Typology, reference conditions for surface waters

1
Typology, reference conditions for surface waters
Aldona Margeriene
2
TypologySelection of system A or B

• The typology for rivers was done choosing system
  A and additional using slope from system B.
• The typology for coastal and transitional waters
  also was done choosing system A, using water
  mixing, wave exposure, dominant sediment type
  from system B.
• The typology for lakes was done choosing only
  system A, because of lack of knowledge and data.

3
Typology for rivers

• Rivers are divided into 4 classes according to
  the size of the catchment's area. Rivers with
  catchment's areas lt10 km2 are included in the
  group of rivers with catchments lt 100 km2
• .

4
Figure 2. Thematic map of river types.
5

• Typology for lakes

6
Figure 3. Thematic map with lake, coastal and
transitional water types
7
To one type by these parameters
Type specific reference conditions

• Height above sea level (all water bodies)
• Geological basement (rivers and lakes)
• Surface area (lakes)

8
Proposed reference chemical values for all river
types
9
Biological reference conditions for rivers

• Biological reference conditions for Lithuanian
  rivers in relation to WFD requirements cannot be
  established based on the current monitoring data.
  
• There is proposal to use a DFSI value of 6 or 7
  as the main criteria of reference condition

10
Good status for rivers (Danish proposal)

• BOD7 lt 3.0 mg/l and
• Ammonium-N lt 0.2 mg/l.
• DSFI will give index values from 1-7. It is
  proposed generally to relate the WFD quality
  classes to the fauna index values as follows
• High status Index 6 or 7
• Good status Index 5
• Moderate status Index 4
• Poor status Index 3
• Bad status Index 1 or 2.

11
Reference conditions for lakes(Danish proposal)
12
Good status for lakes (Danish proposal)
13
Reference conditions for lakes
14
Old rivers and lakes monitoring network
15

• The new Lithuanian State Environmental
  Monitoring Programme for the period 2005-2010
  has been approved in 2005.
• The new water monitoring programme is structured
  according to
• WFD requirements
• additionally Nitrate, Fish, Dangerous Substances
  Directives, Information Exchange Decision, HELCOM
  requirements
• national purposes.

16
Rivers monitoring network
17
River monitoring
18
Lakes monitoring network
19
Lakes monitoring
20
Biological parameters

• Macroinvertebrates (species composition, stream
  biotic index)
• Phytoplankton (species composition, biomas,
  abundance, abundance of species )
• Macrophytes (abundance, species composition)
• Fish (species composition, abundance, biomas)

21
Hydromorfological parameters

• Hydrological regime
• Connection to groundwaters
• Morphological conditions
• Hydromorphological index
• Lake morphometrics
• River continuity
• Mapping of dams that impend migration of aquatic
  fauna

22
General physico-chemical parameters

• Oxygen concentration
• Temperature
• BOD7
• pH
• Suspended solids
• P total
• N total

• Colour (as Pt mg/l)
• TOC
• Fe
• Ca
• NH4-N
• Conductivity
• Alkalinity

23
Dissolved nutrientsNO3-NNO2-NPO4-P

• Nutrients in
• lakes
• sediments
• P total
• dry weight
• organic matter

• Major ions
• Cl
• SO4
• Na
• K
• Mg
• Si

24
Thank You for Your attention!