DRAINAGE DESIGN
Sustainable Urban Drainage Systems (SuDS) design is at the core of stormwater management aiming to mimic natural performance while managing rainfall locally. We use infiltration options, attenuation systems and innovative layout arrangements to ensure maximum value is derived for the asset life.
We also produce comprehensive wastewater and foul sewer designs for efficient management of wastewater, ensuring the maximum benefit is derived from the system. In summary we produce the following :
- Drainage strategy reports;
- Drainage Design for stormwater management
- Drainage design for waste and Foul
- Sustainable Urban Drainage Systems Design (SuDS Design)
- Flood Risk Assessment reports (FRAs),
The Need For Drainage Design
A well-considered solution for the discharge of unwanted water is a criterion often poorly considered during the early stages of projects in both building and transport infrastructure. A drainage system will only be effective if sufficient effort is put into the planning stage. A well thought through, practical and sustainable drainage strategy can be the key to unlocking development potential and or overcoming planning obstacles. What is involved will vary from site to site and our highly experienced Engineers are experts in developing well-balanced drainage strategies and designs towards providing cost effective solutions to discharge planning conditions and meet project requirements.
Surveys Required For Drainage Design
It is important to get surveys commissioned earlier in the design process and different site will have different requirements. Typical surveys for a drainage project are as follows:
Topographical Survey
This is usually available as its one of the first considerations for Architects and Engineers when developing a site for any building or transport infrastructure. Topographical surveys involve the production of maps and plans to accurately represent the details of the natural and built environments. For drainage purposes the survey scope needs to include cover levels and invert levels to any drainage chambers on the site. This information and wastewater and surface water stats plans should be used
Drainage CCTV Surveys
The drainage survey picks up detailed information about the drainage infrastructure such as invert levels, drainage network (Verified with foul and storm water Stats information), gully and manhole details, SUDS details focusing on location and condition of the existing drainage system.
Statutory undertaker Information (STATS)
Details of existing statutory services in and around the site will be needed and can be procure via the C2 utility enquiry process. This helps gather all the information about the presence of underground utilities. A Ground penetrating radar (GPR) survey is also recommended subject to the scale of the development. A GPR Survey is a geophysical locating method that uses radio waves to capture images below the surface of the ground in a minimally invasive way that enables identification of underground utilities within reasonable level of accuracy (PAS 128 GPR Survey).
Soil Investigation
A soil investigation is usually carried out for structural and geotechnical engineering purposes, but it gives the opportunity to include tests for percolation rates. This test is used to determine the infiltration rate for SUDS options such as Soakaways or rain gardens. The BRE 365 test is the industry standard for infiltration tests, the video shows how to undertake the BRE365 test to determine the infiltration rate for a sustainable drainage system design.
Geo environmental surveys are also undertaken to confirm the presence of contaminants on site. Some sites may contain contamination, and this may affect the drainage design options and layout. For instance, soakaways cannot be installed in contaminated land.
Working Closely With You
We have vast experience dealing with Drainage Design covering many different types of proposed developments and highway infrastructures for our clients. We provide innovative, technically sound and robust solutions that are also cost-effective and would welcome the opportunity to provide the support you require on your project.
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