More Arlington properties are now located within floodplains, county says

FEMA’s new flood map for Rock Spring (via Arlington County)
More Arlington properties could be impacted by 100- and 500-year floods, according to new federal flood insurance rate maps.
The county estimates some 300 buildings, up from 172, now risk a 1% annual chance of being inundated by floods expected to happen once a century. Another 1,150 parcels, up from 1,054, face a 0.2% annual chance of floods that come around every half-millennia.
It identified the probable increase after comparin