VietNamNet
Bridge – The water monitoring results
show that the underground water resources have been decreasing in many places.
Meanwhile, the underground water has also got infected with ammonium and
arsenic, which is a big threat to local residents who cannot access the
national water supply system.
According
to Dr Nguyen Thi Ha from the Center of Water Resource Monitoring and
Forecasting under the Ministry of Natural Resources and the Environment
(MONRE), in the Northern Delta, the water levels at some monitored places,
including Mai Dich, Cau Giay in Hanoi, have decreased nearly to the allowed
limits.
In some
other areas of Hai Hau, Truc Ninh, Nam Dinh, Quynh Phu and Thai Binh, the
decreased water levels are still within the safety line. However, scientists
have warned that the aquifer has complicated hydrogeological conditions;
therefore, it is necessary to apply necessary measures to prevent the saltwater
intrusion caused by the water exploitation.
The
monitoring results showed that in the dry season, 17 out of 32 water samples
have manganese content higher than the allowed standards, four have the As
content higher than the allowed level. The highest As content was 0.1500mg/l,
or three times higher than the allowed level.
Meanwhile,
in rainy season, 12 out of 30 samples were found as having the manganese
content exceeding the allowed level, and 4 samples have As concentration higher
than the allowed level. Especially, all the 18 samples have the NH4+ much
higher than the allowed level.
In the
southern delta, in some monitored places, the water levels have dropped deeply
approaching to the allowed levels, especially in districts 1 and Binh Tan in
HCM City.
Only
the water quality in the Central Highlands remains relatively good which does
not show signs of the underground water pollution. The concentration of
microelements in the underground water can meet standards, except manganese.
13.4 percent of water samples in dry season and 4.35 percent of samples in
rainy season have the manganese concentrations higher than the allowed
standards.
Dr
Nguyen Thi Ha stressed that it is necessary to give warnings about the salinity
intrusion. The underground water being exploited is fresh water. However, the
aquifers above and under the exploited one are salt water. The overexploitation
may lead to the intrusion of the salt water into the fresh water aquifer.
To
date, in Vietnam, there has been no thorough research work about the salinity
intrusion into fresh water aquifers. However, scientists say it’s necessary to
give warnings about the possibility of fresh water turning salt water.
Dr Tran
Hong Con from the University of Natural Sciences under the Hanoi National
University said that the decrease of the underground water and the pollution
have been warned for a long time. However, all the measures applied so far
still cannot help improve the situation, while the water quality is getting
worse.
In
principle, underground water can recover itself, but the natural water recovery
would not be enough to satisfy the overly high demand. The water
overexploitation may lead to the earth sinking, and badly affect the quality of
underground water.
Experts
have pointed out that in order to prevent the underground water from “reaching
the bottom,” it is necessary to adjust the exploitation capacity. They have
also called on to strictly control the drilling of wells for water. Meanwhile,
there has been no regulation on the exploitation and the use of water from
drilled wells.
Source:
Bee.net
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