BINGO was presented in Badalona on June 13th in Espai Betúlia to around 60 participants.
The session started with the welcome address from the Badalona city council representatives (Rubén Guijarro, councillor of government and territory and Pep Montes, Head of Urban Ecology Department) and Aquatec representative (Montse Martinez, R+D+i coordinator). Then, the agenda of the day was presented followed, as an introduction to BINGO project, by the dissemination video specially produced for the Badalona case study.
After the welcome address, the first technical block was initiated with a general presentation of the main objectives of BINGO project and the specific challenges of the Badalona case study followed by a specific presentation on the importance of the Community of Practice (CoP) of Badalona in all the BINGO process.
After that, a detailed presentation on the climate change predictions and projections for Badalona was presented, including a general introduction of the climate change concept, the 5th IPCC report general results, the downscaling methodology and the climate change scenarios being considered through BINGO project and specifically for Badalona.
The second part of this first technical block included a detailed presentation on the first climate change impact being studied for Badalona: urban flooding. In this presentation, a detailed description of the methodology and results for the flood impact and risk assessment was performed. Including a description of the coupled urban drainage model 1D/2D being developed for Badalona, the field campaign being performed and the calibration procedure. Together with a detailed description of the results obtained for the flood impact and risk assessment, including the social and economic impacts on pedestrians, vehicles, buildings and businesses (indirect damages) and resulting in: flood risk maps for pedestrians and vehicles for current and future (CC) scenarios and the corresponding estimation of the damage costs (estimated annual damage) derived from such urban flooding episodes, also for current and future scenarios.
After this presentation, a first round of discussion was performed. Here, the main questions or comments that were arisen included:
- Question on the statistics used to estimate the corresponding return periods
- Recommendations in continue working in Badalona with the study of other climate change hazards such as the sea level rise.
- Particular questions about the high risk areas for small return periods
- Regarding damage estimation (for flooding), representatives of Diputació de Barcelona were interested in knowing, for example, the specific damage estimation for the public spaces they manage.
The discussion was followed by the coffee break were part of the discussion also continued.
After the coffee break, the second technical block was started addressing the second climate change impact analysed in Badalona: the combined sewer overflows (CSOs). The presentation included a description of the methodology and the main results. Regarding the methodology: the data acquisition procedure (on-line measurements and sampling campaigns), the risk definition for Badalona and the integrated urban drainage-marine model being developed, calibrated and used were presented. It was followed by a detailed description of the results: the CSO risk estimation after single rain events and per bathing season, for present and future scenarios, and the resulting curve estimating the duration of CSO pollution based on rain intensity as methodology for speeding up the local protocol on beaches closure/opening. The presentation was finished with a description of the methodology for direct (bathers and environment) and indirect (business) damages estimation due to the CSOs also for current and future scenarios.
The second part of this block included a description of the adaptation measures being defined for Badalona. It started with a description of the selection procedure through the CoP, explained how, from a list of 15 initial measures, 3 of them where finally selected to perform the 3 layer-framework assessment and the cost-benefit analysis (CBA): a set of structural measures, a set of SUDS (Sustainable Urban Drainage Systems) and an Early Warning System for flooding and CSO. The assessment of each adaptation measure at the Badalona case was performed following a double approach: the risk reduction (flood and CSO) associated to each measure and the cost benefit analysis of its implementation. Accordingly, a first block of results on the risk reduction associated to each measure (methodology and results) was presented including: the reduction on the high risk area for pedestrians and vehicles (in the case of flooding) and a reduction on the % of bathing season time with insufficient bathing water quality together with the annual CSO volume from wet weather periods (in the case of CSOs).
Afterwards, a specific presentation on the cost-benefit analysis including the methodology and results was presented. Regarding the methodology an explanation of the scenarios, hypothesis, impacts and elements being considered were presented, together with a detailed description on the direct and indirect damages estimation, including the intangible damages estimation for the CSOs. The presentation was finished with a depiction of the results of the CBA for each one of the 3 measures being considered for flooding and CSOs and for the current (do-nothing) scenario. Results of the CBA was depicted into: estimated annual damage, benefits, costs and net benefits. In the case of SUDS, the benefits were also classified into: EAD change, aesthetic value, urban heat island effect, habitat creation and air quality improvement.
The technical block 2 finished with a second round of discussion, where the main questions or comments addressed the following points:
- Recommendation to analyze CSO behavior in the sewer network through 3D modelling
- Robustness of project results related to few mm rain events (for CSOs)
- CBA useful tool to estimate the benefits of structural measures
- ACA (Catalan Water Agency) has historic exploitation and maintenance costs for structural measures that could share with us
- It would be interesting to have the efficiency (and CBA) of each structural measure and each SUDS separately to even prioritize within them
- Congrats for the useful double approach of risk reduction and CBA for the assessment of adaptation measures
- Interest in replicating the results of BINGO project at metropolitan area scale
The event finished with an exposition of the main conclusions and results (take-aways) for the case study.