ENVIRONMENT / FLOOD
Flood & Environmental Monitoring Sensors (UK)
Watch the water rise before it reaches the door
The short answer
How do you monitor flood and water levels with IoT sensors?
You monitor flood risk by fitting battery LoRaWAN level sensors above rivers, culverts, gullies and attenuation tanks that measure water level by radar or ultrasonic and report over EU868 radio to a gateway. Rising level crosses a threshold and raises an alert in minutes, so operators act before a road, culvert or basement floods rather than after.
Councils, drainage boards and agencies carry flood and watercourse duties on budgets that will never stretch to staffed gauging at every culvert, gulley and beck. So the first warning of a blockage or a rising river is often a flooded road or a flooded home. The cost is emergency response, damage claims and public accountability for risk that was monitored nowhere.
Talk through your site ● Answered within one working day
The difference
Flood monitoring sensors: what changes the day it goes live
Councils, drainage boards and agencies carry flood and watercourse duties on budgets that will never stretch to staffed gauging at every culvert, gulley and beck. So the first warning of a blockage or a rising river is often a flooded road or a flooded home. The cost is emergency response, damage claims and public accountability for risk that was monitored nowhere.
- River and watercourse level monitoring at the points that matter, not just official gauging stations
- Gulley and culvert state, so a blockage is flagged before it backs up
- Early flood alerting to teams and residents while there is still time to act
- Solar and satellite options for remote catchments with no power and no signal
What you get
- 01
River and watercourse level monitoring at the points that matter, not just official gauging stations
- 02
Gulley and culvert state, so a blockage is flagged before it backs up
- 03
Early flood alerting to teams and residents while there is still time to act
- 04
Solar and satellite options for remote catchments with no power and no signal
The full stack, applied here
One rising beck, watched before it reaches the door
Every Indiott build runs all five layers as one accountable system. Follow a single river level rising from the sensor that catches it to the report that proves it.
Submersible and ultrasonic level sensors watch rivers, culverts and gulleys at the points that matter, IP68-rated for permanent in-watercourse duty, radar level on request.
Hands a level reading to CONNECT ↓
Solar LoRaWAN gateways cover off-grid catchments and satellite NTN fall-back reaches the remotest becks, so a gulley miles from power still reports before it backs up.
Hands an uplinked reading to SECURE ↓
A VPN router keeps a public-body telemetry feed authenticated and unspoofable, so a flood-warning trigger sent to teams and residents can be trusted as genuine, not a false alarm.
Hands a trusted alert to CONTROL ↓
Ready to act on the catchment: Remote IO can raise a warning beacon, drive a penstock or start a pump the moment a level threshold is crossed, not after the road floods.
Hands an action and proof to MANAGE ↓
Threshold alerting, river-level trend dashboards and early warning to teams and residents while there is still time to act, feeding straight into existing flood response under FWMA 2010.
The loop is closed ✓
How teams start
From a single pilot to the whole portfolio
You do not boil the ocean. Nearly every rollout runs the same four moves, and you own a working, evidenced result at the end of the first one.
Scope & risk map
We walk the sites, list the assets and pin the one constraint that matters, then agree what a good result looks like before a single sensor is bought.
Pilot on one site
A focused set of sensors goes onto one site or asset group, live on our telemetry and dashboards, wired to the people who need the alert.
Validate & standardise
We tune thresholds, kill false positives, confirm the integration into your SCADA, BMS or CAFM, and write the standard design down so it repeats.
Scale the portfolio
The proven design rolls out across the estate, reusing the same hardware standards and data models so every site reads the same way.
The flood monitoring sensors kit we deploy
Full catalogue
Milesight EM400-UDL Ultrasonic Distance/Level Sensor
£194.52 ex VAT
Milesight EM500-UDL Ultrasonic Distance/Level Sensor
£202.01 ex VAT
Milesight EM410-RDL Radar Distance/Level Sensor
£224.45 ex VAT
Milesight EM500-SWL Submersible Water Level Sensor
£251.38 ex VAT
Milesight EM411-RDL Radar Distance/Level Sensor
£314.23 ex VAT
Milesight Water & Leak Monitoring Kit — Gateway + Level + Leak Sensors
£360.62 ex VAT
Milesight EM500-SMTC Soil Moisture, Temperature and Electrical Conductivity Sensor
£371.09 ex VAT
Milesight WTS506 IoT Weather Station
£2,244.51 ex VAT
Flood monitoring sensors costs between £194.52 and £2,244.51 ex VAT in the UK. Indiott published prices, September 2026. Delivery is charged by weight; VAT is added at checkout.
| Model | Key specification | Price ex VAT | Availability |
|---|---|---|---|
| Milesight EM400-UDL Ultrasonic Distance/Level Sensor EM400-UDL-868M | Measuring range (probe dependent): C050 25 ~ 500 cm; C100 25 ~ 1000 cm; W050 30 ~ 500 cm; W100 50 ~ 1000 cm | Price range: £194.52 through £366.60 ex VAT (£233.42 – £439.92 inc. VAT) | In stock, UK · dispatched within 14 working days |
| Milesight EM500-UDL Ultrasonic Distance/Level Sensor EM500-UDL-868M | Measuring range (probe dependent): C050 0.25 - 5 m; C100 0.25 - 10 m; W050 0.3 - 5 m; W100 0.5 - 10 m | Price range: £202.01 through £344.16 ex VAT (£242.41 – £412.99 inc. VAT) | In stock, UK · dispatched within 14 working days |
| Milesight EM410-RDL Radar Distance/Level Sensor EM410-RDL | Radar detection distance: 0.3 m ~ 12 m | Price range: £224.45 through £254.38 ex VAT (£269.34 – £305.26 inc. VAT) | In stock, UK · dispatched within 14 working days |
| Milesight EM500-SWL Submersible Water Level Sensor EM500-SWL-868M | Measuring range: 0 ~ 3 m / 5 m / 10 m (customizable up to 200 m) | Price range: £251.38 through £272.33 ex VAT (£301.66 – £326.80 inc. VAT) | In stock, UK · dispatched within 14 working days |
| Milesight EM411-RDL Radar Distance/Level Sensor EM411-RDL | Ingress Protection / Hazardous-area approval: IP68 (1m underwater, 48 hours) + ATEX Zone 0, Ex ia IIC T4 Ga — EM411-RDL only | Price range: £314.23 through £321.71 ex VAT (£377.08 – £386.05 inc. VAT) | In stock, UK · dispatched within 14 working days |
| Milesight Water & Leak Monitoring Kit — Gateway + Level + Leak Sensors KIT-WATER-LEAK | — | £360.62 ex VAT (£432.74 inc. VAT) | In stock, UK · dispatched within 14 working days |
| Milesight EM500-SMTC Soil Moisture, Temperature and Electrical Conductivity Sensor EM500-SMTC-868M | Electrical conductivity measuring range: 0 ~ 20000 µs/cm | £371.09 ex VAT (£445.31 inc. VAT) | In stock, UK · dispatched within 14 working days |
| Milesight WTS506 IoT Weather Station WTS506-868M | Measured parameters: Six: temperature, humidity, wind speed, wind direction, barometric pressure, rainfall | £2,244.51 ex VAT (£2,693.41 inc. VAT) | In stock, UK · dispatched within 14 working days |
Brands in this kit: Milesight
Why Indiott
A specialist stack, not a box-shifter
Brand-agnostic by design
We pick the best of each brand for the layer and the environment, not one vendor catalogue. Milesight, AquaIoT, Atop, Browan, SpecSens and Urban.io, chosen on merit.
The whole stack, one supplier
Sensing, connectivity, OT security, control and the dashboard come from one accountable team, so there is no finger-pointing when something needs to talk to something else.
Specified and supported in Britain
UK-based engineers scope the site, quote the kit and stand behind it, with compliance mapped to the regimes your auditors actually cite.
Honest kit, honest pricing
Prices are shown where we can, quoted fast where we cannot, and you get a straight answer and a bill of materials within one working day.
DEPLOYED IN THE FIELD
Compliance this answers to
| Standard | What it requires |
|---|---|
| Flood and Water Management Act 2010 | lead local flood authority duties for local flood risk |
| Reservoirs Act and EA monitoring expectations where assets fall under formal supervision | |
| EU868 LoRaWAN and IP68-rated submersible sensing for permanent in-watercourse deployment | |
What it costs, roughly
A network of level sensors across a town's culverts and gulleys, with a solar gateway or two, is typically low thousands of pounds in hardware, set against the cost of a single flooding event in claims and response. This is close to the group's existing flood work in sewer pits. We price your catchment within one working day.
Frequently asked questions
Radar or ultrasonic: which level sensor should I use?
For open channels and clean conditions the EM500-UDL ultrasonic sensor (£202.01 ex VAT) or compact EM400-MUD (£86.79) resolve level to about a centimetre. Where foam, spray, debris or heavy rain defeat ultrasonic, the EM410-RDL 80 GHz radar sensor (£224.45) measures non-contact through weather. Both mount above the water so nothing sits in the flow.
How is a flood alert actually triggered?
Each sensor samples on a fixed interval and carries configurable thresholds. When level rises past a warning or action stage the sensor flags the reading and the platform raises an alert by email, SMS or webhook. Because reporting is minutes rather than a manual gauge board read on a site visit, the control room sees a rising trend early enough to act.
Do the sensors work off-grid on a remote watercourse?
Yes. The level sensors are battery powered for up to several years, and for the gateway a solar option removes the need for mains. The SG50 ultra low power solar LoRaWAN gateway is £683.83 ex VAT, and the IP67 outdoor UG67 gateway is £658.39 where power exists. One gateway covers several kilometres of open catchment.
Can I monitor a piped or pressurised system too?
Yes. For pipe and chamber pressure the EM500-PP pipe pressure sensor (£197.52 ex VAT) reports pressure and derived head, useful on rising mains and surcharge points. Combined with level sensors on gullies and attenuation tanks, you see both open-channel level and pressurised behaviour across a drainage or SuDS network.
What accuracy and range can I expect?
The ultrasonic sensors resolve distance to roughly a centimetre within their measuring range, and the 80 GHz radar sensor gives reliable non-contact level to several metres regardless of weather. Site the sensor with a clear cone to the water surface and away from ladders or pipework, and readings stay stable across the range.
Does it integrate with our telemetry or GIS?
Yes. The gateway forwards readings north over MQTT or HTTP into your telemetry, historian or GIS, so flood data sits alongside existing SCADA rather than in a separate portal. Thresholds and trends are available to the same operators who run the wider water or highways network.
Related
Buying this in the UK
- Supplied by Indiott, a trading name of PSI Technologies Limited (Companies House 03689664, VAT GB 730 2340 83), Hampshire, United Kingdom.
- Every price is published ex VAT at indiott.com — no quote needed to see it.
- Typically dispatched within 14 working days from the UK, on a VAT invoice.
- Call 023 9223 3611 or request a quote.
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Next step
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