Flood Survival Kit: Flash Flood Emergency Guide
Flooding is the most common and most costly natural disaster in the United States: it kills more Americans annually than tornadoes or hurricanes. Flash floods are particularly deadly because they develop within hours of heavy rainfall, often with minimal warning. A flood emergency kit combines immediate evacuation capability with flood-specific supplies and the critical understanding that a small amount of moving water (6 inches) can knock down an adult, and 2 feet of moving water will carry away most vehicles. This guide covers exactly what to have, when to leave, and how to survive flood conditions.
The Flash Flood Rules
- Flash Flood Watch: Flash flooding is possible: move to higher ground if in a flood-prone area; do not wait for the warning
- Flash Flood Warning: Flash flooding is occurring or imminent: move to higher ground immediately; do not attempt to drive through any flooded area
- If caught in a vehicle in rising water: Exit the vehicle and move to higher ground if water is still passable; if trapped in a rising vehicle, open a window, escape to the roof; do not open the door until water pressure equalises
- Never shelter in a basement during a flash flood: basements fill with water rapidly and you may become trapped below grade
Flood Emergency Kit Supplies
Waterproof Evacuation Kit
- Waterproof duffel bag or dry bag (60L minimum) × 1: everything stored inside must survive water immersion
- Waterproof document sleeve (passport, insurance, IDs) × 1
- USB drive with digital copies of all documents
- Cash ($500+) in a waterproof zipper bag
- All prescription medications in waterproof container
- First aid kit (in waterproof bag)
- 3-day food supply (pouched or canned items that survive dampness)
- Water purification tablets × 50: flooded water sources are heavily contaminated
- Water filter (Sawyer Squeeze): for post-flood water sourcing
- Phone + charger in waterproof pouch
- Portable power bank (waterproof rated, e.g., Anker PowerCore)
Flood-Specific Safety Equipment
- Life jackets (PFDs) × 1 per household member (USCG-approved Type III or IV)
- Waterproof chest waders: for safely moving through shallow flood water post-storm
- Waterproof rubber boots (Wellington boots) × 1 pair per person
- Waterproof gloves × 2 pairs: flood water is contaminated; minimise skin contact
- N95 masks × 20: for mould exposure during cleanup
- Portable bilge pump (electric, 12V): for removing water from basement or lower floors
Waterproofing Your Kit
In a flood scenario, your emergency kit may be submerged, soaked, or carried through water. All supplies must be waterproofed:
- Dry bags: Roll-top dry bags (Sea to Summit, NRS) are the most reliable waterproof storage; store electronics, documents, food, and clothing inside individual dry bags
- Waterproof hard cases: Pelican cases provide crush-proof, waterproof storage for valuables, electronics, and medications
- Ziplock freezer bags: A practical first line of waterproofing for documents, medications, and electronics: double-bag for additional protection
- Test your waterproofing: Before an emergency, put your kit in the bathtub and verify everything inside remains dry: gaps in waterproofing are discovered at the worst possible time otherwise
Home Flood Protection Measures
Temporary Flood Barriers
- Sandbags: The traditional flood barrier: fill with sand or soil, stack 2 feet high along entry points; requires advance preparation and physical labour; ineffective against deep flooding
- Water-filled flood barriers (AquaDam): Long plastic tubes filled with water that create a barrier against incoming water; no fill material needed; more effective than sandbags for many applications
- Door flood shields: Aluminum or composite barriers that seal doorways against water ingress; permanent installation options for repeatedly flooded areas
- Sump pump: Essential for homes with basements in flood-prone areas; a backup battery-powered sump pump continues operation during power outages when basement flooding most commonly occurs
Before Flood Season
- Know your flood zone designation: FEMA’s Flood Map Service Center (msc.fema.gov) shows your property’s flood risk
- Purchase flood insurance if in a flood zone: standard homeowner’s insurance does NOT cover flooding; NFIP (National Flood Insurance Program) flood insurance is available through your insurer
- Elevate electrical systems (panel, outlets, switches) above expected flood levels in repeatedly flooded homes
- Install check valves on plumbing lines to prevent sewage backup into the home
After the Flood
- Do not return home until authorities confirm it is safe: structural damage may make buildings unsafe
- Assume all floodwater is contaminated: sewage, chemicals, agricultural runoff; never consume flooded water; wash hands frequently; wear gloves and waterproof boots when wading
- Do not eat any food that touched floodwater: including canned goods if the label is damaged or if the can was submerged (cannot confirm seal integrity)
- Document all damage before cleanup for insurance claims
- Dry out within 24–48 hours to prevent mould: use fans, dehumidifiers, and open windows when outdoor air is dry; mould begins growing within 24 hours in wet conditions
- Mould remediation: Wear N95 masks during cleanup; remove all wet materials; treat with a bleach solution (1 cup bleach per gallon of water) for hard surfaces
Recommended Products
Sea to Summit Ultra-Sil Dry Sack (35L)
A waterproof dry sack is the most important flood kit modification for any emergency bag: it ensures that your most critical supplies (documents, medications, electronics, food) survive water immersion intact. The Sea to Summit Ultra-Sil uses roll-top closure and welded seams to achieve waterproof rating (not water-resistant: actually waterproof under submersion). At 35 litres, it holds a full 72-hour kit’s worth of supplies. Buy two: one as your main emergency go-bag liner, one as a dedicated document and electronics dry bag. Never trust a standard zipper bag for flood scenarios.
- Roll-top sealed, welded seams: genuinely waterproof under submersion
- 35L capacity: full 72-hour kit storage
- Lightweight; packable; Sea to Summit reliability
Wayne CDU980E Combination Sump Pump with Battery Backup
A basement sump pump with battery backup is the most effective home flood protection measure for properties with basements. The Wayne CDU980E combination unit operates normally on AC power but automatically switches to battery backup (included) when power fails: which is precisely when flooding most commonly occurs. The AC pump handles up to 4,600 gallons per hour; the battery backup extends operation during outages. Basement flooding during power outages is one of the most common and most expensive flood damage scenarios in the US: this $250 unit prevents far more in water damage than it costs.
- AC primary pump + automatic battery backup: works during power outages
- 4,600 GPH capacity; handles serious flooding events
- Prevents the most common flood damage scenario: basement flooding during outages
Flood Preparedness FAQ
Does my homeowner’s insurance cover flood damage?
No: standard homeowner’s insurance does NOT cover flooding, regardless of the flood’s source. You need a separate flood insurance policy through the NFIP (National Flood Insurance Program) administered through your insurance agent, or a private flood insurer. NFIP policies cover structural damage up to $250,000 and contents up to $100,000. There is typically a 30-day waiting period before coverage begins: you cannot purchase flood insurance after a storm is forecast and expect immediate coverage. If you live in or near a flood zone, purchase flood insurance now, not after the next flood event.
How do I know if my area is at risk of flooding?
FEMA’s Flood Map Service Center (msc.fema.gov) shows official flood zone designations for every property in the US. Zone A and AE designations indicate 1% annual chance (100-year) flood zones; Zone AE includes Base Flood Elevation data. Zones V and VE are coastal high-hazard areas. Zone X indicates lower risk (outside 500-year floodplain). Your flood zone also determines whether flood insurance is required for your mortgage (required in Zone A and V areas with federally backed mortgages). Note that flood risk also exists outside formal flood zones: any property in a low-lying area or near a waterway has some flood risk even if not mapped in a high-risk zone.