Septic Tank Installation & Civils and Drainage Project Overview
Many rural properties in Dorset continue to rely on older wastewater systems that can become inefficient, costly to maintain, and challenging to access. This case study highlights a comprehensive civils and drainage project undertaken to replace a shared cesspit with a modern septic tank solution. The scope of work involved rerouting the property’s foul drainage network, installing a new pumping system, completing a full septic tank installation, and constructing a purpose-designed drainage field. Located in rural Dorset, this project demonstrates Metro Rod Dorset & Portsmouth‘s expertise in delivering septic tank solutions across Dorset and the surrounding areas, including Portsmouth. In this case study, Metro Rod Dorset & Portsmouth delivered a reliable, future-proof wastewater management system tailored to the needs of a large residential property.
The Challenge: Replacing an Outdated Cesspit with a Modern Septic Tank System
The Dorset property was connected to a shared cesspit located within a farm courtyard, creating ongoing operational and maintenance challenges. The existing arrangement was not ideally situated for long-term servicing and limited the property’s control over its wastewater infrastructure. A new solution was required that would remove dependence on the shared cesspit, improve accessibility for future maintenance, and provide a compliant system capable of handling the wastewater output of a 10-person household. The project also needed careful planning and utility checks to ensure excavation and installation works could proceed safely without impacting underground services or surrounding areas. As with many rural properties across Dorset, the system required upgrading to provide a more efficient and long-term solution.
The Solution: Septic Tank Installation, Drainage Field Construction & Civils and Drainage Works
A full civils and drainage programme was designed to reroute the foul drainage system from the existing cesspit to a new standalone septic tank and drainage field located within the property’s boundary. All external foul pipework was disconnected from the original cesspit and redirected to a newly installed pump chamber positioned outside the conservatory area.
To transfer wastewater efficiently across the site, a new pipe route was created using trenchless moling techniques beneath key access areas. The pipeline was then routed around the property to a strategically positioned septic tank, installed near the paddock boundary to allow straightforward access for future emptying and maintenance operations.
The septic tank installation included a Klargester 10-person septic tank, an 800-litre sewage macerator pump station, MDPE pipework, manholes, foul gullies, concrete works, and associated fittings. Alongside the tank installation, engineers constructed a professionally designed drainage field using perforated land drainage pipework and geotextile membrane. The drainage field was calculated to accommodate the wastewater discharge expected from a 10-person household, ensuring long-term performance and effective treatment of effluent.
This septic tank installation in Dorset required careful planning, specialist equipment, and experienced civils and drainage engineers to ensure the new system was installed efficiently and in line with industry best practice. Similar septic tank installation projects are regularly completed throughout Dorset, Portsmouth, and the surrounding areas.
The works were completed over multiple site visits, with engineers undertaking excavation, pipe installation, pump chamber construction, tank placement, drainage field installation, backfilling, and final system integration. Throughout the project, utility surveys and service checks were conducted to minimise risk and ensure the safe delivery of all groundwork operations.
The Outcome: Future-Proof Wastewater Management with a New Septic Tank and Drainage Field
The completed project successfully replaced the shared cesspit with a dedicated septic tank and drainage field system, giving the property a reliable and efficient wastewater solution. By combining specialist civils and drainage expertise with a carefully planned septic tank installation, the team delivered a system designed for ease of maintenance, improved accessibility, and long-term performance. The new infrastructure now provides sufficient capacity for a 10-person household while reducing reliance on shared facilities and creating a modern wastewater management system tailored to the property’s future needs.
Need a Cesspit Replacement or Septic Tank Installation in Dorset? Contact Our Civils and Drainage Team
If you’re looking to replace an ageing cesspit, upgrade an existing wastewater system, or require expert support with septic tank installation in Dorset, Portsmouth or surrounding areas, our experienced civils and drainage team can help. From initial site assessments and drainage design through to the installation of a new septic tank and drainage field, we deliver tailored solutions for residential and commercial properties.
Get in touch today to discuss your project and discover how we can provide a reliable, compliant, and future-proof drainage system.
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