Urban Flood Risk Mitigation model - Green infrastructures implementation

Hello everyone,

In relation to the Urban Flood Risk Mitigation model, since I work with different scenarios, I would like to know how you think to implement a green solution and include this in the model. I mean, if I imagine implementing a bio-swale, what I will have to change in the data input? I thought to the Hydrological curve numbers, but I would like to have your feedback on that because you have developed this model and of course you know the best way to do it.

Thank you.

Best regards,

A scenario using bioswales would be represented by changing the Land Use/Land Cover map. Make sure that your LULC input resolution is high enough to capture differences between scenarios: if you add a 5 meter wide bioswale, that will not be represented accurately in a 30 meter resolution raster. All other inputs are resampled to the LULC pixel size.

  • LULC: Make an edited version of the baseline LULC to represent your scenario. Mark the proposed bioswales as a new (or existing) LULC class.
  • Biophysical table: If bioswales are a new LULC class, add a row to the biophysical table for that class.
  • Built infrastructure vector: If the bioswales are replacing any building infrastructure, update the built infrastructure vector accordingly.
  • Watershed vector: does not change, unless your bioswale significantly modifies where water will flow
  • Rainfall depth: does not change
  • Soil hydrologic groups: does not change
  • Damage loss table: does not change

Great question.
I am currently working on the same challenge to using different nature based solutions to change the landcover enough such that the runoff retention is higher.

It would be great to collaborate on the same.