0191 5131313 | hello@siris.co.uk
0191 5131313 | hello@siris.co.uk




At SIRIS we are driven by innovation and continuous improvement in our products and processes.  Flumes are no exception, with this component being an integral part of the SIRIS product portfolio and many flow monitoring system solutions. 



Flume Innovations

Our team has been listening hard to the ongoing needs of clients and modern-day flume requirements and we have consequently implemented two innovations to our range of flumes.

A New, Deeper Flume Option

During a routine post-installation verification check, one of our experienced project engineers quickly identified issues within this flow meter installation. It rapidly became apparent that the third-party contractor had not installed the meter correctly, meaning that incorrect measurements were pulling through to the data feed.

Our engineer was able to recognise that the Sensorprom (the part of the flow meter sensor that carries the unit calibration value) had not been installed correctly and had defaulted to factory settings. This included the incorrect bore size, the calibration (cal) factor and the excitation value.

During our initial response our engineer was able to adjust and reset the flow meter to the unique original Sensorprom characteristics. On adjustment the meter significantly changed its flow reading and this was checked against a secondary time of flight reference.



Boxed Flumes

We now offer our flumes in protective boxed packaging. This means that they are better protected against damage and the elements, as well as being kept secure during transit. 


The hardwearing purpose-built boxes protect the flumes against knocks and scratches and even have a built-in tarpaulin to allow safe storage on site in wet weather conditions.


Our SIRIS boxed flumes are available in a range of sizes and are in stock for immediate delivery.


We are encouraging our customers to return the boxes to SIRIS to be re-used and help reduce our environmental footprint. Instructions explaining how to arrange the return of the box are included in all shipments.

Lee, Project Engineer

We are always seeking to innovate and respond to our client needs.  These two new additions to our flumes range allow us to further improve our service offering to the market.  We are proud of our team here – there is a natural curiosity to investigate possible solutions and find new answers to existing challenges.  This is what helps us to stay at the forefront of our industry.”

Require flumes or full flow monitoring system?

Our team has the solution for you. Talk to us today.

EDM: Event Duration Monitoring 101


Event Duration Monitoring 101

+ FREE downloadable EDM infographic!

Event Duration Monitoring (EDM) continues to be a hot topic in the water industry. In this article we’re diving in to the nitty gritty of EDM and explaining what it means for the water industry. 


Find out:


  • What is EDM?
  • Why is everyone talking about it?
  • What WINEP is
  • What EDM means for FFT and MCERTS
  • How we can help
  • Plus download our free EDM infographic.

What is Event Duration Monitoring (EDM)?

In order to explain Event Duration Monitoring (EDM), we first need to understand how water treatment works operate. Combined sewers carry wastewater from homes and businesses, however they also collect rainwater which falls onto areas like streets and roofs.

In normal conditions this water travels to a wastewater treatment works to be treated before it is discharged back to rivers and streams.

However, during a weather event (i.e. a storm or extremely heavy rainfall), water companies are permitted to use storm overflows, which are designed to store wastewater until the treatment works has capacity to treat it, or discharge the diluted wastewater back to the water course, known as a “spill”. This is essential, as otherwise untreated water would back up through the sewage system and flood homes and businesses.

EDM data measures the frequency and duration of spills from these storm overflows. This is important because the Environment Agency needs to closely monitor the amount of untreated wastewater that is entering rivers and streams and ensure water companies are keeping within their FFT limits

Why is everyone talking about EDM?

In many areas the UK’s sewer system is no longer fit for purpose. In many cases sewage treatment works simply weren’t built to treat the volume of flow they now need to accept. This is a result of population increases as well as changes to weather patterns caused by climate change.


In practice, this has resulted in many sewage treatment works relying on storm overflows on a regular basis, instead of just during the storm events they were designed for. If a storm overflow is already full and a period of heavy rainfall occurs, it will not be able to cope with the additional flow and will discharge a higher volume of wastewater to the environment than it would have done if the overflow had been empty to start with. 


If this goes unchecked, the UK’s rivers and streams will continue to be polluted with untreated sewage and could have serious consequences for our environment. In recent years the Environment Agency has taken steps to mitigate these risks and force water companies to monitor their use of storm overflows and invest in their infrastructure in order to meet their environmental obligations.  


The Water Industry National Environment Programme (WINEP) is a programme of actions water companies are required to take to meet their statutory environmental obligations, non-statutory environmental requirements, or delivery against their statutory functions. In short, it’s the steps they need to take to help improve our environment.


The Government has challenged the UK’s water companies to create an industry that:


  • “provides resilient, safe, and affordable water supply and wastewater service for today’s users and future generations
  • provides a thriving natural environment with increased environmental value, clean rivers and a sustainable eco-system
  • consumers trust and delivers an excellent day to day service, support for vulnerable consumers and acts in the long-term interests of society and the environment”

The Environment Agency, Department for Environment, Food & Rural Affairs (DEFRA) and Water Services Regulation Authority (OFWAT) have jointly developed an overarching process for delivering this programme in England.

WINEP aligns with OFWAT’s findings from PR19, its five-year price review and service package. Under PR19 water companies are required to begin monitoring FFT and storm events in order to achieve MCERTS compliance.


These are mentioned under two main drivers:


  • U_MON3
    Install EDM on WwTW overflows to storm management systems at WwTW and at last in line overflows at sewage pumping stations.

  • U_MON4
    Install MCERTS flow monitoring as close to the overflow as practicable to record FFT at WwTW where the existing DWF MCERTS flow monitoring, or other installed flow monitoring, cannot be readily used to confirm the permitted FFT setting is being complied with when the overflow to the storm management system operates.

What does EDM have to do with FFT?

Flow to full treatment (FFT) is the maximum flow a sewage treatment works can treat. It is calculated by multiplying the dry weather flow (DWF) by three. FFT is important when carrying out EDM because it allows us to cross reference the two numbers for more accurate results.

What does EDM mean for MCERTS?

Under U_MON4, it will be a requirement for MCERTS flow monitoring to be installed to record FFT. We need to incorporate EDM to record this accurately.


Data from EDM is used in conjunction with flow data to identify whether the works is meeting its permit conditions for FFT, so it is important that the EDM data is sufficiently robust to support this assessment.


Learn how EDM works

Download our free infographic to understand how Event Duration Monitoring works.

EDM infographic

How can SIRIS help?

As with any flow measurement device, EDM needs to be set up and calibrated by a qualified MCERTS inspector to ensure it doesn’t trigger too early or not at all.


For support with installing an FFT or EDM system on your site, please contact our expert installations project team who will be able to offer you advice and support on choosing the right system.



Which wastewater analysing equipment is right for me?


Which wastewater analysing equipment is right for me?

Our guide to wastewater analytics.

The majority of businesses producing wastewater are required to carry out wastewater sampling to comply with their consent to discharge permit requirements. In most cases, an automatic effluent sampler is the most suitable option for accurately and reliably meeting sampling requirements. However, for some businesses additional analytical equipment can be helpful.


In this guide we’ll explain:


  • The main types of wastewater analysing equipment
  • How to choose the right equipment for your business
Wastewater samplers

Wastewater samplers are designed to automatically collect samples of wastewater and trade effluent via a hose at regular pre-programmed intervals. A thermoplastic unit keeps the samples at the optimum temperature. This is important as effluent contains Biological Oxygen Demand (BOD), which must be kept cold in order to be effectively measured. Automatic samplers are connected to a site’s wider flow measurement system and can function either independently or as part of an existing PLC/SCADA system.


There are two types of wastewater sampler – vacuum and in-line (guillotine). The version you need will depend on whether you have an open channel or closed pipe application.


Find out more about SIRIS wastewater samplers.

Photometers & spectrophotometers

Businesses with larger sites or that require more detailed information on their wastewater status may benefit from additional analytical equipment.


Hand-held photometers and spectrophotometers offer a convenient way of conducting instant wastewater sampling analysis. They offer a range of testing options and pre-programmed tests, giving an immediate picture of wastewater analyte levels and understand how well you are meeting parameters within your consent to discharge. Results are instant which means you can check vital information on compliance and potential trade effluent costs without waiting for lab results.


This can be beneficial because factors such as products changes, new on-site processes and seasonal temperature variations can all have an impact on the quality and analyte levels within trade effluent. Having a portable device on-site is a quick and simple way to check analyte levels without the need for specialist laboratory equipment.


Find out more about our photometers and spectrophotomers.

In-line monitors

In-line monitors are a good option for businesses that need to track specific analytes such as pH and turbidity in their wastewater, and provide a more affordable option than a photometer or spectrophotometer.


Depending on the nature of the business,  you may be required to test the following physical properties by MCERTS:


  • Temperature
  • pH
  • Salinity
  • Turbidity
  • Colour/odour


At SIRIS, we supply the Partech 7300w² Monitor, which is a great option for monitoring a range of values, comfortably accommodating up to eight sensors, with additional sensors a possibility depending on site capacity.


The 7300w² Monitor can be paired with sensors monitoring pH, temperature and turbidity, so it’s possible to pick and choose as required.


Find out more about in-line monitors.

Partech partner

Our status as a Partech sales and service partner allows us to offer a range of analytical measurement devices, enhancing our service offering and giving our customers additional wastewater monitoring options. We can supply, install and maintain a range of Partech products and offer ongoing support to our customers.

Wastewater analysis data monitoring

In addition to on-site sampling and analytical equipment, many of our customers also opt to add on a Cloud-based data monitoring to their wastewater analysis package. Having the ability to track your site’s effluent discharge provides peace of mind and confidence that you are staying within your limits – as well as allowing you to see if you are paying too much.


Our data monitoring system uses a data visualisation suite paired with a specialist remote telemetry unit (RTU) to provide businesses with 24/7 access to their data, from anywhere with an internet connection.

How can you make sure you choose the right wastewater analysing equipment?

Wastewater analysis is a highly complex and confusing area, and it can be difficult to navigate the various options available. It’s essential you consult experts to ensure the system you choose is fit for purpose and cost-effective. Choosing the wrong products can be a costly mistake and there are a number of factors which can push the price up further, including poor installation practice and a lack of expertise from your supplier.

Ultimately, a correctly installed system supported by a team of experts is the only way to be sure you are getting a cost-effective and reliable system.

In addition to our range of MCERTS-approved wastewater samplers and analytical measurement tools, at SIRIS we offer comprehensive support and guidance to help you choose the best option for your site.


MCERTS flow measurement: Why it’s essential to consult the experts


MCERTS flow measurement

Why it’s essential to consult the experts

We often get calls from customers requesting quotes for part of a flow system – and they’re often surprised when we explain that it isn’t as simple as just selling them a flow meter.


In this article we explain why installing any MCERTS flow measurement system requires a holistic approach, and the importance of consulting the experts to ensure your system is not only cost-effective but fit for purpose.

“Why do I need to look at the whole system? I just need a flow meter.”

It’s something we hear often. A customer already has a legacy system in place and just wants to replace a small part of it. The problem is, it’s not always that easy.


Over the years our servicing and installation engineers have seen hundreds (if not thousands!) of flow measurement systems, and a surprising number of them simply aren’t fit for purpose – and likely never have been.

While we could just sell you the component you ask for, there’s no guarantee that it will be suitable for your existing system – and more importantly, no guarantee it will pass an MCERTS inspection. Ultimately, making the wrong choices can end up being a very costly mistake for your business.


How MCERTS flow measurement experts can help

We ask the right questions

There are several key questions we need to consider when installing part, or all, of an MCERTS flow measurement system:


  • Is the component suitable for the existing system? Understanding the type of flow measurement system is essential to choosing the right components. For example, a state-of-the-art electromagnetic flowmeter might sound like the best choice, but it’s not going to be very useful fitted in to an open channel drain or close to an aeration treatment plant and thus effected by entrained air.
  • Can the system be calibrated and future-proofed? If the existing system has been incorrectly installed from the start, new part isn’t going to solve the problem and we can’t effectively validate the system.
  • What is the nature of the discharge? We often get asked for a specific type of flow measurement, for example a V notch weir. However that isn’t a very effective method if the discharge contains significant solid content and can blind the V.
  • How has the flow measurement system been maintained? Poorly maintained equipment is one of the most common issues we encounter when visiting sites and is a leading cause of incorrect readings.
  • Is the flow measurement system suitable for your site? There is no one-size-fits-all solution when it comes to flow measurement. It’s essential to get a thorough understanding of the site the system is for to ensure it is fit for purpose. Factors such as available space, flow volumes and permit conditions are all important considerations.

We make sure your system is correctly calibrated

Regular flow meter calibration is essential for ensuring your device continues to provide accurate results. Not carrying out this vital process can result in your flow meter recording incorrect data and could result in a failed MCERTS inspection, or incorrect charging from your water utility provider.


When we install a new flow measurement system we always ensure it has been correctly calibrated. We also ensure that any flow measurement system we install has been designed to allow for future in-the-field calibration.

We guarantee MCERTS compliance

Choosing an MCERTS-accredited product doesn’t mean the flow system will automatically pass an MCERTS inspection.

We guarantee that any system we design, install, and maintain will be fully MCERTS-compliant – giving you the peace of mind that your system is providing accurate, cost-effective results and ensuring ongoing compliance with Environment Agency regulations.

We ensure the right data monitoring is in place

Data monitoring allows you to gather crucial flow meter data and ensure you are satisfying regulatory compliance for your water authority, as well as environment agencies in both England and Scotland.


Our cloud-based system offers a robust and reliable ‘plug-in and play’ option for wastewater flow monitoring using a specialist remote telemetry unit (RTU) and data visualisation suite, Palette.

Our bespoke Palette system allows you to monitor your effluent discharge from anywhere, at any time. Our cloud-based software gives you 24/7 access to your data, giving you the ability to get the information you need, whenever you need it.


Find out more about our data monitoring solutions.


For any queries or assistance with your flow measurement system, please contact our expert installations project team who will be able to offer you advice and support on choosing the right system for your site.


What is wastewater analysis?


What is wastewater analysis?

Wastewater sampling: what is measured and why?

The majority of businesses producing wastewater are required to carry out wastewater sampling to comply with their permit requirements.


Often this will be via self-monitoring, however companies may find themselves the subject of spot checks of their samples by the local water company to ascertain composition and volume of trade effluent produced. This supplied information is important as water companies use it to calculate final water treatment costs, using a method known as The Mogden Formula.

Wastewater analytes

What is being measured?

The full spectrum of analytes covered by MCERTS is listed in the Environment Agency standard Performance Standard for Organisations Undertaking Sampling and Chemical Testing of Water.

This is the standard businesses should refer to when implementing their effluent sampling processes as it details business requirements for the sampling and testing of trade effluent.

The most common analytes businesses are required to test by MCERTS are:

Physical properties

Physical properties analysed during wastewater testing include:

  • Temperature – Discharged consents are sometimes waived when the temperature drops below 4ºC so it’s important to conduct accurate temperature monitoring to avoid regulatory issues
  • pH – Monitoring acid/alkaline levels in water is important to ensure there is no impact on aquatic life. Even small changes to pH levels can have catastrophic results
  • Electrical conductivity (salinity) – Conductivity measures the ion capacity of liquids to carry electrical current. The reason we measure this is because higher conductivity generally means there is a higher ion concentration from dissolved salts
  • Turbidity – Turbidity refers to the clarity of the effluent. Although it is technically a measure of how cloudy the liquid is, often the particles are invisible to the naked eye which is why specialist equipment is required
  • Colour/odour – Hazen colour and odour checks can be an important verification tool to check against other physical properties  

Dissolved oxygen (DO) in water is essential to the survival of aquatic life.

In wastewater sampling, the BOD (biochemical oxygen demand) and COD (chemical oxygen demand) of effluent are measured to ensure water course DO levels will not be impacted by its discharge.


BOD measures the biological oxygen demand over a five-day period and equals the amount of dissolved oxygen required by organisms for aerobic decomposition of organic matter present in the water.


COD refers to the mass concentration of oxygen equivalent to a specified oxidant consumed by dissolved or suspended matter when a water sample is treated with that oxidant under defined conditions.


The level of solids in wastewater affect its quality and how it needs to be treated going forward.

Solids measurement differs from turbidity in that TSS measures the actual physical particles in the water (e.g. sediment) whereas turbidity measures the effect on light caused by particles. Solid measurement is split into:


  • TSS (total suspended solids) measures the dry weight of particles suspended (undissolved) in the sample. A high level of TSS allows water to absorb more light, increasing water temperature and reducing dissolved oxygen (DO), which can have a negative impact on aquatic life

  • TDS (total dissolved solids) – effluent with a high level of TDS can contain high concentrations of salts, making it unsuitable for irrigation or industrial reuse

An excess of nutrients in water contributes to algae overgrowth. 

Nutrient measurement is important as too much algae in water uses high amounts of nitrogen and phosphorus and results in the production of neurotoxins that are harmful to animals and may contaminate future drinking water.

Typically measured nutrients include:


Trade effluent from industrial processes is a primary source of heavy metal contamination.

Industries including textile, paper/pulp and metal finishing are all contributors, producing effluent that contains the “top four” toxic heavy metals arsenic (metalloid), cadmium, lead and mercury as well as chromium, nickel and zinc which are also toxic to humans and animals.

what is wastewater analysis sampler picture
What is wastewater analysis?


Next steps

The above list is not exhaustive, but contains some of the common analytes permit holders are required to be measured on. It may seem like an overwhelming task, but a good automatic wastewater sampler and associated monitors provide an accurate and user-friendly solution.

SIRIS offer a comprehensive range of MCERTS-approved wastewater samplers and analytical measurement tools designed to simplify the wastewater analysis process.  


For any queries or assistance with your trade effluent sampling or flow measurement, please contact our expert installations project team, who are set to help with any effluent challenge.


What is the Mogden Formula and why does it matter for trade effluent?


The Mogden Formula

Calculating Trade Effluent Charges

This rather complex-looking equation represents the key tool in calculating trade effluent charges.  Termed The Mogden Formula after first being adopted at the Mogden Water Works in London, it incorporates a number of variables such as contaminant and suspended solids levels that are used to calculate the final treatment cost per m3 of the effluent. 


The formula can be broken down as follows:


R = the charge from the water treatment works for receiving and conveying the effluent (in £/m3)


V = the charge from the water treatment works for the primary treatment* of the effluent *removal of material that will either float or readily settle out by gravity

(in £/m3)


Bv = the charge from the water treatment works for any biological* treatment (in £/m3) *breakdown/decomposition of organic contaminants from the wastewater


M = the charge from the water treatment works for the treatment and disposal of any effluent that must go out to sea (in £/m3)


B = the charge from the water treatment works for the biological oxidation* of any settled sewage (in £/m3) *B-stage, or bio-oxidation stage, where remaining organic material in low-loaded activated sludge is biodegraded


Ot = the chemical oxygen demand (COD) of effluent after one hour of quiescent settlement at pH 7 [mg/litre]


Os = the chemical oxygen demand (COD) of effluent after one hour of quiescent settlement [mg/litre]


S = the charge from the water treatment works for the treatment and disposal of the primary sewage sludge (in £/kg)


St = the total of suspended solids of effluent at pH7 (in mg/litre)


Ss = the total of suspended solids of effluent (in mg/litre)

what is the mogden formula

The more contaminants and suspended solids in the wastewater or effluent, the more expensive it will be to treat and dispose of.  This is known as The Trade Effluent Charge and is charged by the local water company to cover costs associated with the transportation, treatment and disposal of the effluent.


Many companies use water as part of their processing, such as produce cleaning or cooling, and understanding your Mogden formula can help identify areas to reduce wastewater processing charges.  Essentially there are two ways to do this:


–       Reduce the levels of contaminants/solids within the effluent

–       Reduce the volume of effluent

Water companies will issue licences of “Consent to discharge trade effluent” to those companies producing effluent for public disposal, which will outline specific conditions and charges for your licence.  The consent licence will stipulate how the wastewater must be monitored (or measured).  Sometimes this will be through self-monitoring but the water company may also routinely monitor flow and composition of the effluent to ensure compliance and estimate charges.   Water companies may vary in their application of the Mogden formula, but this information will be publicly displayed on their website, in line with the OFWAT regulator. 


Having an accurate and reliable picture of your effluent data is therefore key in ensuring the correct charges are being paid, as well as understanding where costs are coming from within the variables.  This is done via two primary methods – wastewater sampling and wastewater flow measurement. 

A Siris Effluent Sampler

Role of Effluent Sampling

An accurate base for calculations

Effluent sampling ensures the accurate measurement of those variables used within the Mogden formula.  Without them, calculations may be based on estimates, which could be bringing unnecessary additional charges to the business.

Investing in an approved, on-site wastewater sampling system gives more comprehensive and ongoing accurate data that can be used to monitor the quality of the wastewater discharge on a continual basis, using composite samples to provide data to the EA and local water authorities that can reduce charge liabilities and business costs.


At SIRIS we offer a range of MCERTS-accredited wastewater samplers that suit both open channel and closed pipe applications, providing robust and long-lasting sampling solutions for a range of industrial and commercial businesses.  We offer automatic, composite, refrigerated sampling, which ensures regular samples of your effluent at key times e.g. high loads/low loads.  Factors such as this are important and carefully considered in the design and specification of your effluent monitoring system by the SIRIS team.  For example, water company spot samples may focus on times of high contaminant concentration, giving an inaccurate picture of the average effluent strength level and causing unnecessary charges.  The refrigerated element of our samplers ensures that samples do not degrade.,


Role of Flow Measurement

Ensure a true picture of volume of effluent


Measurement of volume of flow is another critical data point in which to ensure accuracy.  Again, on-the-spot water company measurements can give biased flow volumes, for example if these were taken only during high production points on the plant. 


Our solutions ensure an accurate picture of flow volume over time.  Depending on the specific business type and requirements, effluent flow may be measured on either an instantaneous or continuous basis, each of which requires careful specification of equipment. At SIRIS, our experienced approach to effluent flow measurement allows us to specify and develop robust and reliable measurement systems.

MCERTS Certification
Learn how we saved one client over £170,000 through accurate effluent monitoring


For any queries or assistance with your trade effluent sampling or flow measurement, please contact our expert installations project team, who are set to help with any effluent challenge.


Proud to be supply chain partner of award-winning Wolsingham Sewage Treatment Works Growth Improvement Project

SIRIS proud to be supply chain partner of award-winning Wolsingham Sewage Treatment Works Growth Improvement Project

The whole projects team at SIRIS is proud to have been a recognised supply chain partner in the award-winning Wolsingham Sewage Treatment Works (STW) Growth Improvement Project.  Completed in 2021 during the height of the pandemic, the £6m project has been awarded Civils Project of the Year in the Constructing Excellence in the North East Awards.

Led by Tilbury Douglas (contractor) and Wood (designer) for client Northumbrian Water, the project was recognised for its use of new technology, implementation of off-site, sustainable construction methods and best-in-class collaboration between all project stakeholders


The Project

An upgrade to tackle increased flows and asset deterioration

The Sewage Treatment Works was in need of an upgrade as demand on the site had increased in line with population growth in the area, estimated at some 19%.  The upgrade project had to identify solutions to the issues caused by increased flows and loads identified at the site and the related impacts on associated sewerage networks.  In addition to this, further work to tackle asset deterioration and ongoing pollution incidents due to sewer overflow was to be incorporated into the project. 


The design phase of the project, started in 2018, took an innovative “Off-site by Default” and DfMA (Design for Manufacture and Assembly) approach to build technology, an ethos that was mirrored throughout all phases of the project with the ongoing support of client Northumbrian Water.  The Sewage Treatment Works was consequently able to be built using off-site build methodology, a ground-breaking approach within the water industry. 

This method brought tangible and sizeable benefits to the project in terms of reduced costs, timelines and environmental impact; with some £1m pounds, 4 months and 34 man hours estimated to have been removed from the project initial budgets and timescales. 


Northumbrian Water now plans to adopt the new off-site build approach within their AMP7 framework, a real testament to the success of the project and the collaboration of partners and supply chain throughout. 

Picture courtesy of Tilbury Douglas
Early phase drawing of the inlet flume design The inlet flume, manufactured off-site and installed into the inlet works Picture courtesy of Wood https://www.woodplc.com/
Add Your Heading Text Here


Off-site Build Concepts

Working under the brief of design partners, Wood, SIRIS was able to develop off-site build concepts for the inlet of the works, using a prefabricated, above-ground approach.  The inlet-flume design was built offsite within the SIRIS on-site factory, using non-standard GRP-reinforced, welded PVE construction materials to give the increased accuracy and sensitive tolerances expected for MCERTS certification.  The materials also benefited from a service life of up to 50 years.    

Transported in two sections, the inlet flume was installed readily into the SWT without problem, showing the potential for future off-site build methods for installations of this type.



“The off-site construction nature of this project represented a new approach in the water industry.  With our on-site factory and engineering team, we were able to quickly integrate into the adopted working methods by providing a fully constructed inlet flume and weir system, then transported to and installed on the works site directly.  Our team collaborated fearlessly with the project team to achieve all requirements and we are proud to have been involved in such an innovative development.”

Here at SIRIS we are able to work with our clients flexibly and in line with individual project requirements.

Working with varying client types, including water companies and trade customers, we design, construct and install reliable and accurate flow measurement and sampling installations for use with trade effluent and wastewater.

Guide to Critical Depth Flumes Video

Simon from our Sunderland Head Office took some time to explain the basics of flumes in our guide critical depth flumes and how best to maximise use of their functionality.


Using our flow measurement test rig, our instructional video guide to critical depth flumes covers:

  • What is a flume?
  • Common flume mistakes
  • Approach length
  • Ability of the flow to exit the flume
  • Maintenance of flumes
  • How do we measure flow in a flume?
  • Flumes and Flow to Full Treatment


This instructional video guide is ideal for anyone looking to enhance their knowledge and understanding of flumes.  Simon is a senior member of our expert MCerts-qualified team and can help businesses and individuals with their water sampling and flow measurement requirements.  Contact us if you need more detailed or tailored guidance.