Civil Engineering, Flood Risk
Assessments & Drainage Design
We provide an array of Civil Engineering services from Cut and Fill Volumetrics right through to S38 Highway Design and S104 Sewer Design. Our highly experienced team works hard to ensure every aspect of your project is delivered in a timely and highly professional manner.
Drainage Feasibility Study
To asses drainage options for greenfield and brownfield sites in line with current guidance and best management practice
- Assessment of existing run off
- Percolation testing to BRE 365
- Drainage feasibility layouts
S38 Highway Design
- Preparation of construction details.
- Preparation of coloured plans for inclusion in agreements
- Highway designs using PDS software within AutoCAD and in accordance with Local Authority design guidance and specifications
Drainage Design
- S102 design works for existing unadopted sewers not covered by a S104 agreement
- S104 sewer designs for submission to and approval by Water Authorities
- S185 sewer diversion designs for submission to and approval by Water Authorities
- All aspects of SuDS designs including tanks, oversized pipes, cellular storage, soakaways, ponds, wetlands etc…
- Simulations for storm return periods as required by regulatory bodies including allowance for climate change
- Drainage designs using PDS software within AutoCAD and simulated within MicroDrainage and in accordance with relevant design guides including Sewers for Adoption, SuDS manual, Rainfall Run off Management for Developments – Report SC030219 etc.
External Works
- Preparation of detailed external works drawings showing proposed floor levels, flag levels , drive gradients, car park levels and falls, retaining structures, underbuild to property, garden gradients etc.
- This can be done in conjunction with a detailed 3D model to compute cut and fill volumes if required.
Private / Domestic Drainage
- Design and detailing of private drainage including pipe diameters, gradients and invert levels to accord with part H of the Approved Document
Cut and Fill Volumetrics
- Preparation of detailed 3D models based on site topographical surveys.
- Preparation of detailed 3D models of proposed site levels using for example, existing site boundaries, 3D road and footpath string lines, 3d proposed floor and externals works designs.
- Computation from the above of cut and fill volumetrics including capping layers where contamination is present
- Preparation of detailed drawings showing areas of cut / fill, existing / proposed levels, proposed contours and isopachyte contours.
Flood Risk Assessments
FRA & SUDS Reports for planning
Our FRAs cover any size or type of scheme in all sectors (residential, commercial, industrial, energy, education, public, private) and can be undertaken at every stage of the project i.e., project feasibility, site selection, pre or post planning.
We take pride in ensuring you understand what you are getting and why.
We produce FRA reports for planning; This can include SUDS and Drainage report and calculations for planning
We provide advice on tweaks required to your scheme design to ensure compliance / save costs
We produce sustainability FRAs to secure credits (eg: BREAM).
Detailed Drainage Design
All adoptable (S104 of the Water Industry Act) and private drainage design suitable for construction
Sewer diversions/build-over agreements (S185 of the Water Industry Act)
Flood Risk Assessments and Sustainable Drainage Systems - FAQs
Who are our reports compliant for?
Your project aspirations: including minimising design and project costs
We provide fully compliant FRAs to secure approval from the local council, the Environment Agency, Natural Resources Wales, the Scottish Environmental Protection Agency and the Lead Local Flood Authorities
Concept through to detailed drainage designs and calculations including SuDs (Sustainable Drainage) design.
Drainage and SuDs Maintenance and Management reports
What mandatory legislation/guidance will we ensure you are compliant with?
PPG 2015 / NPPF: Sequential Tests and Exception Tests
SUDS Guidance (March 2015)
New Climate Change Allowances (Feb 2016)
Welsh TAN 15 and guidance
Scottish SPP and guidance
