Viru-Peipsi veemajanduskava - Keskkonnaministeerium

4.1 Põhjaveekogumite üldiseloomustus
81
4.1 General description of groundwater bodies
Põltsamaa. Appr. 10%
of the stock in use.
due to the influence of mire areas.
Wells exceeding the drinking
water standards are nearly twice
less abundant in the Viru part
than in the Peipsi part thanks to
dilution of pollutants due to
higher infiltration rate of
precipitation water.
Ordovician-Cambrian Sandstones and Very important for Confined groundwater not
groundwater body aleurolites of Lower water management. vulnerable to pollution. NH 4
(12150) Ordovician Pakerort In addition to hundreds concentration exceeds the
horizon (O 1
pk) and of wells in sparsely drinking water standard in
Cambrian formations; populated areas, the 12.9% of wells due to
1–5 water is consumed also anaerobic environment of the
by the towns of Kadrina, groundwater body. In Tartu,
Rakvere, Kiviõli, Tamsalu O-Cm water should be mixed
and Tartu. 10–20% of with the water of overlying
the stock being consumed. aquifers in order to reduce the
Crosses the national
natural high content of Na and Cl.
border in Ida-Viru county The high SO 4
concentration (over
and is thus influenced by 250 mg/l) in some wells of
water consumption both, Kiviõli and Kohtla-Järve is
in Estonia and in Russia. probably caused by infiltration
Could be regarded as of water from the SO 4
-rich
an international ground- Ordovician groundwater body
water body due to
of Ida-Viru oil shale basin into
transboundary impact. O-Cm groundwater.
Cambrian-Vendian Sandstones and Very important for Confined groundwater not
Voronka groundwater aleurolites of Voronka water management. vulnerable to pollution. NH 4
body (5475 in (V 2
vr) and partly In addition to hundreds concentration is caused by
terrestrial areas) also Lontova (ª 1
ln) of wells in sparsely anaerobic environment. The
formations; populated areas, there biggest threat is possible
2–5 are water intakes in intrusion of sea water into
almost all towns and
water intakes located near the
settlements of Ida-Viru Gulf of Finland, but also
County. In coastal areas connection with the chlorideoften
the only groundwater rich Gdov groundwater body
body usable for public through some bore wells.
Cambrian-Vendian Sandstones and water supply. Use is limited Confined groundwater not
Gdov groundwater aleurolites of Gdov by lower quality of the vulnerable to pollution. Naturally
body (3621in (V 2
gd) formation; influent (intrusion of salt high Cl and Na concentration
terrestrial areas) 5–8 water). 60–80% of the stock and effective dose, in 24% of
in use. The Voronka ground- wells NH 4
>0,5 mg/l. Reasons:
water body crosses the anaerobic environment and
national border, thus it is specific natural features of
influenced by water use Cm-V groundwater in all of
both, in Estonia and in North Estonia.
Russia and should be
Chloride concentrations do not
regarded as an
meet the drinking water
international ground-
standards and the water needs
water body.
to be diluted with water from
the Vasavere groundwater body
prior to its use as drinking water.
Recommended to use only as
technical water in future.