CCTV Drainage Survey & Condition Assessment
Ealing
London
Project Overview
Clearline Drainage was commissioned to carry out a detailed CCTV drainage survey of the communal underground drainage serving a residential block of nine flats in Ealing, London.
The objective was to clean and inspect the accessible drainage, establish its overall condition and provide the managing agent with a clear record of any defects and recommended remedial works.
The investigation covered both the foul drainage system and the surface water network, including the main drainage runs and a number of connections serving WCs, soil vent pipes and rainwater gullies.
Our Approach
We carried out high-pressure cleaning and descaling of the accessible drainage before inspecting the foul and surface water networks by CCTV in accordance with MSCC5 using SRM5 scoring.
Chambers were located and labelled, individual drainage runs were surveyed and the system was mapped to provide a clear record of the drainage arrangement across the site.
What We Found
Widespread displaced joints and fine root intrusion across both foul and surface water drainage
Cracking identified within sections of the foul and surface water systems
The foul run between MH4 and MH5 was heavily defective, with multiple displaced joints, standing water and root intrusion
Two sections of the surface water system could not be fully surveyed due to silt and an unidentified blockage
Two interceptor chambers were identified within the system
Several sections were considered suitable for structural lining following cleaning and preparation
Outcome
The survey gave the managing agent a detailed picture of the condition of the communal drainage and identified where remedial works should be prioritised.
We recommended further jetting and desilting of the blocked surface water sections, mechanical descaling and interceptor removal, followed by root cutting and structural CIPP lining to the affected drainage.
Given the extent and continuity of the displaced joints, structural lining was recommended as a more appropriate long-term solution than carrying out multiple isolated patch repairs.
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