Carbon Emission Reduction

How we are able to offer a 74% reduction in greenhouse gas emissions utilising our in-situ filter drain refurbishment v’s conventional methods.

Our Commitment

At Crown Plus we continually work on our vision to offer smart working solutions and sustainably better highways, working continually to improve efficiencies and reduce the carbon footprint for both our organisation and that of our clients.

“We have a vision to reduce our carbon footprint, however we can’t manage what we can’t measure” says Commercial Director Paul Conner.

The delivery of this vision promoted the instruction of an independent 3rd party Carbon Assessment completed in accordance with the international standard BS EN ISO 14064-1, undertaken for the business activities of Crown Plus, as well as a professional carbon emission comparison between the conventional method of Filter Drain Refurbishment (FDR) and the Crown Plus in-situ FDR method.

Initial Desk-top Carbon Assessment for In-Situ Filter Drain Refurbishment

An initial assessment was commissioned providing a detailed analysis over 5 schemes, of the carbon emissions incurred through Crown Plus’s in-situ FDR method compared to the conventional approach. From the 5 schemes analysed a reduction of 332tCO₂e was shown using the in-site method. The Assessment concluded that the following carbon emission savings were possible using the In-situ FDR approach:

Reduction in Carbon Emission from new material
1 %
Reduction in Carbon Emissions from Aggregate disposal
1 %
Reduction in Carbon Emissions from Diesel
1 %

Scheme specific Carbon Assessment for In-Situ Filter Drain Refurbishment

We wanted to test the desk study further so further commissioned a deep dive assessment on a specific scheme.
An eight-week FDR project being undertaken on the A12 for client Eurovia was selected. Crown Plus provided an independent engineering and carbon consulting company with a comprehensive dataset detailing quantity of materials, mileages and durations of vehicle and machinery operation. Calculations were supplied for the exact same scheme using the conventional “dig out and replace” method to allow for a thorough and systematic evaluation.

The report substantiated the environmental credentials of the in-situ method offered by Crown Plus. The analysis concluded that total carbon emissions from the A12 FDR scheme were 161 tCO₂e (tonnes of carbon dioxide equivalent emissions). In comparison, if the scheme had been carried out using the conventional “dig out and replace” method, the greenhouse gasses would have been 626 tCO₂e. This means by operating the Crown Plus FDR method, a significant saving of 465 tCO₂e was achieved. A 74.3% reduction.

So, what does a 74.3% reduction look like?

The total saved emissions of 465 tCO₂e are equivalent to:

1,154,226 Miles

Emissions from driving 1,154,226 miles using an average fuel car; equal to driving the circumference of world over 46 times

223 Tonnes

Emissions from burning 223 tonnes of charcoal

7,689 Trees

Sequestration from 7,689 trees grown for 10 years

The results of these independent assessments fuel our commitment to further reduce the environmental impact for our organisation and that of our clients. It not only provides substantiated and independently verified comparisons on the possible reductions using the FDR method but focuses our attention to further identify solutions for a more environmentally sustainable way of working and improving highways. 

If you would to discuss our In-situ FDR solutions or if you would like a copy of our 3rd Party Carbon Emission Reports please contact Gary Price @

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