Water status of Plateliai lake,
tendency of water status
according to state monitoring data
Gustina Leiputė
2012.11.12
Environmental Protection Agency
http://gamta.lt
State monitoring in Plateliai lake
Since 1993.
2010-2017 – intensive surveillance
monitoring (every year).
Central part of the lake, surface layer.
2012.11.12
Environmental Protection Agency
http://gamta.lt
Status assessment since 2010
General status of the lake:
1. Ecological status
 Biological
- Chlorophyll „a“
 Physico-chemical
- Total nitrogen (N)
- Total phosphorus (P)
 Hydromorfological
- Changes in water level
- Changes in shore line
2. Chemical status
2012.11.12
Environmental Protection Agency
http://gamta.lt
Frequency and season
Chlorophyll „a“ – 6 times per year.
Physico-chemical – 7 times per year.
2012.11.12
Environmental Protection Agency
http://gamta.lt
Dissolved oxygen and BOD7 in
Plateliai lake
mg O2/l
Annual means of dissolved O2 and BOD7
13,0
12,0
11,0
10,0
9,0
8,0
7,0
6,0
5,0
4,0
3,0
2,0
1,0
0,0
1994 1995 1997 1998 2001 2002 2003 2004 2006 2007 2010 2011
Year
Dissolved O2
2012.11.12
BOD7
Environmental Protection Agency
http://gamta.lt
Nitrogen in Plateliai lake
mg/l
Annual mean of total N
0,800
0,700
0,600
0,500
0,400
0,300
0,200
0,100
0,000
1994
1997
1998
2001
2002
2003
2004
2005
2006
2007
2010
2011
Year
Total N
2012.11.12
Environmental Protection Agency
http://gamta.lt
Trends. Nitrate Directive
Trends in surface water NO3 concentrations
based on winter and annual average data, and
max value.
Comparison of 2004-2007 with 2008-2011.
Result – no evidence of change in status.
2012.11.12
Environmental Protection Agency
http://gamta.lt
Phosphorus in Plateliai lake
mg/l
Annual mean of total P
0,05
0,05
0,04
0,04
0,03
0,03
0,02
0,02
0,01
0,01
0,00
1994 1997 1998 2001 2002 2003 2004 2005 2006 2007 2010 2011
Year
Total P
2012.11.12
Environmental Protection Agency
http://gamta.lt
Chlorophyll “a” in Plateliai lake
Annual mean of chlorophyll "a"
8,0
7,0
6,0
5,0
4,0
3,0
2,0
1,0
0,0
1998 2001 2002 2003 2004 2006 2007 2010 2011
Year
Chlorophyll "a"
2012.11.12
Environmental Protection Agency
http://gamta.lt
Status of Plateliai lake
Year
Total N
Total P
Ecological
status
High
2010
High
Chlorophyll „a“
High
Total N
High
Total P
Chlorophyll „a“
2012.11.12
General status
2011
High
Good
Could not be
classified
Moderate
Environmental Protection Agency
http://gamta.lt
Thank you.
2012.11.12
Environmental Protection Agency
http://gamta.lt