Abstract
To manage and conserve ecosystems in a more sustainable way, it is important to identify the importance of the ecosystem services they provide and understand the connection between natural and socio-economic systems. Historically, streams have been an underrated part of the urban environment. Many of them have been straightened and often channelized under pressure of urbanization. However, little knowledge exists concerning the economic value of stream restoration or the value of the improved ecosystem services. We used the contingent valuation method to assess the social acceptability of a policy-level water management plan in the city of Helsinki, Finland, and the values placed on improvements in a set of ecosystem services, accounting for preference uncertainty. According to our study, the action plan would provide high returns on restoration investments, since the benefit–cost ratio was 15–37. Moreover, seventy-two percent of the respondents willing to pay for stream restoration chose “I want to conserve streams as a part of urban nature for future generations” as the most motivating reason. Our study indicates that the water management plan for urban streams in Helsinki has strong public support. If better marketed to the population within the watershed, the future projects could be partly funded by the local residents, making the projects easier to accomplish. The results of this study can be used in planning, management and decision making related to small urban watercourses.
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Acknowledgments
The authors would like to thank Professor Janne Kotiaho (University of Jyväskylä) and senior researcher Heli Saarikoski (Finnish Environment Institute) for their detailed comments and advice concerning the manuscript. We also thank project manager Päivi Islander and city engineer Raimo K. Saarinen (City of Helsinki) for their good co-operation in the planning and implementation of the study, and Elina Seppälä (Pohjois-Satakunnan peruspalvelukuntayhtymä) and Jukka Jormola (Finnish Environment institute) for their contribution to the study and this manuscript. In addition, we are grateful to our colleagues for testing the questionnaire and to all our respondents, whose valuable effort made this study possible. This work has been funded by the Finnish Ministries of the Environment and Agriculture and Forestry, the Finnish Environment Institute, and the City of Helsinki.
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Appendix 1
Appendix 1
Description of the state of Helsinki streams in the questionnaire if the measures mentioned in the Small Water Action Plan are not implemented
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The streams will frequently flood during heavy rains, but during the dry season the channels may dry out.
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Water quality will be poor, especially during floods.
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The streams will only support a few habitats, and sea-running brown trout populations may go extinct.
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Storm waters and bank erosion will continue to increase water turbidity. The streams will be dredged into straight, deep and uniform channels. Stones and large woody debris will be removed from the streams.
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The surroundings of the streams will only be taken care of in parks. In other places, bushes and other dense vegetation will grow, limiting recreational opportunities in the area.
Wording of the valuation scenario in the CV questionnaire
Below, we provide some background information on the following questions related to the hypothetical Small Water Fund.
The City of Helsinki, the Finnish environmental administration, and several NGOs have been restoring some streams in Helsinki during the past few years. However, holistic, basin-level improvement of the ecological state of the city’s streams requires more effective and long-term water protection actions. These actions will increase the cost of restoration, and at present there are insufficient resources to carry out the actions. One further step listed in the Small Water Action Plan for Helsinki was to explore new funding mechanisms to enable future implementation of the Action Plan.
One possibility to improve the ecological state of small waters in Helsinki is to establish a Small Water Fund to finance the restoration. The City of Helsinki would be one of the contributors, but citizens, private organizations, and NGOs would also be able to support the fund. The fund would be established in 2011, and its first term would be five years, lasting until 2015.
According to the Helsinki Water Vision 2015 introduced in the Action Plan, Helsinki will in the future have a diverse network of streams and other small waters, increasing biodiversity and attracting citizens and wildlife. The Helsinki Small Water Fund would finance the restoration of 25 streams, six ponds, five bogs, and six springs that are listed in the Action Plan. After the restoration:
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Storm waters will be filtered through soil, infiltration areas, or wetlands before they are directed to the streams;
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Flood protection of the streams will be improved with flood terraces;
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Streams will meander and the sound of the flowing water will return to the city. The streams will maintain a high biodiversity and their water flow will be more even, so that even during dry periods they will provide water;
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Stones and large wood debris will make the flow more diverse and provide shelter and habitats to fauna and flora;
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Streams and their corridors will provide habitats for various birds, mammals, and insects. Sea-running brown trout populations will continue to return to restored streams;
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Streams will be more visible and audible in the landscape;
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There will be stepping-stones, benches, and bins along the streams to attract citizens to outdoor activities, so that they can enjoy nature, or simply relax by the water.
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Sarvilinna, A., Lehtoranta, V. & Hjerppe, T. Are Urban Stream Restoration Plans Worth Implementing?. Environmental Management 59, 10–20 (2017). https://doi.org/10.1007/s00267-016-0778-z
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DOI: https://doi.org/10.1007/s00267-016-0778-z