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Guidelines for the compilation for waterborne pollution load to the Baltic Sea (PLC-Water) 

HELCOM 26 by adopting HELCOM Recommendation 26/2 “Compilation of Waterborne

Pollution Load (PLC-Water)” decided that the waterborne pollution load compilations will be

carried out in two phases:

  1. Total waterborne loads (rivers, unmonitored and coastal areas as well as point sources

    and diffuse sources discharging directly to the Baltic Sea) of nutrients and hazardous

    substances are reported to HELCOM annually and assessed as annual Indicator reports,


  2. Comprehensive Waterborne Pollution Load Compilations quantifying waterborne discharges

    from point sources and losses from non-point pollution sources as well as natural

    background losses into inland surface waters within the catchment area of the Baltic Sea

    located within the borders of the Contracting Parties are reported to HELCOM every sixth

    year starting in 2006.

These pollution load compilations should be carried out in accordance with the valid

Guidelines for the Waterborne Pollution Load Compilation.

The Guidelines (updated 2 February 2006) can by downloaded as one pdf file or by chapter:

  1. General Information

  2. Load-orientated approach: Quantification of total load to the Baltic Sea, retention and riverine load apportionment

  3. Source-orientated approach: Methodology for assessing point and diffuse sources and natural background losses

  4. Quality Assurance

  5. References

Annex 1: Method 1 - Nutrient mass balance models for river systems, a German approach

Annex 2: Method 2 - Nutrient mass balance models for Lakes, a Danish approach

Annex 3: Method 3 - Nutrient transport and transformation (retention), the Swedish approach

Annex 4: Reporting format for the quantification and reporting obligations

Annex 5: Categories of industrial activities referred in Annex 1 of the IPPC Directive


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