Conference Agenda
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Daily Overview |
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SES 3-3-3: Combat Location: HSB2 Session Chair: Martin Oberascher Session Chair: Robert Sitzenfrei | |
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2:21pm - 2:33pm
Allocation of Nature-Based Solutions Using Benefit-Cost Ratios and Spatial Flow Metrics Institute of Urban Water Management, Graz University of Technology, Graz, Austria Our approach begins by exploring various LID implementations and combinations at the individual subcatchment (SC) level. Performance is evaluated using peak runoff and evapotranspiration (ET). Using the gained knowledge, cost-efficient and inefficient configurations for each SC are identified, by varying the implementation area for green and road LIDs. Efficiency is assessed based on achieved peak runoff reduction or ET increase per euro of investment for the investigated configurations. This produces a catalogue of viable configurations and reduces the range of possible solutions significantly. To identify good global arrangements, suitable LID types and strategies for their placements are identified for each objective. The budget is distributed to optimize the biodiversity objective. For flood reduction, flooding nodes are identified in the reference scenario. LIDs are then placed in the vicinity of the identified flooding nodes. To reduce CSO volume and loading, LIDs are placed based on the estimated flow duration of each SC to the CSO, targeting SCs, that contribute to peak flow. Finally, leveraging this knowledge, we conduct event-scale simulations with random variations of implementations, using Pareto optimization to evaluate multi-criteria performance indicators. The variant with the best overall performance is then selected. | |