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Aerial view of a flooded Texas neighborhood, streets and yards under brown floodwater while nearby blocks stay dry

Scenario 21 · The most common U.S. disaster

How to Prepare for a Flood

The supplies, the timeline, and what the water actually does to a week. Built from FEMA and National Weather Service guidance, made livable.

Updated July 2026 · Alert timing follows the National Weather Service

Flooded neighborhood, Texas · FEMA

Quick answer

Plan to be on your own for 7 days. For 4 people that means 28 gallons of water (floods are when tap water goes on boil notice), about 56,000 calories of food that needs no cooking, documents in a waterproof bag, and a rule everyone already knows: nobody walks or drives through moving water. Most kitchens hold 3 to 4 days. This page shows you the exact gap.

Numbers are set for 4 people. Change your household size below and every quantity updates.

6 inches

Moving water that can knock an adult down

12 inches

Enough to float most cars

30 days

Flood insurance wait before coverage starts

1 gal

Water per person per day

How a flood actually unfolds

Watch issued

Conditions are right, water is not here yet. Quiet window: move cars to high ground, charge everything, put documents and medications in one waterproof grab bag.

Warning · Water rising

Move people, pets, and anything valuable up a level. Know where your electrical panel is, and if officials say leave, leave while streets are still streets.

During

The rule that does the most work: turn around, don't drown. Six inches of moving water takes your footing, a foot floats the car. Stay put, stay high, stay off the roads.

After · The long part

Floodwater is not rainwater: it carries sewage, fuel, and debris, and tap water often needs boiling until cleared. Photograph everything before you touch it. Mold starts inside 24 to 48 hours.

Play it out

Two inches an hour, three decisions

A quick role-play of how a flood week actually goes for a family of four. Pick what your household would honestly do.

Scene 1 of 3

Sunday evening. A flood watch covers your county through Tuesday, and the radar shows training storms, the kind that park over one spot and rain for hours. The creek behind the neighborhood is already talkative.

Prefer to read it straight through?

Scene 1

Sunday evening. A flood watch covers your county through Tuesday, and the radar shows training storms, the kind that park over one spot and rain for hours. The creek behind the neighborhood is already talkative.

If you it always drains. this street has never flooded: Mostly true, until the night it isn't. By 11pm the storm drain is a fountain and both cars are parked at the low end of the driveway. Nothing is lost yet, but every option you have left is wetter and more expensive than it was at 7pm.

If you spend 30 minutes moving what matters up and out: Cars to the church lot on the hill, documents and chargers into one bag upstairs, garage floor cleared onto shelves. It felt like overkill right up until the gutters started shouting. Now it just feels smart.

Field note: Flood damage is a height game. The difference between a soaked keepsake and a safe one is usually about three vertical feet, moved during the boring window before water arrives.

Scene 2

Monday, 6:40am. There is a lake where the intersection used to be, maybe a foot deep and moving. Your car sits on the far side. A pickup crosses slowly and makes it, wake slapping the mailboxes.

If you the truck made it. wade over and drive out before it gets deeper: Halfway across, the current tugs your knees sideways and the pavement under the water is not where you remember it. You make the far curb soaked, phone dark, and the car sputters at the first dip anyway. Now two things need rescuing and one of them is you.

If you the car has insurance. feet stay dry: You watch a sedan try it an hour later and stall mid-crossing, hazards blinking in the brown water. The tow bill is theirs. Your morning costs you a work-from-home day and another pot of coffee.

Field note: Moving water is heavier than it looks and hides what the road is doing underneath. Most flood vehicle losses happen in water a driver judged shallow enough. Cars are replaceable on a schedule; the crossing is not.

Scene 3

Wednesday. The water is gone from the street and down to a film in the garage. The fridge hums back on. Everything the water touched has a gray line on it, and the whole block smells like a wet basement.

If you rip everything out today, bare hands, windows open: Speed feels right but skips two steps that cost you later: no photos for the claim, and no gloves between you and whatever the water carried in. The adjuster asks for documentation you now have to reconstruct from memory.

If you photograph first, then gloves, boots, and a box fan: Twenty minutes of photos and a numbered list turn the claim from an argument into paperwork. Gloves and boots keep cleanup a chore instead of a clinic visit, and the fans get ahead of the mold clock.

Field note: Insurers pay on evidence. Photograph and list damage before removing anything, keep receipts for cleanup, and treat everything floodwater touched as contaminated until washed or tossed.

The flood checklist

People in your household

One page per scenario: quantities resize in place, and the link you share always shows this plan.

Your head start

0 of 7 days covered

0 of 13 essentials on hand

Tick what you already own.Save this as your real plan →

Supplies buy you days. Gear keeps those days livable. Most families discover they start around day 3.

ItemFor 4 peopleWhy it mattersCovers
Water · 28 gallons total
Bottled water, 24-pack cases6 cases (about 17 gal)Sealed, portable, splits between rooms and the car.Days 1 to 5
5-gallon water jugs3 jugsThe cheapest gallons you can store. Fill spares before the event, not during.Days 6 to 7
Water purification tablets1 packTurns suspect tap or tub water into drinking water after day 7.Backup
Food, no cooking required
Canned protein: tuna, chicken, beans18 cansEats straight from the can when the stove is out.No cooking
Canned vegetables and fruit20 cansFluids and vitamins while the fridge is dark.No cooking
Peanut butter2 large jars2,650 calories per jar, no prep, kids will actually eat it.No cooking
Crackers, tortillas, granola bars4 boxes plus a dozen barsThe bread aisle empties first. These keep for months instead of days.No cooking
Oats and shelf-stable milk6 cartons plus a canister of oatsBreakfast without power, and the milk needs no fridge until opened.No cooking
Power, light, and news
Flashlights or headlamps5 flashlightsOne per person plus a spare. Candles start fires in dark houses.All week
Batteries in every size you use2 packs per sizeThe thing that runs out on day 2 if you guess.All week
Phone battery banks, fully charged2 banksYour phone is your flashlight, radio, and lifeline. Top the banks up the moment trouble is forecast.All week
NOAA weather radio, battery or crank1When cell towers and wifi fail, official updates still reach you here.All week
Health and documents
First aid kit1Minor injuries spike during cleanup, exactly when help is hardest to reach.All week
Prescription medications14-day supply eachPharmacies reopen slowly. Ask your pharmacist about an emergency refill before you need it.2 weeks
Documents in a waterproof bagIDs, insurance, cash in small billsATMs and card readers die with the power.Grab and go
Manual can opener1Most of the calories above are locked inside cans without it.Critical
Flood specific
Rubber boots and heavy gloves4 setsFloodwater carries sewage, fuel, and glass. Cleanup happens in boots, not sneakers.After
Sandbags or door flood barriers10 to 20 bagsA low doorway diverted for an hour can be the whole difference downstairs.Before
Unscented bleach1 bottleDisinfects what the water touched, and 8 drops per gallon treats water in a pinch.After
Tarps and contractor trash bags2 tarps, 1 box of bagsWet things leave the house fast. These are how.After

Quantities land slightly above target on purpose: appetite and stress go up in a real emergency. Swap freely inside each category to match what your family actually eats. Print this page to take it shopping.

In the app

Your flood plan should not live on a printout

Provision Planner has a built-in Flood scenario. Add your supplies once and it tells you how many days you would last, what expires next, and what to restock. Live National Weather Service alerts are built in, so the flood warning and the plan live in the same place.

Run the flood scenario

Frequently asked questions

How much water does a family of 4 need for a flood?

28 gallons: one gallon per person per day for 7 days. Floods are the disaster where stored water earns its keep, because flooded treatment systems put whole counties on boil-water notices for days after the water recedes.

Does homeowners insurance cover flooding?

Standard homeowners and renters policies do not cover flood damage. That is separate flood insurance, most commonly through the National Flood Insurance Program, and new policies typically wait 30 days before coverage starts. If flooding is on your mind, the paperwork has to happen a month before the water. Confirm details for your state and policy with your agent.

When should we evacuate instead of staying?

When officials say so, or when water threatens your safe room upstairs. Leave early while streets are passable: the most dangerous part of most floods is driving through water. A foot of moving water floats most cars, and flooded roads hide washouts underneath.

What do we do right after the water goes down?

Photograph and list all damage before touching anything, then work in boots and gloves. Treat tap water as suspect until officials clear it, watch for tripped breakers and wet outlets before turning power back on, and move fast on drying: mold gets its start within 24 to 48 hours.

Explore more scenarios

Every scenario gets the same treatment: the event, the supplies, the timeline, and your number.

Go deeper: Flood Preparedness Checklist · Bathtub Water Storage, Done Right · 2-Week Supply Plan for 4 People · Food Storage Calculator

Water and calorie targets follow FEMA and Ready.gov emergency planning guidance; alert timing and water-safety rules follow the National Weather Service and CDC. Insurance details vary by policy and state. This is general planning guidance: adjust for allergies, medical needs, and what your household actually eats. If officials order an evacuation, leave. Photography: NASA image library and Pexels, used under their respective licenses.