Case Study: Cherry Tree House, Telford

Percolation Tests & Drainage Strategy Suitable for planning:

Onn Point were appointed to assist a private client with their self-build project located in Telford, Shropshire.

Having reviewed the outstanding drainage conditions provided by Telford and Wrekin Council Local Lead Flood Authority, the site required percolation tests in line with BRE365 along with associated drainage strategy designed in accordance with the SuDS manual.

A trial pit dug for a BRE 365 percolation test, with the spoil heap, water bowser and excavator on site

Full scale percolation tests were carried out site confirming ground conditions were suitable for the use of infiltration and a sustainable drainage strategy, utilising the use of permeable surfacing and crate type soakaways was produced along with supporting soakaway design calculations, construction details and maintenance strategies.

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OUR WORK

Client Reviews

We are incredibly proud of our customer feedback please read some of our testimonials below.

      EXCELLENT  
   Based on 24 reviews 
    
 
 
 
   
 
 
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   Andy Kerik 
 
 
 
 Trustindex verifies that the original source of the review is Google. Rob from On Point is exceptionally professional and an all-round great person to work with. We had a very complex project, and he supported us at every stage, helping us navigate all the challenges right through to securing planning permission.
I highly recommend this company to anyone needing drainage design or similar services.

Thank you so much, Rob — you’re a star!
  
 
      Posted on Google  
   
   Ryan Taylor 
 
 
 
 Trustindex verifies that the original source of the review is Google. Outstanding service from Onn Point, great dialogue throughout the process and extremely fast turnaround to help get my project going quickly.
  
 
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   Nick Puleston 
 
 
 
 Trustindex verifies that the original source of the review is Google. We instructed Rob and his team to design a drainage strategy for our New Build in Plymouth. The LLFA raised several points that needed addressing which Rob made a priority to complete. Even though our Architect wanted to proceed to full planning with a pre condition, Rob eventually managed to address all points raised and we now have full planning permission approved by the LLFA. Our build is very complex and Rob overcome every hurdle. We can’t thank Rob and his team enough for their dedication and expertise.
  
 
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   ashley Cook 
 
 
 
 Trustindex verifies that the original source of the review is Google. Fantastic company
Rob & his colleagues helped me with a condition I had on my planning. He kept me informed all the way through the process & was very thorough. The condition was lifted with all his help. I would not hesitate to recommend Rob & his colleagues.
  
 
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   Malcolm Aitken 
 
 
 
 Trustindex verifies that the original source of the review is Google. We needed a surface water drainage plan to satisfy a pre commencement planning condition. Onn Point Civil Engineering produced a very good report which was approved by the local council and at a sensible price too
  
 
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   Christopher Hughes 
 
 
 
 Trustindex verifies that the original source of the review is Google. Highly recommended drainage specialists, flawless, great communication and very thorough. I will be using Onn Point again for further work early 2025.
  
 
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   Tim Lamont 
 
 
 
 Trustindex verifies that the original source of the review is Google. I fully recommend Onn-Point Civil Engineering ltd, we used them for retrospective drain planning, SUDS Reports, Percolation Tests & Drainage Design, on our single dwelling construction, in Mid Sussex. Rob and Andrew were extremely supportive and guided us through the process and produced a very comprehensive report, for town planning which was successful for our application. this helped us a great deal/ They are without doubt very experienced in their field. I would use them again.
Tim Lamont
  
 
      Posted on Google  
   
   Preston Jones 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great service.
Took the time to explain technical issues with a non professional.
Andy and Rob were great.
I would definetly recommend.
  
 
      Posted on Google  
   
   David Williams 
 
 
 
 Trustindex verifies that the original source of the review is Google. Excellent service, very professional and delivered on time. Very pleased overall, thank you
  
 
      Posted on Google  
   
   Liam Devaney 
 
 
 
 Trustindex verifies that the original source of the review is Google. Rob and the team at Onn-Point have been brilliant throughout the process. Friendly, polite and professional. Great communicators and a pleasure to work with
  
 
  
  
 
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Tell us about your site

Send us the site address and the condition wording, or the planning reference, and we will tell you exactly what is needed. If you do not need us, we will say so.

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01902 585 206

The engineering behind it

A single dwelling on a site where the ground would take water, so the scheme could stay at the top of the drainage hierarchy and soak away rather than discharge to a sewer.

What the ground allowed

Infiltration testing by PT (West Midlands) Ltd confirmed the ground was suitable, so surface water is disposed of on site through two crate soakaways rather than being piped away. Both are wrapped in geotextile to stop silt migrating in and clogging the void over time: the usual reason a soakaway that worked on day one stops working a few years later.

Foul drainage

Foul water connects to an existing manhole on the public foul sewer, subject to Section 106 approval from the water authority. Access and parking are laid in permeable construction so hardstanding does not add to the surface water load.

The numbers

Main soakaway	Crate type, 10.5m × 1.0m × 1.0m deep
Second soakaway	Crate type, 4.0m × 1.0m × 1.0m deep
Cover to base	1.0m from incoming invert
Silt protection	Geotextile wrap to both
Hardstanding	Permeable construction
Foul	New connection to existing public foul sewer, subject to S106
Infiltration testing	PT (West Midlands) Ltd

Taken from the drawing set for this job. The scheme was approved at planning. Site named by town only; the client’s name and the full address are not published.