Guide · Flooding
Urban flood early warning: using the signal you already have before the street floods.
In most city floods the rain was on the gauges well before the street went under. The warning window existed; nobody was watching it.
An urban flood early warning system watches rainfall, drain and channel levels and pump status together, and alerts the people who can act when the combination says a street or ward is about to flood.
What it watches
| Input | What it tells you |
|---|---|
| Rain gauges | How hard it is raining, and where |
| Channel and drain levels | Whether the network is keeping up |
| Pump telemetry | Which pumps are actually running |
| Citizen complaints | Where water is already standing |
| Drainage maps and low-lying wards | Where water will go next |
How alerts should be set
- Combine rain rate with channel trend, not rainfall alone.
- Tie each rule to the wards and drain segments it covers.
- Treat a silent sensor or pump as unknown, not as fine.
- Send the alert to named owners with a clear first action.
- Review every alert after the event: was it early enough, and was it acted on?
The Indian monsoon context
Many Indian cities face short, intense monsoon bursts on drains that are partly silted and pumps that are not all monitored. A warning system there has to work with incomplete telemetry and has to reach ward teams on the phones they already use.
How CityWatch does it
CityWatch puts rain gauges, channel levels, pump telemetry, citizen complaints and crews on one live map for municipal commissioners, city engineers and ward officers. When rain rate and channel trend cross a threshold, it proposes an alert with the wards at risk. Pumps are shown as running, offline or “no telemetry”, never assumed. Complaints on WhatsApp, the helpline or the web become tickets located to the drain segment, with duplicates grouped; the nearest crew with the right equipment is routed and the citizen gets the ETA and a closing photo. Desilting is closed with geotagged before/after photos per drain segment, every ward is ranked, any event can be replayed minute by minute, and the daily report is drafted from the record with sources.
Questions
What is an urban flood early warning system?
A system that watches rain gauges, drain and channel levels, pump status and complaints together and alerts the people who can act before a street or ward floods.
Is rainfall data enough to predict waterlogging?
Rarely on its own. Combining rain rate with channel trend and pump status for each ward gives a much more useful signal.
What if some pumps have no telemetry?
Show them as “no telemetry” rather than assuming they are running, so the team knows where to send someone to check.
See it on your own data. CityWatch — Warn before the street floods. Book a 30-minute working session with an engineer.