Viru-Peipsi veemajanduskava - Keskkonnaministeerium

4.1 Põhjaveekogumite üldiseloomustus
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4.1 General description of groundwater bodies
Table 4.1. General description of groundwater bodies in the Viru-Peipsi district
Groundwater body Geological bedrock Consumption Chemical status
(area within the Viru-Peipsi (aquifers); hydraulic
catchment area, km 2 ) conductivity (m/d)
Quaternarian Vasavere Fluvioglacial sands- Consumed in Ahtme and High content of Fe and NH 4,
groundwater body gravels; 1–20 Jõhvi. Up to 25% of the low pH and high
(80) stock is being consumed; permanganate oxidation
groundwater body is
value refer to the impact
endangered by mining of the surrounding mires.
activities.
Infiltration of mine water into
the groundwater body is
possible (in 5.7% of the bore
wells studied, SO 4
content
exceeded 250 mg/l).
Quaternarian Meltsiveski 50% of the stock being Varying water quality, relatively
groundwater body consumed in Tartu. high NO 3
content (24.2 mg/l).
(8.7) Dangerous substances have been
found in a few samples. The
present sanitary protection zone
does not ensure the preservation
of water quality in future;
groundwater body vulnerable;
longer-term planning of water
supply constitutes a risk for the
water company because
preservation of water quality
will require unreasonably
big investments in future.
Quaternarian aggregated Water intakes of smaller High Fe content. NH 4
content
groundwater body (325.2): towns and settlements exceeds the standard for
Sadala area (55.6) (Elva, Võru, a.o.); 10–50% drinking water in 13% of the
Laiuse area (56,1) of the stock in use studied wells for unclear
Saadjärve area (80.7)
reasons (either local pollution
Elva area (7.4)
pollution or anaerobic
Piigaste-Kanepi area (39.6)
environment).
Võru area (76.1)
Upper Devonian Upper Devonian Main source of drinking Low vulnerability and good
groundwater body karsted and fissured water in Meremäe and chemical status. Average content
(285) dolomites and Misso municipalities. of Fe (0.61 mg/l) lower than in
limestones; 1–50 Appr. 10% of the stock other Devonian groundwater
in use
bodies.
Middle Devonian Middle Devonian Thousands of bore wells Low vulnerability, NH 4
content
groundwater body sandstones and located to the south exceeds the standard for drinking
(6444) aleurolites; 1–3 of the Viljandi-Tartu- water (0.5 mg/l), which is
Kallaste line. Bigger central probably due to anaerobic
water intakes in Põlva, environment in the groundwater
Tartu and Võru. Appr 10% body, i.e. not due to
of the stock in use
groundwater pollution.
Middle Lower Devonian Sandstones and aleurolites One of South Estonia’s Low vulnerability, meets the
groundwater body (5749) of Pärnu (D 2
pr), Rezekne most water-rich sources requirements of drinking water,