8/8/2019 German Risk Assessment

1/13

2008

Implementation of the WaterFramework Directive in Croatia

Twinning Project

German methodology and results of the

integrated risk assessment

Sandra Richter

8/8/2019 German Risk Assessment

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2008

Implementation of the WaterFramework Directive in Croatia

Twinning Project

In general

Starting point in Germany:

Guidelines on the Community (CIS): Guideline for the Analysis ofPressures and Impacts

Guidelines on Member state level by the LAWA (German Working

Group of the Federal States on water issues)

8/8/2019 German Risk Assessment

3/13

2008

Implementation of the WaterFramework Directive in Croatia

Twinning Project

Assessment of water bodies according to the following categories

Water bodies that are likely to achieve good status (not at risk offailing to achieve the WFD objectives)

Water bodies that may fail to achieve good status (possibly atrisk of failing to achieve the WFD objectives).

Water bodies that are unlikely to achieve good status (at risk offailing to achieve the WFD objectives).

8/8/2019 German Risk Assessment

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2008

Implementation of the WaterFramework Directive in Croatia

Twinning Project

1. Compilation of relevant information for every water body

If available: biological data and data on specific pollutants

Lack of biological data, assessment methods not established Use of criteria basing on existing information and

measurements: supporting elements as water body

morphology, river continuity, physico-chemical conditions

2. Parameter specific risk-assessment

3. Integrated risk-assessment on water body level

Integrated risk assessment

8/8/2019 German Risk Assessment

5/13

2008

Implementation of the WaterFramework Directive in Croatia

Twinning Project

German parameters to assess the likelihood of achievingthe objectives different according to water category

Risk-assessment of rivers: Saprobic index (pressure on oxygen balance)

Water body morphology

River continuity

General physico-chemical conditions

Specific pollutants

Risk-assessment of lakes:

Trophic status

River bank morphology

Specific pollutants

Class IIClass II-IIIClass > = III

All categories of water: Pollutants to assess chemical status

8/8/2019 German Risk Assessment

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2008

Implementation of the WaterFramework Directive in Croatia

Twinning Project

Aggregation of results: Saprobic index and River morphology

?

Likelihood of failingto achieve

the objectives

Percentageof water body

length

Not achieved

Not achieved

Not achieved

Criteria

< 30 %

30 - 70 %

> 70 %

not at risk

possibly at risk

at risk

Significantly changedmorphology

Saprobic status > class II

Morphology slightly changed

8/8/2019 German Risk Assessment

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2008

Implementation of the WaterFramework Directive in Croatia

Twinning Project

Specificpollutants

Migrationbarriers

Generalphysico-chemical

substances

Waterqualityclass

(saprobic

index)

Hydromor-phology

class

Waterbody

First risk analysis

Integrated risk assessment of relevant parameters; worst-case-scenario

not at risk

possibly at risk

at risk

8/8/2019 German Risk Assessment

8/13

2008

Implementation of the WaterFramework Directive in Croatia

Twinning Project

Example for the result of risk analysis in the German state HessenNumber ofwater body

Saprobicindex

Morphology

Generalphysico-chemical

conditions

Specificpollutants

Assessment of

ecologicalstatus

Overallassessment

Assessment ofchemical

status

Number ofbarriers

Parametersaccording to

Annex IX and X

8/8/2019 German Risk Assessment

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2008

Implementation of the WaterFramework Directive in Croatia

Twinning Project

One out all out

Phosphorous concentration

8/8/2019 German Risk Assessment

10/13

2008

Implementation of the WaterFramework Directive in Croatia

Twinning Project

Water body Emsbach in Hessen

Morphological valuablesectors

Significant barriers

River continuity inHessen:

Morphologicalvaluable sectors as

well as mainmigration waters

- 2650 physicalbarriers in Hessen

8/8/2019 German Risk Assessment

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2008

Implementation of the WaterFramework Directive in Croatia

Twinning Project

Assessment results for rivers and lakes in GermanyResult for 9.000 river water bodies resp. 130.000 km

Result for 800 lake water bodies including dams and artificial water bodies

8/8/2019 German Risk Assessment

12/13

2008

Implementation of the WaterFramework Directive in Croatia

Twinning Project

Causes for failing the objectives of German river water bodies

0

1000

2000

3000

4000

5000

Numberofw

aterbodies

Hydro-morphology

Physico-chemical

conditions

Saprobicindex

Chemicalstatus

Specificpollutants

Numberofwaterbodies

8/8/2019 German Risk Assessment

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2008

Implementation of the WaterFramework Directive in Croatia

Twinning Project

Conclusions of the integrated risk-analysis in Germany

Besides existing guidelines: in-site and expert knowledge are essential

basics for all parts of the inventory taking

Different data sources and different criteria: generalisation necessary

Suitable documentation to assure usability

Results from monitoring in Germany: 30/70-rule suited, eutrophication

problem, result of first risk-assessment rather to positive than realecological status

No assessment based only on single quality or supporting elements i

in case of insufficient data: water body possibly at risk