Why Do I Need A Silt Trap?

Published: 6th November 2020

Why Do I Need A Silt Trap?

Silt traps are an essential element of any efficient surface water run-off system. When silt from draining surface water gets into a drainage system it can affect its ability to function properly. Clogged pipes or silted soakaways can cause a build-up of this surface water. In the worst cases significant surface flooding can occur, and often the drainage system will need replacing. This is not only costly but unnecessary, and can be avoided using efficient silt traps.

JKH Ltd are specialists in providing high quality drainage equipment, from standard products to fully bespoke solutions. Read on to learn more about how silt traps work, along with some of the products available from JKH Ltd.

silt traps for drainage

Trapping silt effectively

Silt is the enemy of any efficient drainage operation, so preventing it from entering the system is key. Silt traps come in many forms depending on the circumstances, but all work to the same principal. The trap is the first point of contact for water as it enters the drainage system. As water fills the trap, the silt will naturally sink to the bottom, below the invert of the pipe. When the water reaches the level of the outlet pipe, it is free to flow into the drainage system leaving the silt behind.

One of the most important things to consider when installing a silt trap is the need for maintenance. When a trap itself becomes clogged up with silt, it ceases to be effective. An access point will need to be included so that silt can be removed when it begins to build up. For smaller silt traps this often involves the removal of the silt bucket. However, in the case of larger traps the silt may be sucked out using specialist or agricultural equipment.

Products available from JKH Ltd

GRC Silt Trap Inlet

This is a lightweight trap made from glass fibre reinforced concrete, suitable for pipes up to 360mm OD. It is suitable for most situations involving a piped ditch inlet, and is particularly suitable for use with plastic drain pipes. JKH offer a two-piece square back GRC silt trap for easy handling in difficult conditions and a curved back GRC silt trap which will accept pipes at a range of angles. These products are ideal for agricultural use. GRC silt traps are supplied with a hinged galvanized metal trash screen.

Type X Silt Trap Inlet:

Made from steel reinforced concrete, this is a one-piece unit suitable for pipes up to a maximum of 750mm OD. Offering generous silt capacity, this unit is supplied with a hinged galvanized metal trash screen. This heavy duty trap should be installed on a level base, such as dry mixed concrete. Therefore, the units will need to be lifted in separately.

Two Piece Heavy Duty Silt Trap

Constructed from steel reinforced concrete, this trap is ideal for use on larger diameter pipes. It is particular suited for use in situations where water flow is at higher velocities. The unit is provided with a heavy duty galvanised weed screen.

If you’re looking for a high quality and effective pre-cast concrete drainage solution, here at JKH Ltd we have the knowledge and experience to provide it. Take a look at our products, and feel free to give us a call for more information.

Choosing the Right Inspection Chambers for Your Drainage Project

Published: 25th October 2020

Inspection Chambers for Your Drainage Project

Drainage is a very important concern within any property. Not only will implementing the right solution help to prevent damage, but it will also ensure that problems can be solved without spending a great deal of money. This is why inspection chambers may be required in order to address any existing issues.

What is an inspection chamber and what is its main purpose? Are there different types? How can you choose the right model with the help of the experts at JKH Drainage? Let’s look at each of these questions.

inspection chambers for drainage projects

What are Inspection Chambers?

Drainage inspection chambers are simply access points within an existing underground network of pipes. They are often found where a series of pipes or outlets meet. The main purpose of these chambers is to provide professionals with visual access to the system. So, it is much easier to tell if a repair is required during a standard survey.

As you might have imagined, the type of underground chamber will vary depending upon the existing drainage system. This is why choosing the best design will normally require the advice of an expert. Here are some common options:

  • One-piece circular chambers
  • Octagonal junction boxes
  • Sectional inspection chambers
  • Chambers containing meters and other monitoring equipment

Selecting the right model will depend on issues such as depth, the number of pipes and the total length of the drainage system.

When are Inspection Chambers Required and How are They Installed?

So, when might an inspection chamber be needed? There are several scenarios which will require its presence. A chamber should be present if the direction of any pipework changes by an angle of more than 30 degrees.

Changes in the size (diameter) of a pipe will also warrant an inspection chamber. If two pipes join together at a 45-degree angle or more, a chamber is required. Most experts recommend that a chamber should be installed if a run of piping exceeds 22 metres in length.

An inspection chamber will be installed by digging around the pipework or junction. Some pipes may need to be cut in order to fit into the chamber. Assuming that all pipes have been connected, the hole will subsequently be back-filled.

You can find more information by visiting the official drain and waste disposal page provided by the government.

Do you suspect that an inspection chamber might need to be installed? Are you confused as to which design is the best suited for your property? These are only two of the many issues that we are more than happy to address. Please take a look at our line of products and contact our team at JKH Drainage to ask any additional questions that you might have. We will be more than happy to help.

Suffolk Chamber of Commerce membership

Published: 15th July 2020

We are now members of the Suffolk Chamber of Commerce.

Membership certificate – JKH Ltd

Corvid-19 Safety

Published: 10th July 2020

We are committed to protecting our staff and customers, and are closely following the government’s safety guidance.


British Pre-cast Society

Published: 3rd July 2020

This year we became full members of the British Precast society. We are very proud of all the hard work our team has put into achieving membership. Membership demonstrates our commitment to zero harm and improving environmental performance in the industry. Find out more about the Sustainability Charter Scheme here.

British Precast society Membership Certificate

The Parliamentary Review

Published: 29th January 2020

“JKH’s efforts to reduce environmental impact could help UK hit net-zero carbon targets”

We have been featured in the parliamentary review, read the full article here: The Parliamentary Review



London Direct Vision Standard (DVS) HGV Safety Permit – We have permits!

Published: 17th December 2019

As part of JKH’s efforts to remain leaders in concrete production and metal fabrication we also see our transport as an important part of the business. Using the equipment fitted at FORS Silver level we have been able to obtain permits for our lorries to enter London until 25 October 2024.

The Direct Vision Standard (DVS) and safety permit for heavy goods vehicles (HGVs) requires all lorries over 12 tonnes gross vehicle weight to be granted a permit to enter or operate in Greater London. The scheme was created to improve the safety of all road users, including pedestrians, cyclists and motorcyclists.

FORS Silver Accreditation

Published: 10th July 2019

As part of JKH’s ethos into continued improvement and development whilst reducing the impact upon the environment, we have now achieved the Silver level of FORS accreditation. Not only does the FORS standard help monitor best practises within the industry but also helps the continued improvement of health & safety and reduces the impact on the environment.


Published: 21st June 2019

In June we attended the NAMM (National Association of Memorial Masons) TRADEX 2019 show. We had a great time meeting new and existing customers, and our new range of memorial bases were well received.

New mixer plant

Published: 19th June 2019

We recently completed the replacement of your entire concrete mixing plant, investing back into the company as we strive to constantly improve our quality and reliability.

What Next

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