoon said.

"This ignores each individual areas' characteristics," he says. "The solution of water management should be based on local conditions."

The royal irrigation department has drafted a new four-year national water management plan aimed at a fairer distribution to farmers, households and industry, the agency's chief Samart Chokkanapitark says.

The 200 billion baht (4.9 billion dollar) plan, which needs cabinet approval, covers 25 river basins and could be implemented from 2006.

The water supply problem is "serious", Samart says, because Thailand has enough water but not enough reservoirs and dams to collect it.

The department supplies an average 49,500 million cubic metres (1.7 billion cubic feet) of water annually, but some 67,230 million cubic metresbillion cubic feet) is demanded, Samart says.

To reduce the difference, the new plan calls for building dams and replacing leaky pipes, and urging farmers in some areas to replace rice crops with more water-efficient ones including corn or soya beans.

The scheme would also give locals a greater role in managing their water, and would increase Thais' water bills by adding on the cost of treating water. Bangkok residents currently only pay for the cost of using raw water.

Nationally, Thais use an average 200 litres (42.8 gallons) of water per person a day, and 416 litres (109.9 gallons) per person in the Bangkok metropolitan area, Mahidol University's Kampanad says.

The figure for the city of more than seven million people and its surrounding districts includes water used domestically and by industry, Kampanad says.

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