Phase II: Drainage Defects Confirmed, But No Estate-Wide Strategy

 Further clarification has now been provided by Atkins and the City regarding the proposed Podium Phase II works.

Atkins have confirmed that CCTV drainage surveys were undertaken for podium downpipes within the Phase II area. According to Atkins, these surveys identified blockages and pipe defects requiring unblocking, repair and replacement as part of the proposed works.

Importantly, Atkins have also acknowledged that equivalent drainage remediation work was not undertaken as part of the earlier Phase I project.

This is significant because it now appears that substantial drainage defects have been identified within the podium drainage infrastructure itself, rather than the problem being solely one of failed waterproofing membranes or surface deterioration.

At the same time, Atkins continue to make clear that they were not asked to consider the podium drainage system from an estate-wide system level perspective. The City’s earlier FOI response also confirmed that:

• no estate-wide hydraulic modelling of the podium drainage system has been undertaken,
• no comprehensive estate-wide drainage strategy exists, and
• no drainage maintenance records are held for recent years.

In light of this, an obvious question arises: would funds be better directed toward comprehensive drainage investigation and remediation across the estate as a whole, incorporating the lessons from Phase I, before proceeding with another major programme of demolition, strip-back and resurfacing works?

Another important point is the scope of the surveys themselves. While CCTV investigation of downpipes may identify local blockages and defects, it remains unclear whether this amounts to a comprehensive assessment of the wider podium drainage system and its long-term performance.

The project therefore still appears to be a localised intervention rather than part of a coordinated estate-wide drainage strategy.

Given the scale, cost and disruption associated with the proposed works, these seem entirely reasonable questions to ask before irreversible enabling works proceed.