A study published this month in Earth's Future reconstructed all 224 deaths from the July 2021 Belgium-Germany floods. Twenty-two percent died in basements. They were checking sump pumps, hauling belongings upstairs, starting cleanup. Doing the work the protection equipment asked of them, on the schedule the floodwater set.
The same arithmetic shows up with generators. CPSC data put portable-generator carbon monoxide deaths at roughly 85 a year in the U.S. Eighty-nine percent of fatal post-storm CO cases happen within three days of the disaster, while the machine still needs fuel. Carbon monoxide is odorless. Most victims lose consciousness before they know anything is wrong.
And here's a detail worth sitting with: standard flood insurance carries a "duty to mitigate" clause requiring policyholders to protect their property from further damage during and after a flood. The insurer writes the obligation. The homeowner walks down the basement stairs to fulfill it.
What work does it create? Sump pump monitoring during active flooding. Generator placement 20+ feet from the house, fueling and refueling during outages. Flood barrier deployment by hand.
Who does it? The homeowner, usually alone. Older adults overrepresented in basement flood deaths. 70% of Hurricane Harvey storm-related deaths were male.
When? During the hazard itself. The storm sets the maintenance schedule.
What says stop? For flooding, nothing clear — the Thieken study found deaths on upper floors too. For CO, nothing perceptible — odorless, colorless, causes unconsciousness before symptoms register.
What this doesn't settle: Whether any device causes net harm. Generators also prevent heat illness, medication failure, food spoilage. The CO literature doesn't count what generators prevent.