A combined Topographical and Underground Utility of the whole site was carried out over the 2-week Christmas holiday in December 2021, with a 3-person survey team.
The site area measures approximately 1.77ha, and the survey was carried out to PAS128 M2 specification. The level of detail, and intensity of services on treatment works, makes the surveys particularly challenging, with accuracy paramount to ensure the hydraulics of the treatment plant work correctly.
All Topographical features and Underground Utilities were accurately surveyed, including items such as weir levels, pipe invert levels, pipe diameters and chamber dimensions. The Utility Survey was carried out using the latest technology, including RD8200 and Mala HDR Pro GPR units, and the Topographical Survey was carried out using Trimble S10 Total Stations and R10 GPS units.
The Laser Scan Survey was carried out in January 2022, using a Faro S150 Laser Scanner to capture the point cloud and photogrammetry information. Ideally each feature to be modelled needs to be captured from multiple scan locations, so the surveyor worked around the site capturing close to a 100 over-lapping scans. The scans were captured and transferred to a site-based processing computer which enabled the scans to be registered whilst on site, reducing the office processing time required. The surveyor placed a combination of magnetic spheres and checker-board targets around the site to create a control network for the survey. This ensures that the scans are directly related to each other and ensures the resulting point cloud is accurate.