Pre-Construction CCTV Drain Survey
Glebe House
Wareham, Dorset
Project Overview
Clearline Drainage was instructed to undertake a comprehensive CCTV drainage survey at Glebe House, Wareham, as part of proposed building alterations involving the installation of additional toilet facilities.
A previous drainage survey had been completed; however, the information provided was insufficient for design purposes and did not provide the level of detail required to confidently assess the existing drainage infrastructure.
The objective was to establish the layout, condition and connectivity of the foul drainage system, enabling the design team to determine suitable connection points for the proposed new WCs.
Our Approach
Our engineers carried out a full CCTV investigation of the site's foul drainage network, locating and tracing accessible manholes, mapping drainage runs and surveying the system to the maximum extent possible.
The survey included:
CCTV inspection of existing foul drainage pipework
Tracing and verification of drainage connectivity
Identification of buried and inaccessible chambers
Condition assessment in accordance with MSCC5 standards
Production of drainage drawings and a detailed condition report
What We Found
The investigation revealed that the drainage system was in significantly poorer condition than anticipated.
Key findings included:
Extensive root ingress throughout multiple drainage runs
Circumferential and radiating cracking within clay pipework
Displaced joints and localised structural failures
Buried manholes preventing full access to parts of the system
Areas of rubble intrusion restricting pipework
A defective chamber requiring replacement
The volume and continuity of defects indicated that isolated repairs would not provide a long-term solution.
Outcome
The survey successfully provided the client and design team with a clear understanding of the existing drainage infrastructure and highlighted the remedial works required before additional loading from new toilet facilities could be introduced.
The findings enabled informed design decisions to be made, identified suitable connection points for future development and provided a clear remedial strategy to restore the drainage system to a functional condition before construction progresses.
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