RAZAKAR, LIAR & TADER SUPPORTER DER
DUI GALE
JUTA MARO BARE BARE
***
RAZAKAR, LIAR & TADER SUPPORTER DER
DUI GALE
JUTA MARO TALE TALE
On 3/27/08, Salahuddin Ayubi <s_ayubi786@yahoo.com > wrote:
Our media is only seeing the ground water depletion.
What they can not see is the future Dhaka. the rate at
which Dhaka is growing, it will soon be the dumping
ground of garbages of the whole country. If Dhaka has
to survive as a city then we have to stop its further
growth. As first stem we must shift the capital to
somewhere in the norht Bengal. Otherwise the Citizens
living in Dhaka will soon be living in a supersize
dustbin.
Salahuddin Ayubi____________
--- Isha Khan <bd_mailer@yahoo.com > wrote:
> Dhaka sits on big hollow:Groundwater level drops 3
> metres a year; collapse in surface feared as
> aquifers not recharged adequately
>
>
>
>
>
> Groundwater table in the capital has dropped down
> to 61.18 metres below the surface, 35 metres in the
> last eleven years, due to lack of recharging which
> has put the sprawling metropolis at great risk.
>
> In 1996 the groundwater table was only 26.6 metres
> bellow the surface. But it went 61.18 metres below
> in 2007, declining at the rate of over three metres
> on average every year.
>
> Experts say as an increasing number of city people
> cannot use surface water due to consequent
> pollution, pressures on groundwater have increased,
> resulting in declination of water table.
>
> "If water table continues to fall then a vacuum will
> be created in the aquifer which could cause a sudden
> collapse in the surface," said Khandakar Fazal
> Hasan, chief geologist of Bangladesh Agricultural
> Development Corporation (BADC). "In Bangkok city it
> happened due to over extraction of groundwater," he
> warned.
>
> A study undertaken by BADC recently has pointed this
> sharp drop in groundwater level in Dhaka
> city.According to the study, Dhaka's groundwater
> level was 59.72 metres below in 2006, 57.42 metres
> in 2005, 50.6 metres in 2004, and 46.24 metres in
> 2003.
>
> The water table in Dhaka was on average 42 metres
> below the surface in 2002, 37.78 metres in 2001,
> 34.18 metres in 2000, 31.86 metres in 1999, 30.45
> metres in 1998, 28.15 metres in 1997 and 26.6 metres
> in 1996.The study was carried out with a vertical
> automatic water level recorder, which is now the
> most accepted method of verifying water level.
>
> Quoting a Wasa report, officials said underground
> water table was on average 11.3 metres below the
> surface in the 1970s and 20 metres in the 1980s.
>
> The experts say the decline is occurring fast side
> by side with the increase of population. Demand for
> water in the capital, fifth largest city in the
> world with a population of over 12 million, is now
> more than 2,000 million litres per day (mld) which
> was 1,500 mld in 1998, Wasa sources said.
>
> The three water treatment plants provide with uneven
> amounts -- Sayedabad supplies 225 million litres,
> Chadnighat 39 million litres and Narayanganj 46
> million litres. The remaining has to be extracted
> from groundwater sources.
>
> The experts say withdrawal of groundwater by deep
> tube-wells is a major reason for fall in the table.
> In 1998, the number of deep tube-wells was 234,
> which now stands over 400.
>
> The number is actually much higher as the owners of
> almost all the high-rises have installed deep
> tube-wells, a top official of Wasa (Dhaka Water and
> Sewerage Authority) said seeking not be named.
> Sources say Wasa's two treatment plants can meet
> only 20 percent of the city's demand by treating the
> surface water. The rest is met by deep tube-wells.
>
> Based on their statistics, Wasa officials say water
> level has drastically fallen since 1996 in almost
> all parts of the city including Mirpur, Dhaka
> Cantonment, Dhanmondi, Mohammadpur and Old Dhaka.
>
> Department of Environment sources say concentration
> of heavy metal including cadmium, lead, mercury,
> chromium and aluminium in rivers around Dhaka is
> increasing day by day. Improper application of
> pesticides and disposal of industrial waste are also
> adding to the pollution.
>
> Pollution has already made the surface water of
> Dhanmondi, Gulshan-Baridhara and Ramna lakes
> unusable."Declining groundwater level will greatly
> increase the risks during earthquakes. It could lead
> to subsidence of the clay soil plate Dhaka is
> situated on," said Khandakar Fazal Hasan.
>
> Asked about possible remedial actions, he said
> wetlands and water bodies should be preserved to
> recharge the groundwater level. "It's not possible
> for us to decrease withdrawal of groundwater as
> treating surface water in full volume is not
> possible due to contamination. So we should go for
> groundwater recharging," he noted.
>
> Over the years, different real estate businesses
> have encroached on open space, lakes and rivers,
> barring full recharging of groundwater in the
> monsoons.
>
> http://www.thedailystar.net/ story.php? nid=29341
>
>
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