Water Quality in Slovenia - Agencija RS za okolje
Water Quality in Slovenia - Agencija RS za okolje
Water Quality in Slovenia - Agencija RS za okolje
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30<br />
W A T E R Q U A L I T Y I N S L O V E N I A<br />
The trophic status of lakes and reservoirs evaluated on the basis of OECD criteria (Organisation for<br />
Economic Co-operation and Development) (33) is presented <strong>in</strong> Table 6. The same criteria were used<br />
<strong>in</strong> the evaluation of the status of river <strong>in</strong> the bloom<strong>in</strong>g period, and the presented values are the<br />
average measured values at <strong>in</strong>dividual depths. The exception is the Moste reservoir where sampl<strong>in</strong>g<br />
was carried out four times a year.<br />
Table 6: OECD criteria for the evaluation of the trophic status (33) and the evaluation of lakes/reservoirs <strong>in</strong> the years 2003<br />
to 2006<br />
Trophic level<br />
Total<br />
phosphorus<br />
(average)<br />
OECD CRITERIA<br />
Nitrogen<br />
<strong>in</strong>organic<br />
(average)<br />
Transparency<br />
(average)<br />
Transparency<br />
(m<strong>in</strong>imum)<br />
Chlorophyll-a<br />
(average)<br />
Chlorophyll-a<br />
(maksimum)<br />
STATUS of the lake (µg P/L) (µg N/L) (m) (m) (µg/L) (µg/L)<br />
Ultraoligotrophic < 4 < 200 > 12 > 6 < 1 < 2.5<br />
Oligotrophic < 10 200 - 400 > 6 > 3 < 2.5 < 8<br />
Mesotrophic 10 - 35 300 - 650 6 - 3 3 - 1.5 2.5 - 8 8 - 25<br />
Eutrophic 35 - 100 500 - 1500 3 - 1.5 1.5 - 0.7 8 - 25 25 -75<br />
Hypereutrophic > 100 > 1500 < 1.5 < 0.7 > 25 > 75<br />
Lake and period of status<br />
evaluation<br />
Total<br />
phosporous<br />
Nitrogen<br />
<strong>in</strong>organic<br />
Transparency Transparency Chlorophyll-a Chlorophyll-a<br />
(µg P/L) (µg N/L) (m) (m) (µg/L) (µg/L)<br />
NATURAL LAKES<br />
Lake Bled 1979 - 1981 72 650 1.9 1.2 17 > 75<br />
Lake Bled 2003 - 2006 13 287 6.7 3.6 5.0 18.2<br />
Lake Boh<strong>in</strong>j 2003 - 2006 4 456 9.5 6.2 1.1 3.4<br />
ARTIFICIAL LAKE<br />
Velenje Lake 2006 120 1500 7.4 6.5 1.4 7.6<br />
RESERVOI<strong>RS</strong><br />
Šmart<strong>in</strong>sko Lake 2003 - 2006 63 758 1.2 0.8 17.3 46.4<br />
Slivniško Lake 2004 - 2005 140 1340 1.1 1.0 21.9 62.9<br />
Perniško Lake 2004 - 2006 133 1707 0.3 0.2 98.2 206.1<br />
Ledavsko Lake 2003 - 2006 136 2194 0.6 0.4 70.2 176.2<br />
Gajševsko Lake 2006 101 1329 0.8 0.5 37.6 61.8<br />
Klivnik 2003-2005 12 870 3.3 2.6 3.7 6.5<br />
Molja 2003-2005 17 595 2.2 1.6 7.5 17.9<br />
Vogršček 2006 8 890 3.2 2.7 4.4 12.3<br />
RIVER ACCUMULATION<br />
Moste 2006 32 802 5.4 2.6 2.0 3.7<br />
Mavčiče 2003 * 152 827 - 0.2 238.7 1306.1<br />
Vrhovo 2003 * 239 1258 - 0.7 71.0 180<br />
Ptujsko j. 2003 * 183 1182 - 1 4.8 6.6<br />
* Results of one sampl<strong>in</strong>g dur<strong>in</strong>g the bloom<strong>in</strong>g period