Answers
Answers to the questions UK water teams actually ask
Short, sourced answers on drainage, flooding, metering and monitoring responsibility. Each one states the position first, then explains what it means for a site that has to operate the asset.
Written by the AQUAIOT engineering team. Every factual claim is referenced to a named external authority at the foot of the page.
Sewers, drainage and stormwater
What actually happens inside a foul or combined network, and how teams see it before a spill or a blockage becomes an incident.
What is infiltration and inflow in a sewer network?
Two different faults with two different signatures, and why the difference decides the fix.
Why does a manhole surcharge?
The four causes, and the level pattern that separates a blockage from a capacity problem.
Why do sewers produce hydrogen sulphide, and what does it damage?
Why rising mains are the worst offenders, and why your nose stops detecting it exactly when it matters.
What is a rising main, and why does it fail differently?
Pressurised, sealed and unwatchable. Why it bursts instead of blocking.
What is a wet well?
The chamber that buys you time when the pumps stop. Usually far less than people assume.
What is the difference between a combined and a separate sewer system?
Why only one of the two spills to a river when it rains, and why the UK is stuck with both.
What is ATEX Zone 0, and when does it apply to water assets?
The hour figures everyone quotes were never officially adopted. What actually governs the specification.
Flooding, levels and surface water
Where flood duties really sit, what the drainage rules require today, and how sites get useful warning instead of a phone call after the event.
Is SuDS Schedule 3 mandatory in England?
No, and a lot of published guidance says otherwise. The actual position, and what applies instead.
What is property flood resilience?
Resistance keeps water out, recoverability limits the damage. Both depend on warning time.
How does rain gauge telemetry work?
How a tipping bucket becomes an intensity figure, and why a gauge on site beats a regional forecast.
What is a culvert, and why do culverts flood?
The culvert is rarely the problem. The screen across its mouth usually is.
What is freeboard in a tank, basin or channel?
The safety margin nobody measures, and the one silt eats first.
What is tide-locked drainage?
Two ordinary events that only flood when they coincide.
Flow, metering and water loss
The metering questions that decide whether a water bill can be trusted, and what it takes to turn an existing meter into live data.
What is MCERTS, and does my site need it?
The certification scheme behind permitted effluent flow, and the uncertainty figure it holds you to.
What is the difference between AMR and AMI water metering?
One reads the meter. The other gives you interval data you can actually run alarms on.
Can you add a data logger to an existing water meter?
Usually yes, via the pulse output. What pulse weight means for what you can actually detect.
Does a fire sprinkler system need flow monitoring?
A pressurised main that should never flow is the easiest leak in the building to miss.
How accurate is a clamp-on flow meter?
The quoted figure is a laboratory number. What you get depends on the pipe.
How much straight pipe does a flow meter need?
Ten diameters upstream, five downstream, and why the number is not arbitrary.
How do you read a water meter with no pulse output?
No pulse output means nothing for a logger to count. The three routes that still get you a reading.
How is flow measured in an open channel?
The pipe is not full, so flow has to be derived. Two methods, and where each one quietly drifts.
Water quality and wastewater measurement
What the standard wastewater and water quality parameters actually mean, and what makes the numbers trustworthy or not.
What is ammonia monitoring in wastewater?
The parameter most likely to breach a permit, and the one spot sampling misses.
What is the difference between COD and BOD?
Both measure oxygen demand. One takes hours, the other five days.
What is a sonde in water quality monitoring?
One probe, several sensors, and two maintenance realities that decide if the data is real.
Telemetry, data and integration
How a reading gets from a sensor in a chamber to a screen somebody looks at, and the standards and signals in between.
Compliance and responsibility
Who carries the duty, what the guidance actually says, and where the common readings of it are wrong.
Who is responsible for a private pumping station?
A lot transferred in 2016. A lot did not, and the exceptions are where the surprises are.
Can the Legionella responsible person be an external contractor?
Yes, but the duty does not move with the appointment. Where the line actually sits.
Who is responsible for water safety in a rented building?
Control of the premises decides it, and control is not the same as ownership.
Not the question you came with?
Describe the site, the asset and what you need to see, and an AQUAIOT engineer will tell you what is practical to monitor and what it would take to deploy.
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