Nepal Flood Early Warning: How Alerts Reach You and What to Do

Alert names, colour codes and contacts change. This page explains how Nepal's flood warning pipeline generally works and what is expected of you when a warning arrives. Re-check the issuing agency's own site before each monsoon rather than trusting a saved copy.

Nepal's flood early warning system has one job: get a credible warning from the office that issues it to the person standing in the water's path, fast enough to change what that person does next. The first half of that job is institutional. The second half is you. What follows explains who generates a warning, which channel carries it, and what each level of warning asks of you. It is not a forecast and it is not a full disaster-preparedness manual. If an emergency is unfolding around you, follow the issuing agency's live instructions rather than a page you read last week.

Who runs the system

Two names matter. The Department of Hydrology and Meteorology (DHM) is Nepal's hydrology and meteorology agency. It watches rivers and rainfall, and it is the body that issues flood bulletins and forecasts. Its website is dhm.gov.np. The National Disaster Risk Reduction and Management Authority (NDRRMA) is the national disaster management authority, with district and local disaster management committees working beneath it. Its website is ndrrma.gov.np. If either address has changed, search the agency name rather than following an old link.

In rough terms, DHM watches water and rainfall, while NDRRMA and the committees organise the response. That split matters more than it sounds, because it decides whether something you received is a warning or an instruction. A warning tells you what the river is likely to do. An instruction tells you to move. Both can arrive on the same phone within minutes of each other.

From gauge to phone

A warning begins as a measurement. River gauges and rainfall readings, read alongside forecasts, are compared against thresholds set for each monitored station. When a station crosses its threshold, the technical team issues a bulletin. After that, the message has to travel.

Depending on the basin and district, it may reach you by radio or television, SMS or automated calls to registered numbers, sirens, the agency's website and social channels, or volunteers and ward committee members going door to door. Which of those is live in your area is not uniform across the country and changes as systems are upgraded. The practical step is to find out now which one reaches your household, because on the night it matters you will not have time to look it up.

Lead time is the whole point. A warning that arrives after the water does is not a warning, it is a record of one. Every step in the chain, the gauge reading, the decision to issue, the relay through a ward, the phone in your pocket, eats a little of that time. That is why the system asks you to act on less than perfect certainty, and why you should not wait for a second confirmation before moving.

How to read alert levels

Flood warnings are graded, and for good reason. The difference between a river that might rise and a river that is already coming over the bank demands completely different responses. The exact names and colour coding are set by the issuing agency and have changed over the years, so read the current scheme on DHM's own site rather than from a screenshot someone forwarded.

The reasoning behind the grades holds regardless of the wording:

• Lowest level, watch. Rain is heavy or a river is rising. Nothing is certain yet. Use the time to prepare: charge, pack, move things up, agree where the household meets.
• Middle level, get ready to move. This is when you shift what you can to higher ground, confirm your route is open, and tell someone outside the house what you are doing.
• Highest level, move now. No second confirmation, no waiting to see.

Two rules apply at every level. Never walk or drive through moving water. Never cross a flooded bridge, whatever the water looks like from the bank.

What to do when a warning reaches your phone

People first. Documents, livestock and stock come after. Take the route you already know is open rather than the shortest one, because the shortest one is often the one with water on it. Tell one person outside your household where you are going. Conserve phone battery by turning off what you do not need. If the family is separated, agree a single meeting point and hold to it instead of splitting up to search.

And go early. The most common way people get hurt in a flood is by leaving too late, after the road is already impassable and the decision has been taken out of their hands.

Checklists

At home

1. Know your nearest high ground and the safe route to it.
2. Keep documents together in one waterproof bag, ready to grab.
3. Store drinking water and dry food for several days.
4. Charge phones and a power bank before the rain peaks.
5. Move grain, gas cylinders and electronics to a high shelf or upper floor.
6. Agree a family meeting point and an out-of-area contact.

Shop, guesthouse or small firm

1. Decide who can order a closure, and who decides if that person is unreachable.
2. Move stock and account records above the level water reached last time.
3. Photograph stock and fittings before the season, for any insurance claim, relief assessment or police report.
4. Keep a staff phone tree with more than one contact for each person.
5. Unplug equipment and shut off power if water is approaching.
6. Record any damage with dated photos and a written list.

Travelling or trekking

1. Check the forecast and any active bulletin on the morning you set out.
2. Ask locally about the next river crossing before you reach it.
3. Never cross a flooded bridge or a stream that is rising.
4. If an alert arrives, stop and reassess rather than pushing on.
5. Tell someone your route and expected arrival time.
6. Keep cash, water and a charged phone on your person, not in your pack.

Glossary

Gauge station: a fixed point on a river where the water level is measured.

Threshold: the reading at which a station triggers concern, prompting the technical team to look closer and decide whether to issue.

Bulletin: the agency's published statement on current or expected river and rainfall conditions.

Basin: the area drained by one river system.

Lead time: the gap between a warning reaching you and the impact it is warning about.

Ward disaster committee: the local body that relays warnings to households.

Evacuation route: the agreed way to high ground.

Dissemination channel: whatever carries the message to you, whether that is a phone, a siren, a radio or a neighbour at the door.

Questions people ask when a warning lands

I got an SMS but it doesn't name my district. Is it for me?

Treat an official message as relevant until you can confirm otherwise. Alerts often go out by area or by river basin rather than by district name. Check the agency's current bulletin and your ward committee's local update, then act on the more cautious of the two. If it turns out to be for somewhere else, you have lost a little time and nothing more.

The river near me is rising but no alert has come. Who do I tell?

Your ward or local disaster management committee is the fastest route, with the district committee above it. Report the location and what you can actually see. If water is already threatening life, move first and report afterwards.

Which emergency numbers should I save?

Save the ones your ward or district committee gives you, plus the number for your nearest police post. National emergency numbers exist and are widely used, but numbers and call routing are exactly the kind of detail that gets revised, so verify the current ones from an official source rather than from a list you saw somewhere online. Do that check before the monsoon, not during one. If a number does not connect, fall back to whatever your ward committee gave you.

How do I know an alert isn't a forwarded rumour?

Check the source, not the wording. A genuine alert traces back to the issuing agency's own published bulletin or to an official channel in your district. Forwarded voice notes, screenshots and social posts with no traceable origin are not alerts, even when they get the details roughly right. If you cannot trace a message, treat the underlying risk as real but verify before you pass it on.

My phone was off, or I don't have a smartphone. How would I be warned?

That is why the pipeline is not only digital. Radio, sirens and volunteers going door to door still carry warnings in many places. Ask your ward committee which method covers your area, and make sure at least one person in your household is reachable by phone. Tell the committee about any neighbour who cannot be reached another way. The system is only as good as its last step, and that step is usually a neighbour knocking on a door.

Who do I contact if someone is missing?

Start with the local police post and your ward or district disaster committee, which coordinate search and rescue locally. Give a clear description, the last known location and the time. Do not enter floodwater or a landslide zone to search yourself. Say if road access is cut, so responders know what they are dealing with.

How to check an alert is real, and how to keep checking

Confirmation is a quick habit, not a project. Find the issuing agency's current published bulletin and match what you received against it. If a forwarded message names a level or a time, look for that wording at the source. A message that does not match stays unconfirmed, and unconfirmed does not mean harmless.

Know your local contacts before you need them: save the ward and district committee numbers and your nearest police post in the phone you actually carry. When travelling, re-check the bulletin the morning you leave and again before any river crossing on the route. If an old saved message shows a short code or a phone number, confirm it is still current before you rely on it.

That is the whole system from your side of it. The agencies will change their wording, add a channel, retire a short code, and none of that changes what you are expected to do. Know which message reaches your house, know where you go when it arrives, and go there without waiting for someone to tell you twice.