Anglian Water has re-routed a pipeline route following the recen discovery of a rare species of moth during pre-commencement work ahead of a new £6 million sewer pipe improvement scheme in Norfolk.

The rare species of moth, Commophila aeneana, known as the Orange Conch, was found by the company’s staff as they undertook ecological surveys ahead of proposed work to lay a new section of sewer pipe in Kings Lynn.

The scarce species in Britain, occurring locally in southern England, was thought to have been extinct in Norfolk until it was uncovered where the new pipe was expected to go.

Despite a multi-million pound investment, Anglian demonstrated their commitment to the environment, changing the proposed route of the new pipeline in order to avoid the sensitive area, preventing harm and disruption to its habitat.

The larvae of the Orange Conch live in the roots of ragwort, Jacobaea vulgaris, and faced potential disturbance by site activity. Ecologists at the company said the potential loss of Orange Conch population could result in “a major impact on the species at a county level”.

In addition, the method of construction was changed entirely to a directional drilling technique, a no-dig method which helped to further minimise the impact on the species.

Anglian ecologists also proposed precautionary mitigation on site in order to ensure the longevity of the species, including construction exclusion zones and the presence of an onsite Ecological Clerk of Works to oversee operations.

The removal of ragwort, where appropriate, is set to be watered, maintained and replaced upon completion, with post-completion checks in the year following construction in place to establish the continued presence of the species.

David Hartley, Anglian Water spokesperson, said:

“We take our role in the environment very seriously, and although we are investing millions of pounds into area, it’s imperative that we do so with the environment in mind.

“We’re really pleased that this vital work will help to improve the existing sewer network, ensuring a more resilient wastewater network in the area.”

The £6 million investment by Anglian Water, England’s largest water company by geographical area, will see 2.2km of new pipeline installed alongside the A148/A47, helping to improve the resilience of the sewer network in the area.

The new pipe will replace an existing sewer pipe that has reached the end of its optimal operational life, helping to reduce the likelihood of flooding and pollution in the area. The scheme, which began on 20 October, is expected to be completed by April 2020.