unidirectional flushing Archives

A Culture Guided by Gratitude

As the days grow shorter and the air turns crisp, November offers a gentle reminder to pause and reflect. At Tata & Howard (T&H), this season is a time to express gratitude for the people and partnerships that support us and to recognize the essential work that keeps our communities thriving. Gratitude is at the heart of what we do, inspired by our deep appreciation for the vital natural resource we work every day to protect — from maintaining clean, reliable water systems to fostering a company culture grounded in collaboration, respect, and shared purpose.

This month, we’re embracing a “Month of Gratitude,” a celebration that acknowledges the human and technical sides of what we do. While Thanksgiving often sparks intentional reflection, our gratitude extends far beyond a single holiday. It’s a chance to highlight the unsung heroes, the behind-the-scenes processes, and the people who make our mission possible every day.

Behind the Tap

When people turn on the tap, they rarely think about what it takes to make that possible. At T&H, we’re grateful for not just the systems that deliver clean, safe water to every home and business, but for the dedicated teams who make it happen.

For example, something as routine as unidirectional flushing plays a crucial role in maintaining water quality. This process clears out sediment and improves system performance, keeping distribution networks running smoothly and giving our communities confidence in their water supply. While it’s easy to overlook these technical acts, they represent the behind-the-scenes dedication that defines our industry.

Being grateful for our community’s water infrastructure may sound unusual to most people, but for us, it’s about valuing the systems that keep us healthy and thriving. Each hydrant test, water main replacement, and treatment plant upgrade is a testament to intentional foresight and teamwork. While these efforts often take place behind the scenes, they ensure that clean water remains one of the most reliable and trusted public services.

Our People, Our Strength

Of course, our gratitude isn’t limited to just pipes and pumps. It also extends to the people who design, build, and maintain these systems, along with the communities that place their trust in us. Our ownership team exemplifies what it means to lead with integrity and shared responsibility. As an employee-owned company, T&H’s success is a collective achievement powered by a team that takes personal pride in its work. This culture of ownership strengthens our organization and also deepens our gratitude for one another.

Throughout November, we also reflect on the many relationships that shape our work. We’re thankful for our clients, whose collaboration and trust allow us to pursue meaningful solutions. We’re grateful for our partners who share our commitment to quality and sustainability. Most of all, we’re thankful for our colleagues — engineers, scientists, technicians, and support staff — who bring creativity, dedication, and heart to every project. Together, we build something greater than the sum of our parts.

Our gratitude also extends beyond our immediate circle to the communities we serve. Whether we’re improving water systems in a small town or enhancing infrastructure for a growing city, we’re reminded that our work has a lasting impact on people’s lives. Knowing that our efforts help ensure safe drinking water for families, schools, and businesses is profoundly rewarding. It’s what motivates us to innovate, collaborate, and keep learning.

Gratitude in Action

This “Month of Gratitude” also reminds us that appreciation and stewardship are interconnected. As we give thanks for the systems that sustain us, we also recognize that our responsibility to care for them goes hand-in-hand. It’s critical to remember that sustainability is not just a professional focus but a moral commitment. By promoting efficient water use, investing in resilient infrastructure, and adopting environmentally conscious practices, we express our gratitude through action, ensuring future generations inherit the same resources and opportunities we enjoy today.

Small Acts, Big Impact

Internally, our culture of gratitude shows up in a number of ways: in morning conversations over coffee, mentoring between colleagues, and shared pride when a project is complete. It’s in celebrating milestones and the collective support when faced with challenges. We believe that gratitude creates connection, and connection strengthens our ability to serve.

As we reflect on this month, we’re reminded that gratitude doesn’t have to be grand to be meaningful. Sometimes it’s as simple as appreciating the clarity of a well-maintained water line, the dedication of a field crew in challenging weather, or the innovation sparked in a brainstorming session. Other times, it’s about recognizing the values that guide us — collaboration, quality, and service — and the people who embody them each day.

Guided by Thanks

At T&H, gratitude is more than a seasonal sentiment. It’s a guiding principle that shapes our relationships, informs our decisions, and inspires our ongoing commitment to excellence. As we move through this month of reflection and thanks, we’re reminded that every drop of effort matters, from the precision of an engineering design to the trust of a lasting partnership.

So, this November, we pause to say thank you to our colleagues, clients, partners, and communities. We’re grateful for your trust, your collaboration, and your shared vision for a sustainable future. Together, we will continue to protect our most vital resource and the people who depend on it.

Fall is the Ideal Time for Unidirectional Flushing

Fall is the time for pumpkin spice lattes, football, apple picking…and unidirectional flushing.

Yes, you read that correctly.

Unidirectional flushing, also known as UDF, is a method used in water distribution systems where water flows in a single direction through specific pipe sections in order to mitigate contamination, preserve existing infrastructure, and more. But what does that have to do with the fall?

Before we get to that, let’s refresh on how UDF works and why it is so important, not only to our water distribution systems but to our health as well.

How it Works

Hydrant flushing’s primary goal is to maintain water distribution systems’ cleanliness and integrity by flushing sediment, biofilm, rust, and other debris (known as tuberculation) build up from within the pipe’s walls. In both conventional and UDF flushing, water travels from the tank to a hydrant in order to “flush out” pipes. But that’s where the similarities end. Conventional flushing allows water to freely flow in both directions through distribution pipes, allowing contaminated water to flow through pipes. Conversely, UDF forces water to flush in only ONE direction by closing valves, which results in higher velocities in the distribution system — and cleaner pipes in the end. For a clear visual of just how UDF works,take a look at this diagram.

Efficient and Effective

With UDF, water is moving in one direction, which means the velocity is significantly higher than conventional flushing, allowing it to remove any tuberculation along the way. Due to this increased pressure and speed, it’s easy to assume that that means more water is being used with UDF.

Quite the contrary, actually.

In fact, UDF uses approximately 40% less water than conventional flushing, meaning it gets the job done without being wasteful. This is crucial as populations continue to increase and as climate change affects more of our resources, increasing demand on an already struggling supply. UDF can provide utilities with a more cost-effective and sustainable method to maintain, improve, and prolong this precious resource.

Preserving Aging Pipes

Our country’s water distribution infrastructure is in dire need of repair and replacement, especially since a lot of it utilizes lead pipes. As our pipes age, they are far more susceptible to tuberculation, which can lead to blockages, reduced water quality, increased pressure on the system, and the transportation of waterborne diseases.

By directing the high-velocity water to flow through the pipes in a controlled manner, UDF removes tuberculation, reduces the strain on our already aging infrastructure, and prevents the accumulation of harmful substances that can speed up wear and tear. With UDF, municipalities and water utilities can delay the need for costly replacements, deliver a more reliable supply of clean water, and extend the lifespan of their existing infrastructure (even if it is aged).

Guarding Against Waterborne Threats

Waterborne diseases, such as cholera, dysentery, and typhoid, can be transmitted in a variety of ways: skin-to-skin contact, inhalation, and ingestion. They can form from both human and animal feces, toxins from microorganisms, chemical contaminants, and more. What’s most terrifying is that if they make their way into our water distribution systems, they have a fast-track ticket to anywhere and everywhere.

UDF helps municipalities mitigate contamination by keeping distribution pipes clean and free from debris.

Fall’s Perfect Timing: Why UDF Matters Most in the Heat

So, what does all of this have to do with the fall?

Fall is an ideal time for UDF because the summer weather leads to an increase in water usage. This spike can not only exacerbate tuberculation in our water distribution systems, but the higher temperatures can also expedite microbial growth. Both contribute to the higher chance of potential water quality issues, like wasted resources and lower supply, higher costs for residents, waterborne diseases, and more wear and tear on our infrastructure.

Conducting UDF in the fall allows municipalities to address these concerns proactively by clearing out the buildup and contaminants that accumulated over the summer (and year!). Additionally, the (generally favorable) weather conditions reduce the risk of complications that normally come with New England’s freezing or extreme cold, making UDF more efficient and effective. This method of seasonal maintenance ensures that the water supply remains clean and safe directly after a time of peak consumption.

Schedule Your UDF

At Tata & Howard, our UDF programs have been implemented across the Commonwealth, ranging from Shrewsbury to Wayland, Melrose to Haverhill, along with parts of Connecticut. By adopting a UDF program, municipalities can provide their customers with a water distribution system that lasts longer, saves resources and funds, and provides residents with the clean drinking water they deserve.

For more in-depth information on the benefits and functions of UDF, we have a free download of our whitepaper, Unidirectional Flushing Programs: A Yearly History Lesson Whitepaper. You can also take a look at past T&H projects to help get a better understanding of the process and our capabilities.

To further discuss UDF or schedule your cleaning, reach out to us here.

The Value of Unidirectional Flushing

In layman’s terms, unidirectional flushing is water flowing in one direction: a one way traffic lane for your local water distribution system. And the process is, for the most part, as simple as that.

To elaborate a bit more, unidirectional flushing, otherwise known as UDF, is an annual process used to aid and maintain water distribution systems like the one in your local area that provides your drinking water. We at Tata & Howard designed UDF programs specifically to remove unwanted tastes, odors, and discoloration in a water supply, to flush out bacteria and tuberculation that has built up, prolong the life of pipes and hydrants, allow for technicians to locate broken valves and hydrants, and to further pinpoint other water quality and supply issues.

Bye, Bye, Bacteria

What does flushing water in one direction have anything to do with preventing water-borne disease? For starters, let’s examine the diagram below of a water distribution system that utilizes conventional flushing.

As shown in the diagram, clean water is flowing from the tank into the water distribution system but is met with the free-flowing sediment and rust-mixed water from every direction. The direction in which the water flushes is crucial because the one-way water flow keeps the tainted water separate from the clean water, unlike the conventional flushing pictured above. With this method, sediment, microbial bacteria, corrosion, etc. are not circulated in the clean water, therefore preventing it from making into your next glass of water.

Since tainted water isn’t being fully flushed out in conventional flushing, sediment, rust, and microbial bacteria are building up within some of the pipe’s walls. This build up, or tuberculation, can negatively affect how much water can be distributed.

Under Pressure (Washing)

A great component of UDF is that the water is flushed throughout the distribution system at a higher velocity. If the water rushing down these pipes is at a higher velocity, that means tuberculation that has built up in the pipe’s walls will wash away, too. Picture it like your water distribution system’s very own water pressure system, blasting away microbial and rust buildup, and tossing it out with the rest of the bath water.

In Municipal and Sewer and Water Magazine, Shrewsbury, MA water and sewer superintendent — and Tata & Howard client — Dan Rowley states that when fire hydrants are opened to increase the water velocity, it “increases to 5 to 10 feet per second, compared to 1 to 3 feet per second in conventional flushing.” With that kind of power, tuberculation doesn’t stand a chance.

Now, when some people think of ramping up the speed dial on something, they think more power equals more resources, but that’s not the case here. UDF uses upwards of 40% less water than conventional flushing. A higher population to serve brings a higher water demand, which leads to a lower supply due to demand and climate change. All of this then results in a crucial need to seek out the most cost-effective and sustainable methods in order to maintain, improve, and prolong our planet’s natural resources. And UDF does just that.

Improve System Performance

During the unidirectional flushing process, valves are opened and closed to maintain a unidirectional flow. In the process, broken and closed valves as well as nonfunctioning hydrants are identified. Not only are you cleaning the water pipes during the UDF process, you are also identifying critical system components such as valves and hydrants that need replacement or maintainance.

Regardless, any water distribution system needs flushing. So why not perform it in such a way that you can simultaneously flush our tuberculation and bacteria from your pipes’ walls, prolong the quality of your valves, hydrants and pipes, use less water, and also improve overall water quality and quantity issues? This is one of those win-win situations!

At Tata & Howard, our UDF programs are implemented all over Massachusetts, ranging from Shrewsbury to Wayland, and Melrose to Haverhill, and down to parts of Connecticut. By adopting one of our UDF programs, a water distribution system can maintain efficiency and cleanliness longer between flushes, save money, and ultimately use less of our earth’s natural resources.

Benefits of Unidirectional Flushing (UDF) Infographic

Unidirectional flushing (UDF) is a unique process utilized to maintain a distribution system as well as learn critical information about the system. An effective UDF program should be conducted annually, at a minimum. Check out our UDF infographic that shows the benefits of UDF over conventional flushing:

UDF-infographic

Please feel free to print and share, with attribution, our UDF Infographic. A high resolution pdf can be downloaded by clicking here.

The Criticality of Unidirectional Flushing (UDF) Programs for Water Utilities

Water utilities today are faced with a unique set of difficulties. Population growth has resulted in unprecedented demand while climate change has caused supply to dwindle. Increased regulations have forced utilities to invest more and more capital into treatment while budgets have shrunk. In addition, our nation’s aging infrastructure has forced water utilities to heavily invest in repair and replacement of the distribution system. Therefore, it has become critical that utilities utilize the most cost-effective and efficient methodologies in order to maintain and improve their water systems.

A key issue in distribution systems is tuberculation, or build-up, on distribution pipe walls. These deposits, most frequently caused by corrosion and microbial activity, affect both the quality and quantity of the water supply. Excessive tuberculation greatly reduces distribution system efficiency and has a negative impact on water quality. In fact, AWWA has noted that distribution system deficiencies are responsible for over 25 percent of waterborne disease outbreaks in the United States each year.

Fortunately, implementation of a planned, systematic Unidirectional Flushing (UDF) Program helps to reduce these issues. UDF is utilized to maintain a distribution system and provides the added benefit of learning critical information about the system. This information allows utilities to efficiently plan and make the most imperative improvements to the system. And while the primary goal of UDF is to clean water mains, there are also several peripheral benefits. A routinely implemented UDF Program helps to regularly exercise hydrants and valves, prolonging the life of the valves and helping to locate any closed or broken valves. Flushing also helps to pinpoint the cause of water quality or pressure issues in a specific area of the system while determining discrepancies between the hydraulic model and the distribution system. Flushing frequently enables system issues to be discovered before they become critical and require emergency service, giving utilities sufficient time to address and budget them.

Because demand is highest in summer and would make flushing impractical, and low temperatures in winter would cause unsafe conditions from flushed water freezing on roadways and sidewalks, flushing is typically performed in the spring and fall. Currently, Tata & Howard is assisting the communities of Haverhill and Manchester By The Sea, MA and Norwalk First Taxing District in Norwalk, CT with their annual UDF Programs. Both AWWA and MassDEP recommend that UDF be performed on an annual basis, at a minimum. If a distribution system is too large to perform UDF annually, flushing should instead be scheduled in rotation so that all parts of the distribution system are exercised on a regular basis.

A regularly scheduled UDF Program is one of the simplest and most cost-effective ways of maintaining the health and safety of a water distribution system. For comprehensive information on UDF Programs including case studies, please download our UDF whitepaper instantly here.

Make a New Year’s Resolution to Exercise – Your Hydrants!

With the beginning of each new year come all sorts of resolutions – to eat better, spend less, organize the house, and clean the garage. But the most commonly made resolution by far is to exercise to get into better shape. And while we agree with this resolution 100%, it may not be for the reasons you think. You see, we think you DO need to exercise – your fire hydrants!

Hydrant Calisthenics

Exercising hydrants comes in the form of unidirectional flushing (UDF) which, just as the name implies, flushes water in one direction from the cleanest possible source, such as a well, outward to dirty mains, finally exiting a hydrant. This unique process is utilized to maintain a distribution system as well as learn critical information about the system, allowing utilities to make future improvements based on the information acquired. The primary goal of UDF is to clean water mains, removing as much sediment, debris, and loose tuberculation as possible. Performing unidirectional flushing on an annual basis helps to avoid tuberculation and sedimentation buildup. Water mains that are not flushed on a regular, scheduled basis run the risk of building up tuberculation to the point that the buildup cannot be removed by flushing, and this can have a significantly negative impact on water quality, fire flows, and distribution system efficiency.

While the primary objective of unidirectional flushing is to clean mains, there are also many secondary goals and benefits. Exercising hydrants and valves prolongs the life of the valves while also locating closed or broken valves. In addition, flushing helps to narrow down a search area when trying to determine the cause of water quality or pressure issues in a specific area of the system. In a best case scenario, the flushing will actually alleviate the water quality issues by flushing out any debris or buildup that is causing the problem. Also, there are often discrepancies between the hydraulic model and the distribution system that can be discovered and addressed during flushing. Lastly, flushing helps to determine or disprove suspected system issues. Frequently, these issues are not of an emergency nature and can either be readily corrected during the flushing process or can be scheduled for repair at a convenient time, BEFORE they require critical attention.

According to The American Water Works Association (AWWA), “distribution system deficiencies continue to be responsible for more then 25 percent of waterborne disease outbreaks in the United States each year, a statistic that underscores the need for water suppliers to effectively control water quality within the distribution system. Flushing is one of the most powerful tools available to a water utility for maintaining this control.” For this reason, AWWA has published a set of guidelines to follow when implementing a unidirectional flushing program. They recommend a minimum velocity of 3.0 feet per second, and also recommend that system pressure in the surrounding area maintain 20 psi, similar to the concept of adequate fire flow availability.

Conclusion

There is a great deal of information that can be gathered during flushing, and the better the quality of data recorded, the easier it is to compare data, making it easier to determine if changes are occurring or if a problem has developed in the distribution system. Each step of the process is important, and a successful flushing program is a continuous process. The data should be compared on a yearly basis, at a minimum. Gaining five pounds over the course of one year seems insignificant; however, gaining five pounds per year over a course of five years will find a person with his weight up 25 pounds — and that IS significant. The same holds true for distribution systems. If the data is not reviewed annually, small problems have the potential to become large problems, and simple system improvements run the risk of being overlooked.

So while you are making your new year’s resolutions, be sure to include exercise…of your hydrants — your distribution system, customers, and operators will surely thank you. Happy New Year!

Tag: unidirectional flushing