1. Mika Marttunen Anne-Marie Hagman
Multicriteria decision analyses with Web-HIPRE in lake restoration projects
Mika Marttunen
Anne-Marie Hagman

2. Backround
Several thousand lakes needs restoration. Hundreds of iniatives of restoration projects to the Regional Environment Centers
Need to create a method which provides a systematic and transparent way to prioritize these initiatives and to identify those lakes which need restoration and where opportunities for the successful outcome are highest.
A multi-criteria decision analysis approach is currently being developed in the Finnish Environment Institute for the systematic comparison of the lakes.

3. Main phases:
1. Choosing the objectives and attributes for the comparison. Two main value trees have been developed for that
- State of the lake
- Recreational and nature values of the lake
2. Assessing the performance of each lake in respect to each attribute
3. Defining the relative importance of the attributes
4. Calculating priorities for each lake by using Web-HIPRE model
5. Analysing the results and drawing diagrams and other figures

4. Testing Web-HIPRE-model in the Mäntsälä community
Preliminary results of 6 lakes are presented here
Recreational and nature values and ecological status of each lake has been calculated with the Web-HIPRE-model
Two priority values for each lake
Plotting these priorities helps to analyse the differences in the status and the use of the lakes

5. Assessment of status of the lake
A simplified example of the value-tree used in the analysis
Assessment of status of the lake
goal
objectives
Water quality
Macrophytes
Fishstock
species
coverage
Catch/ area
CPUE
Tot.P
Chlor-a
criteria
alternatives
Lake 3
Lake 1
Lake 2

6. Weights of the criteria in defining state of lakes in Mäntsälä:
Ranking
Points
Normalized weight
Water quality 1
100
0,23
Macrophytes 3 80
0,18
Sediment
Blooms of algae 2
Fishstock
The most important criterion in this assessment has got 100 points, others 100 or less depending on their relative importance compared to the best one.

7. Fish stock kirjoitetaan erikseen!
The priority values for the ecological status of Mäntsälä lakes. The higher the priority value the poorer is the condition.
Fish stock kirjoitetaan erikseen!

8. The priority values for the recreational use of Mäntsälä lakes
The priority values for the recreational use of Mäntsälä lakes. The higher the value, the higher is the use of lake.

9. The result of the analyses:
Comparison of Mäntsälä lakes with respect to recreational use and state
High need for restoration
No need for restoration