A weir is one of the most useful tools you can install in your water management system. However, like most tools, getting the most out of your weir depends on understanding how to use it correctly. Inexperienced weir operators often have trouble reading the levels in the weir, potentially putting the success of your system at risk.
Before installing a weir in your system, it’s a good idea to learn the correct way to read your weir so that you can take the accurate readings that you need. Learn how to correctly read a weir so that you can ensure the success of your operation and learn how you can purchase high-quality, durable weirs.
The most difficult part of reading a weir is choosing the correct point of measurement. Generally, this is because measuring from a weir is much different than measuring from a flume. With a flume, your point of measurement is in the flume itself, which is very convenient. If you use a weir, you will need to take your measurement upstream of the weir.
Because of a standard weir’s design, the water approaching and passing over the weir crest will experience a drawdown, which is why you cannot measure directly at the weir. To avoid the effects of the drawdown, you will need to take your measurements at a distance that equals three to five times the maximum head upstream of the weir crest.
Weir Face Measurements
One of the biggest mistakes that novice weir operators make is attempting to take measurements at the face of the weir. The surface of the water in your system will drop as its velocity increases while approaching the nappe. This drop is most pronounced at the face of the weir and, if you measure at this point, you will only get an idea of the direction of the flow and not the flow rate.
When used correctly, weirs have a +/-2% accuracy. However, if you measure at the face, this accuracy will be significantly reduced. Make sure your operators know that they should refrain from measuring at the weir face if you want the most accurate readings possible.
Developing your weir pool is an important part of effectively using your weir. To do this, your weir crest needs to be positioned correctly, which is generally two times the maximum anticipated head. Your gauge zero also needs to be set at the zero reference elevation for head measurement.
Weirs differ from other measurement devices in that there will be some water below the gauge zero. Because of this, many operators attempt to measure from the surface of the water to the floor and then deduct the height of the crest to determine the head. However, this method fails to take into account sedimentation or crest shift.
Read a Weir Correctly
As long as you use the correct method for reading your weir, you can easily maintain the accuracy of your system. To make sure you can read a weir the right way, you need high-quality tools, which you can find by shopping withTracom, FRP.
Tracom provides the fiberglass weirs that you need to ensure the consistent success of your operation.Contact us today for more information.
There are several different styles of flumes that you could choose to manage the flow in your system. However, perhaps the most interesting is the Cutthroat flume. These flumes have been in existence since the 1960s and were designed to effectively measure flow in flat channels.
If you’re not familiar with the Cutthroat flume, then you might not be aware of the innovative design that makes this flume so different from other flume options. Read how the Cutthroat flume differs from other flow management tools and find out if this flume type is the right choice for your system.
There are several characteristics that make the Cutthroat flume different from other flumes, but the most noticeable is its lack of an extended throat. In fact, this is where the Cutthroat flume gets its name, because it has literally cut out the throat that you would find in other flumes.
The lack of a throat provides the Cutthroat flume with several advantages. For instance, it is capable of measuring a variety of flow rates. In addition, Cutthroat flumes are much less at risk for sedimentation than flumes with longer throats. If you want to avoid sedimentation as fully as possible, consider choosing a wider Cutthroat flume.
Another factor that makes the Cutthroat flume unique among flumes is its flat floor. Having a flat floor makes the Cutthroat flume extremely useful as a retrofit device, meaning this flume can be installed directly in channel floor without the need for extensive adjustments. For comparison, the Parshall flume requires either a downstream channel change or elevation before it can be installed in a channel.
Also, unlike other flume types, the Cutthroat flume does not need adjustments in order to achieve supercritical flow. This means you can install a Cutthroat flume in your system and start taking consistently accurate measurements almost immediately.
Perhaps the biggest advantage of a Cutthroat flume is that it can be used in an almost unlimited variety of applications. Whatever your flow measurement needs, the Cutthroat flume makes a superb choice.
For example, because of its resistance to sedimentation, the Cutthroat flume can be used in wastewater and industrial applications where solid debris is likely to be present. A few of the other common uses of a Cutthroat flume include surface water and irrigation flow management, proportional flow splitting, and mine dewatering. If you have a flat gradient in your system where you need to measure and manage flow, you should strongly consider using a Cutthroat flume.
Purchase a Cutthroat Flume
If you’re looking for a versatile flume to help you measure and manage the flow in your system, your best choice is a Cutthroat flume. With a Cutthroat flume, you’ll be getting several exciting advantages, including a flat floor, a missing throat and a variety of installation applications. Purchase the Cutthroat flume that you need for your water management operations by shopping withTracom, FRP.
Tracom is proud to offer our customers durable and versatile fiberglass water management tools. We stock flumes, weirs, and every other tool that your operation needs for success.Contact us today to learn about our best products and to request a quote.
When you need to measure flow in an outdoor setting, then you will almost always need to install your primary device in an earthen channel. While installing a flume in an earthen channel can be done relatively easily, your flume will need to be stabilized to prevent it from shifting and allowing your flow to escape.
Fortunately, there are several convenient solutions for supporting your earthen channel flume that will ensure your operation can take accurate readings well into the future. Here are a few options for supporting flumes in earthen channels and advice for equipping your system with the right water management tools.
One of the most common and most effective solutions for supporting your earthen channel flumes is known as the timber pier approach. While this support method can be time-consuming, it can easily keep your flume in place and help to maintain the integrity of your channel
With this method, trenches will be dug during excavation to accommodate wooden railroad ties that will be installed perpendicular to your flow. The wooden ties should be made from a durable softwood or hardwood and should be installed underneath the throat of your flume and at both ends. Additional wooden ties can be added depending on the size of your flume and the installation channel.
The other most common solution for providing support to your flume is using a concrete base. This solution is extremely popular because concrete is very resistant to environmental stresses and requires virtually no maintenance from your operators.
Concrete bases are a great solution for supporting your flume because they can be pre-cast, which reduces the amount of time needed to install your flume. Shortly after the concrete for your base is poured into the case, steel rods will be inserted into the concrete. These rods will be used to secure your flume to the concrete base after it has dried.
If you choose a concrete base, it can either be poured on-site and the flume attached later or constructed off-site with the flume installed and then moved to the earthen channel later. When you’re ready to install your concrete base, the flow will need to be blocked so that you can excavate your site and then install the base. As you might imagine, the labor costs for a concrete base can be much higher than with other support options.
After your flume and concrete base have been placed correctly, you will use sandbags to further stabilize the flume and then fill in gaps with excavated dirt. For extra stability, you can use sandbags filled with concrete.
Install Flumes in Earthen Channels
If you’re going to measure flow in an earthen channel, you need to make sure that your flume is supported as fully as possible. Fortunately, as you can now see, there are multiple ways you can support your flume and ensure the accuracy of your readings. Before you can support flumes in earthen channels, however, you need to purchase a fiberglass flume fromTracom, FRP.
The Tracom catalog features durable, affordable fiberglass products, including a great selection of flumes and weirs.Contact Tracom today for your needed water management tools.
Out of all the flow management tools available to water management operations, the best choice is a Parshall flume. The most popular flume type in the world, the Parshall flume offers everything that your operation needs for success, including flexibility and accuracy.
However, before you can start taking advantage of the high-quality Parshall flume, there are several decisions that need to be made, including where you will install your flume. Here are a few easy tips for choosing a Parshall flume installation site and advice for purchasing fiberglass water management tools.
Examining Channel Location
The very first, and some would say most important, step in choosing a site to install your Parshall flume is considering the channel. For instance, if you are planning to install your Parshall flume in an earthen channel, there are several calculations that will need to be made, including the width of your flume.
With an earthen channel installation, your flume will need to be between one-third and one-half of the width of the channel. This range will help you accommodate most flows and will also help control the costs of your flume installation. While it’s possible to install multiple Parshall flume sizes in order to handle a wide range of flow rates, the more cost-effective solution is to install a single large Parshall flume.
Check Your Channel Condition
After you’ve examined the location of your channel and determined the right Parshall flume width, you will need to check the condition of the channel. Your channel’s condition will directly impact the flow in your system and the effectiveness of your Parshall flume.
The flow at the point in your channel where you plan to install your flume needs to be completely free from turbulence and needs to possess a quality velocity pattern. In addition, the flow should be balanced and have no visible surging. Should the flow at your installation point possess any of these negative characteristics, you will either need to choose a new installation location or make corrections.
As part of its design, a Parshall flume will need a drop in elevation to work correctly. However, certain installation sites are unable to accommodate this drop, which means you will instead need to elevate your Parshall flume above the channel floor.
If you need to elevate your flume, you will need to make sure that your installation channel can handle the increased depth. If the channel walls are too low, you may need to choose a larger flume size. Also, when you elevate your flume, you increase the chances of submergence. Be very cautious when elevating your flume to ensure the success of your system.
Choose a Parshall Flume Installation Site
Clearly, choosing a location to install your Parshall flume is a very delicate process, requiring a close attention to detail and the right tools. Purchase the tools you need to choose a Parshall flume installation site by shopping withTracom, FRP.
With Tracom, you can find a great selection of fiberglass water management products, including everything you need to quickly and easily install your Parshall flume.Request a quote from Tracom today.
In your water management operation, you will use one of two primary flow measuring devices: a flume or a weir. What you might not realize, however, is that flumes and weirs come in multiple styles, and not every style matches every application. This means that before you can install a measuring device in your system, you need to decide which style matches your needs. Fortunately, this isn’t difficult when you have the right information at your disposal.
Learn about different styles of flumes and weirs, and find out how you can purchase the right flow management tools for your system.
Configuration of Site
The first factor that you need to consider when choosing your flume or weir style is the configuration of the installation site. Different flumes and weirs have different installation needs, and examining your site should help you choose the right flow management tool for your operation.
For example, if you want your weir to function properly, the water spilling over the nappe must be correctly aerated. If your installation site cannot ensure proper aeration, then a weir may not be the right choice for you. Similarly, most styles of weir will need to be installed in a flat channel.
Composition of Flow
After examining your installation site, you will need to think about the composition of your expected flow. For instance, while weirs can handle most flow volumes, they can be very vulnerable to flows with solid wastes. This is because sediment can easily be caught in the V-notch of most weirs. If solids will be present, then you may need a Rectangular or Cipoletti weir.
Virtually every flume style can pass solid waste to some degree or another. However, certain flumes are better at passing solids than others, including the Parshall flume and H-flume. If you know the amount of sediment your flow will contain, you’ll be better able to choose your weir or flume style.
The final issue that you need to take into account is the flow range that your system will experience. Some flumes and weirs need a consistent flow rate to function properly. Determining your typical flow rate prior to installation will ensure you choose the right flume or weir.
When it comes to flumes, Trapezoidal and H-flumes are the best choice for low flows. For larger flows, you will need an HL or Parshall flume. If you want to use a weir and expect a low flow, you will need a V-notch weir. Cipoletti weirs are more suited to heavier flows.
Purchase Styles of Flumes and Weirs
Clearly, choosing the right style of flume or weir for your system can be very complicated, and depends on several different issues. Once you’ve decided on the right styles of flumes and weirs for your operation, you should purchase your tools from a dependable source likeTracom, FRP.
When you browse the Tracom catalogue, you’ll find high-quality fiberglass water management products, including the most popular styles of flumes and weirs. Whatever water management tools you need, you’ll find them by shopping with Tracom.Contact Tracom today to learn more about our products.
The most important decision that you can make in your water management operation is which type of flume you will use. While there are several excellent flume choices on the market today, your best option may be an H-flume. The unique shape of an H-flume makes it a great choice for measuring a variety of flow types, and they can also be installed in several different applications.
However, despite their versatility, there are some problems associated with H-flumes, particularly in regard to their maintenance. Before you install this type of flume in your system, you need to learn about the best way to maintain this flow management tool. Here is some information about effective H-flume maintenance, and advice for purchasing this tool for your water management operation from a trusted source.
There are several advantages that the H-flume has over other types of flumes that you could choose. However, the most distinct feature of this flume is its floor. The floor of an H-flume is almost complete, allowing it to effectively pass settlement, even when the flow in your system is unusually low. This makes it a better choice than Palmer-Bowlus flumes and RBC flumes because they are at risk for sedimentation.
Because H-flumes are so effective at passing solids, they are especially useful for measuring stormwater flows, industrial flows, and any other types of flows that possess solids. However, this doesn’t mean that sedimentation can’t occur in an H-flume. When the flow in your system gets extremely low, some solids may escape the flow and lodge in the throat of the flume. Over time, this can cause your flume to be blocked.
If you’re expecting a large amount of sediments, such as after a heavy storm, you should have your operator check the throat of your H-flume to make sure that it has not been blocked. Periodically cleaning the flume will ensure the accuracy of your readings.
Besides the flume floor, the other unique characteristic of the H-flume is its V-shape discharge. While this V-shape allows the H-flume to more effectively manage and measure flow, it also makes it particularly vulnerable to blockage from large solids. This is because the V-notch narrows the closer it gets to the flume floor.
It is extremely common for the discharge in your H-flume to become blocked, particularly when there is a high volume of solids in your flow. Making sure that your discharge stays clear is crucial if you want to maintain the success of your water management operation.
Tools for H-Flume Maintenance
The H-flume is one of the most accurate, effective water management tools that you could use. However, like any tool, your H-flume will need regular maintenance to perform the way that you need. The easiest way to perform H-flume maintenance is to make sure you have the right tools, and your best resource for high-quality water management tools isTracom, FRP.
At Tracom, our specialty is producing high-quality water management tools, including H-flumes, and we can equip your operation with everything you need for long-term success.Request a quote from Tracom today so that you can purchase the right tools for your operation.