Updated: 8 September 2026
Commercial CCTV Drain Survey Case Study: Waitrose Car Park, New Malden
AJS Environmental carried out a CCTV drain survey of newly installed channel drainage outlets at a Waitrose car park in New Malden.
The objective was straightforward but important: inspect the drainage internally, check for debris or obstructions and verify that water could pass through the surveyed outlets correctly.
Combining CCTV inspection with water-flow testing gave the client evidence of the condition and operation of the installed drainage rather than relying on a surface inspection alone.
Quick Answer:
What did the Waitrose CCTV drain survey find? The inspected channel drainage outlets were found to be clear of significant debris and obstructions, with water-flow testing showing free movement through the surveyed system. No significant blockages or visible structural problems were identified during the inspection.
Project Overview
CLIENT: Waitrose
LOCATION: New Malden
SITE: Commercial car park
SERVICE: CCTV drain survey and water-flow testing
OBJECTIVE: Verify the condition and operation of newly installed channel drainage outlets
The Commercial Drainage Challenge
The New Malden car park had undergone installation of channel drainage designed to collect and transfer surface water away from the paved area.
Following installation, the drainage outlets needed to be checked to establish whether they were:
- Clear of construction debris and sediment
- Free from significant obstructions
- Allowing water to pass through correctly
- Showing any visible internal defects
- Ready to form part of the site’s ongoing drainage system
For a busy commercial car park, drainage performance is important because restrictions within surface-water drainage can contribute to standing water and localised drainage problems.
Engineering Point
A newly installed drain should not automatically be assumed to be clear internally. Construction debris, sediment and other material can enter drainage during site works. CCTV inspection provides visual evidence of the internal condition before problems become apparent at surface level.
Why CCTV Was Used
A surface inspection can show whether a channel or outlet looks clear from above, but it cannot confirm what is happening further inside the connected drainage.
CCTV inspection allows drainage engineers to examine pipework internally and look for:
- Debris
- Sediment
- Restrictions
- Obstructions
- Joint problems
- Cracks or other visible defects
- Standing water
- Other conditions affecting the inspected drainage
AJS Environmental provides commercial CCTV drain surveys to inspect drainage condition without first excavating the pipework.
The CCTV Drain Survey Process
01 — ACCESS THE DRAINAGE
Suitable access points were used to inspect the drainage connected to the channel outlets.
02 — CCTV INSPECTION
Camera equipment was used to examine the internal condition of the drainage and check for debris, sediment and obstructions.
03 — REVIEW THE FOOTAGE
The inspection footage was monitored to identify restrictions or visible defects requiring further attention.
04 — WATER-FLOW TEST
Water was introduced to the system so its movement through the channels and outlets could be observed.
05 — REPORT & RECOMMEND
The survey findings provided the client with evidence of the inspected drainage condition and a basis for future maintenance planning.
Stage 1: Checking for Debris and Obstructions
The CCTV survey concentrated on the channel drainage outlets and their connected drainage.
The inspection looked for material that could restrict flow, including:
- Dirt
- Silt
- Loose construction material
- Small stones
- Leaves and organic debris
- Other foreign material
This is particularly useful following installation or construction work because material can enter drainage before the site returns to normal operation.
Stage 2: Internal CCTV Inspection
The camera inspection provided a direct view inside the surveyed drainage.
Rather than judging condition from the channel surface, the engineers could see whether there were restrictions or visible defects further along the system.
This is one of the main advantages of CCTV drainage surveying on commercial sites: it turns a hidden underground asset into something that can be inspected, recorded and assessed.
Stage 3: Water-Flow Testing
CCTV inspection established the visual condition of the drainage, but the project also included water-flow testing.
Water was introduced into the system and its movement through the channels and outlets observed.
During the test, the surveyed drainage allowed water to pass without signs of significant restriction, backflow or abnormal delay.
Why Combine CCTV With Flow Testing?
CCTV provides visual evidence of internal condition, while water testing provides additional information about how the inspected drainage is behaving in operation. Used together, they give a stronger picture than surface inspection alone.
Key Findings
The survey produced a positive result for the inspected drainage.
1. Outlets Were Clear
The inspected channel drainage outlets were found to be clear of significant debris and obstruction.
2. Water Could Pass Through the Surveyed Drainage
The water-flow test showed free movement through the inspected channels and outlets without significant restriction being observed.
3. No Significant Visible Structural Problems Were Identified
The CCTV inspection did not identify significant cracks, blockages or other visible structural issues within the surveyed sections that required immediate remedial action.
4. Ongoing Maintenance Could Be Planned From a Known Baseline
The survey established a recorded condition for the inspected drainage, giving the site a useful reference point for future inspection and maintenance.
Survey Result
The CCTV inspection and water-flow testing confirmed that the surveyed channel drainage outlets were clear and operating without significant restriction at the time of inspection. No major remedial drainage work was identified as necessary from the surveyed sections.
Why Post-Installation Drain Surveys Matter
CCTV surveys are often associated with diagnosing blocked or damaged drains, but they can also be valuable after drainage installation or construction work.
A post-installation inspection can help establish:
- Whether the pipework is internally clear
- Whether construction debris remains
- Whether joints and connections appear satisfactory
- Whether there are obvious restrictions
- A recorded condition of the inspected drainage
This can be particularly valuable on commercial sites where drainage later becomes part of a planned maintenance programme.
Commercial Car Park Drainage
Car parks place particular demands on surface-water drainage.
Drainage systems may be exposed to:
- Leaves
- Silt
- Road grit
- Dirt from vehicle tyres
- Litter
- Surface debris
- Heavy rainfall events
Channels, gullies and connected drainage therefore need to remain sufficiently clear for water to enter and move through the system.
Why Standing Water Matters on Commercial Sites
Restricted surface-water drainage can contribute to standing water in car parks and access areas.
Depending on the location and severity, this can affect:
- Pedestrian routes
- Vehicle access
- Customer areas
- Loading and servicing areas
- Site operation
- Long-term pavement condition
Drainage inspection and maintenance can help identify restrictions before they develop into more disruptive problems.
Commercial Drainage Is an Asset — Not Just an Emergency Service
CCTV surveying can be used proactively as part of commercial drainage management. Establishing condition before a failure occurs gives facilities teams better information for cleaning, maintenance and repair planning.
When Should Commercial Drainage Be Inspected?
There is no single inspection interval that is appropriate for every commercial property.
The frequency should reflect factors such as:
- Site usage
- Previous drainage history
- Debris and silt exposure
- Flooding risk
- Drainage design
- Previous repairs
- Planned construction work
- Facilities-management requirements
Inspection may also be appropriate following installation, repeated blockage, unexplained standing water or major site works.
What Happens If a Commercial CCTV Survey Finds a Problem?
The next step depends on what the camera inspection reveals.
AJS Environmental can support commercial drainage with services including:
- Drain cleaning
- High-pressure water jetting
- Jet vac services
- Robotic cutting
- Patch repairs
- UV drain lining
- No-dig pipe repair
- Groundworks where excavation is necessary
Where a structural defect is identified and the pipe is suitable, UV drain lining can provide a no-dig rehabilitation option without excavating the entire pipe run.
Why CCTV-Led Commercial Drainage Maintenance?
The advantage of CCTV-led maintenance is that decisions can be based on evidence from inside the drainage.
01 — INSPECT
Use CCTV where required to establish internal drainage condition.
02 — IDENTIFY
Locate debris, restrictions, structural defects or other drainage problems.
03 — CLEAN OR REPAIR
Match the intervention to the actual condition of the drainage.
04 — VERIFY
Where required, use follow-up CCTV inspection to confirm the post-work condition.
The Final Outcome
The Waitrose New Malden project demonstrated the value of using CCTV inspection as a verification tool rather than waiting for a drainage failure.
The survey confirmed that the inspected channel drainage outlets were clear of significant debris and that water could move through the surveyed drainage without significant restriction.
Most importantly, the client received evidence of the condition of a hidden drainage asset and a useful baseline for future maintenance.
Project Result
Survey. Verify. Maintain. The CCTV survey allowed AJS Environmental to confirm the condition of the newly installed drainage and give the commercial site a clearer basis for future maintenance decisions.
Commercial CCTV Drain Surveys
AJS Environmental provides CCTV drain surveys for commercial properties, managed sites, schools, infrastructure, public-sector environments and other drainage networks across the South East.
CCTV surveying can support:
- Condition assessment
- Post-installation checks
- Recurring blockage investigation
- Drainage maintenance planning
- Repair specification
- No-dig lining assessment
- Post-repair verification
Related Commercial Drainage Services
- CCTV Drain Surveys
- Blocked Drain Services
- UV Drain Lining & No-Dig Repair
- Robotic Cutting & Drain Preparation
- Jet Vac Drainage Services
Need a Commercial CCTV Drain Survey?
AJS Environmental can inspect underground drainage, identify restrictions and defects, and provide evidence for maintenance or repair planning.
Commercial Drainage Support
AJS Environmental provides CCTV surveys, drainage maintenance, cleaning, robotic cutting and no-dig repairs across Essex, London, Kent, Hertfordshire and the South East.
Commercial CCTV Drain Survey FAQs
Why was a CCTV drain survey carried out at the Waitrose car park?
The survey was used to inspect newly installed channel drainage outlets, check for debris and obstructions and verify the condition of the connected drainage.
What did the Waitrose drain survey find?
The surveyed outlets were clear of significant debris and obstruction. Water-flow testing also showed free movement through the inspected drainage without significant restriction.
Can CCTV surveys be used on newly installed drainage?
Yes. CCTV inspection can be used after installation to check internal pipe condition, identify construction debris or restrictions and establish a recorded condition of the drainage.
What can a commercial CCTV drain survey identify?
CCTV inspection can identify conditions such as debris, blockages, roots, cracks, displaced joints, deformation, standing water and other visible drainage defects.
Can CCTV drain surveys be carried out without excavation?
Yes. Where suitable drainage access is available, camera equipment can normally inspect the pipe internally without excavating the full drainage run.
How often should commercial drains be surveyed?
There is no universal interval suitable for every commercial property. Inspection frequency should reflect the site’s drainage history, usage, debris exposure, flooding risk, maintenance requirements and condition.
Can CCTV be combined with water-flow testing?
Yes. CCTV provides visual information about internal pipe condition, while water testing can provide additional information about how water is moving through the inspected drainage.
What happens if a commercial CCTV survey finds damage?
The findings can be used to determine whether cleaning, robotic cutting, patch repair, UV lining, no-dig repair or conventional excavation is appropriate.
Does AJS Environmental provide commercial CCTV drain surveys?
Yes. AJS Environmental provides CCTV drainage surveys for commercial properties, managed sites, schools, public-sector environments and infrastructure drainage networks.
