SLRModel

The sea level rise model for UrbanSim will consist of two parts: permanent inundation and temporary flooding.

Both rely on data from BCDC's Adapting to Rising Tides project, which has been used to tag parcels by the height at which they will experience sea level rise (i.e. affected after 12in SLR, affected after 77in SLR). This is found in the baus data folder as slr_parcel_inundation.csv.

Three "Futures" define the different scenarios for sea level rise, as a 1', 2', or 3' increase in sea level. Three tables have been created to indicate the progression of both flooding and inundation throughout the model's 5-year periods. For example, for Future 1 by 2045 we expect flooding to occur on parcels marked 36in, while inundation has occurred on parcels marked 12in. These tables are found in the baus data folder as slr_progression_f1.csv, slr_progression_f2.csv, slr_progression_f3.csv.

1. Permanent Inundation model steps: hazards.py

• "slr_inundate" queries the year to find the inundation height from slr_progression_fX.csv, then marks all parcels tagged with this height as not developable in a new "slr_nodev" column
• "slr_remove_dev" identifies the buildings on inundated parcels and removes them, as well as the residents and jobs in those buildings
• these steps are added as the first to run in the model sequence, so inundation happens before anything else
• a new summary step, "hazards_summary", is added to summaries.py, to tally the number of impacted parcels, residential units, and building sq. ft. It also counts the households and jobs by type that have been impacted

2. Temporary Flooding: hazards.py

• this model will use the "floodier" column of slr_progression_fX.csv to determine the year parcels experience flooding
• the current approach is to raise the vacancy rates of zones for these parcels
• in addition, prices will change. The recommendation from MTC's resilience planners is to reduce the value of properties by 10%