Economic value of urban fluvial environments

The reservation of spaces for the safeguard and/or rehabilitation of ecosystems in general and fluvial ecosystems in particular is especially laborious and costly in consolidated urban areas. Although it is true that in the last few decades almost nobody has questioned the favorable implications that the preservation and improvement of the environment has on people's quality of life, it is also true that in almost all decision-making models these aspects receive a "qualitative" treatment that somehow impairs an integrated economic analysis. The exposition made in this article aims to quantify, in economic terms, aspects such as the conservation of natural spaces, landscaping improvements, recreational and teaching activities, the rehabilitation of native wildlife, etc, despite the fact that they-although considered undeniable economic commodities-have no venal value. The model presented here, based on a classical cost/benefit analysis, intends to be an assessment of rehabilitation and strengthening efforts in the fluvial environment of the Arga River, as it runs through the city of Pamplona, based on its main associated aspects: reassessment of housing in the surroundings of the river, increase of the attraction potential for recreational purposes, improvement of the landscape, increase of the self-purification phenomenon of the river, and existence value as an altruistic response citizens who increasingly value the preservation of nature, the habitability of cities, and their integration to natural surroundings.