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October 29, 2026

Poll: How deep does fast-moving water need to be to carry away most cars?

Poll: How deep does fast-moving water need to be to carry away most cars?
# Flood
# Driving
# El Niño

A behavioral science informed suggested post to help pursuade neighbors to avoid driving through flood waters

Joseph Porcelli
Joseph Porcelli
Poll: How deep does fast-moving water need to be to carry away most cars?
Poll question: How deep does fast-moving water need to be to carry away most cars?
Answer options: → 6 inches → 12 inches → 18 to 24 inches → 3 feet
Poll description: Floodwater depth is hard to judge by eye, and you can’t see whether the road under it is still there. We want to know where [City/Town] stands. When this poll closes, we’ll repost it with the answer. ##
Seed comments: post each as a separate comment immediately after publishing:
  • Comment 1: Has your household talked about which roads near you cover with water when it rains hard?
  • Comment 3: Which road in [City/Town] do you avoid when the rain is heavy? Share it here for the rest of us.
Poll repost
In the poll below, we asked, How deep does fast-moving water need to be to carry away a small car?
[Insert your results here, for example: “X percent of you said 18 to 24 inches.”]
The answer is 12 inches. The National Weather Service says 12 inches of fast-moving water can carry away a small car. 6 inches can knock over an adult. 18 to 24 inches can carry away most large SUVs, vans, and trucks.
You can’t judge depth by looking, and you can’t see whether the road under the water is still there. Getting through once doesn’t make it safe. More than half of flood-related deaths come from driving or walking into floodwater.
If the road is covered, turn around, [City/Town].
Who in your household drives? Who did you share this with?
Seed comments: post each as a separate comment immediately after publishing:
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