DOI: 10.5281/zenodo.6855357
title: H2020 773782-COASTAL MAL03 Management set for the Norrström-Baltic region

description: The sets of measures relate to different Business Road Map (BRM) alternatives prioritized by stakeholders in the Norrström-Baltic (MAL3) case: <strong>Current management</strong>: Base case with no change in nutrient concentrations for nitrogen (N) and phosphorous (P) (same results as for the base case scenario in D19). <strong>Agricultural set of measures</strong>: Considers the example of 25% reduction in nutrient concentrations leaching from currently active agriculture with associated reduction in agricultural nutrient contributions to subsurface water (SSW) and surface water (SW) nutrient concentrations. Such reductions may result, e.g., from improved/optimized agricultural fertilization practices and drainage facilities, and restoration/construction of wetlands that can capture local nutrient leakage. This set of measures relates to the stakeholder-prioritized BRM alternative “Integrated risk assessment of nutrient losses from agricultural soils to surface waters”. <strong>WWTP set of measures</strong>: Considers the example of 25% reduction of nutrient concentrations in discharges from currently active municipal and industrial wastewater treatment plants (WWTPs) and unconnected wastewater facilities with associated reduction in their contributions to SW nutrient concentrations. Such reductions may result, e.g., from improved nutrient removal in WWTPs and recovery in smart water and sanitation systems, related to technological advancements and, more widely, e.g., creation of a nutrient market that makes such capture and reuse worthwhile. This set of measures relates to the stakeholder-prioritized BRM alternatives “Nutrient recovery in wastewater treatment plants” and “Smart water and sanitation systems”. <strong>Legacy set of measures</strong>: Considers the example of 25% reduction in total SSW and SW nutrient concentrations. Such reductions may result from catchment-wide mitigation (removal/capture and possible reuse) of nutrients released from diffuse wide-spread legacy sources that still remain in soil, groundwater and sediments from different types of earlier nutrient inputs (past agricultural leakage, municipal and industrial wastewater discharges). Such mitigation may be achieved, e.g., by restoration/construction of wetlands and construction of reactive barriers that are well-placed and distributed to effectively capture considerable parts of the overall legacy nutrient releases throughout each hydrological catchment. This set of measures also relates to possible changes in socio-economic drivers, such as creation of a nutrient market that can make capture and reuse of nutrients worthwhile, along with improved knowledge transfer between sectors and some shift in the municipal water (quality) management monopoly that current applies in Sweden. With regard to the stakeholder-prioritized BRM alternatives, it relates to: (i) “Improved knowledge transfer between sectors” that may drive better system understanding with more efficient nutrient mitigation measures taken and well/optimally placed in each hydrological catchment for targeting and mitigating diffuse legacy sources; and (ii) “Change of municipal monopoly” that may enhance collaboration and communication between different municipalities within the same hydrological catchment toward more overarching efficiency and circular principles on whole catchment-scale. The .xslx data are organized as follows. One sheet per set of measure: Base case (current management) Agricultural set of measures Wastewater treatment plants set of measures Legacy set of measures For each sheet, the following data are included. Columns: <strong>A: Variable name</strong> <strong>B: Input variables</strong> - full name and units of the variable <strong>C: Initial</strong> <strong>D: current climate and socio-economy</strong> <strong>E: scenarios</strong>: RCP4.5+SSP1, RCP4.5+SSP2, RCP4.5+SSP4, RCP4.5+SSP5 For each column, the values are organized with the following variables (rows 2-16): “Concentration of N in SSW”, “Concentration of N in SW”, "Concentration of N in WWTP-input", "Concentration of N in WWTP-output", “Concentration of P in SSW”, “Concentration of P in SW”, "Concentration of P in WWTP-input", "Concentration of P in WWTP-output", "Concentration of P-SW to agriculture", "Concentration of N-SW to agriculture", "Concentration of P-agriculture to SW", "Concentration of N-agriculture to SW", "Concentration of N-agriculture to SSW", "Concentration of P-agriculture to SSW"