Drainage and Highway Design

The drainage environment is current undergoing continuous change to combat flooding which is achieved in part by managing drainage at source. We have the necessary experience to carry out the drainage design to meet these stringent requirements whilst simultaneously providing a cost-effective drainage design.

We specialise in clearing planning conditions and objections to secure planning approval with regards to drainage, flooding and highway matters. We can carry out any necessary testing such as winter soakage testing to BRE 365 and go on to immediately undertake the design work to include preparation of drawings and hydraulic drainage calculations which can be presented as a factual report that will satisfy the specific requirements of the local planning authority or Local Lead Flood Authority (LLFA)

We also specialise in preparing drainage strategy layouts and SuDS reports to support new planning applications along with nitrate neutrality reports Natural England’s 2020 guidance says that “Nutrient neutrality is a means of ensuring that development does not add to existing nutrient burdens” and this links to the requirements of the Conservation of Habitats and Species Regulations following an assessment of Nitrogen levels, and other factors, our reporting will show that your development is Nitrate Neutral, and if it isn’t we will work with you to consider a range of options to achieve neutrality, this can often include cross discipline consultation with our ecology team.

Our key services include:

• FLOOD RISK ASSESSMENTS

We can carry out Flood Risk Assessments for any scale development in accordance with the National Planning Policy Framework (NPPF), Local Authority requirements and Ciria C697. Where required, flood mitigation measures can be incorporated into the detailed drainage design.

• HIGHWAY AGREEMENTS

We can bring highway designs up to adoptable standards so that they can be adopted by the respective Highway Authority under Section 38/278 Agreements or under license.

• SOIL INFILTRATION (SOAKAGE) TESTING

We can undertake soil infiltration or percolation testing to the standard BRE 365 method or BS 6297 for discharge of treated effluent. This can either be by hand or machine excavated and can form part of a wider ground investigation as/ if required.