Twelve inches of moving water is enough to carry away most cars
The National Weather Service puts hard figures on it: "It takes just 12 inches of rushing water to carry away most cars," while "2 feet of rushing water can carry away SUVs and trucks," and "a mere 6 inches of fast-moving flood water can knock over an adult." The same guidance notes that over half of all flood-related drownings happen when a vehicle is driven into hazardous flood water.
Twelve inches is less than it sounds like standing at the edge of a flooded road. It is roughly the height of a car's wheel rim, and it looks entirely manageable from the driver's seat. What the view from the seat does not show is whether the water is moving, how deep the middle of the road is, or whether the pavement under the water is still there. Water that is flowing across a road has usually come from somewhere, and it takes roadbed with it.
Depth is also not the only threat. Most cars will draw water into the air intake well before the water reaches the door sill, and an engine that ingests water tends to stop being an engine.
Charlotte County's flooding risk runs on a calendar
Charlotte County's exposure runs on a calendar. The National Hurricane Center states that the Atlantic hurricane season runs from June 1 to November 30, that the climatological peak is September 10, and that most activity occurs between mid-August and mid-October. Layered on top of that is the Southwest Florida wet season, when near-daily afternoon thunderstorms can drop a great deal of rain on already saturated ground in a short window.
That combination is what produces the familiar Port Charlotte pattern: streets that drain perfectly well in March holding water in September, because the water table is high, the ground is saturated and the storm arrived at 4 p.m. on top of a week of rain. Low-lying neighborhoods near canals and the Peace River feel it first, but it is not confined to them.
Charlotte County Emergency Management is the authoritative local source for storm and flooding information for residents, and its office can be reached at 941.743.1200. Worth knowing before a storm rather than during one.
If your car stalls in water, the decision is about you, not the car
If the engine dies while the car is in water, the useful question is not how to save the car. It is whether the water is rising or moving.
If water is flowing or getting deeper, leave the vehicle and get to higher ground immediately. A car is not a shelter in moving water, and a stalled car in a rising channel is a hazard rather than a refuge. If the water is still, shallow and clearly not rising, staying in the vehicle with hazard lights on until help arrives is often the safer option, particularly on a road with traffic.
Two practical details matter here. Electric windows stop working once water reaches the electronics, so lower a window early if you expect to get out. And doors become difficult to open against even modest water pressure, which is the reason the window is the better plan rather than the backup.
Once you are out, do not wade back to the car for belongings. Moving water and the six-inch figure from the National Weather Service apply to a person on foot, and floodwater in a residential area routinely carries debris and hides open drainage.