Arranging a manned climb of a water tower means rope access teams, safety procedures, and days of setup before the first image is captured. A drone survey typically covers the full tank exterior, supporting structure, access ladders, vents, and surrounding ground-level infrastructure in a single flight — no climbing, no scaffolding, no one working at height.
Thermal imaging can add a capability that visual inspection alone cannot provide — detecting moisture penetration and insulation defects in the tank shell before they become visible externally.
What can a drone detect on a water tower?
Tank shell corrosion and coating failure, structural cracks and concrete spalling, joint and seal integrity, supporting structure condition (corrosion, deformation), and ladder and access equipment condition.
Where thermal imaging is used, moisture penetration and insulation defects in the tank shell can be identified before surface evidence appears.
See what thermal imaging can detectDoes the water tower need to be taken out of service?
No. An external drone survey operates at a safe standoff distance and does not interact with the tank or its contents. The inspection can be carried out while the tower remains fully in service, supplying water to the community.
No draining, no decommissioning, and no disruption to water supply are required.
Discuss your site requirementsWhat about working at height regulations in Ireland?
The Safety, Health and Welfare at Work (Work at Height) Regulations 2006 (S.I. No. 318 of 2006) require that work at height be avoided where it is reasonably practicable to do so. A drone survey satisfies this requirement at the first step of the hierarchy of control — the inspection is carried out from a safe standoff distance with no personnel working at height.
Because no one leaves the ground, the duties to provide fall protection, guardrails, or rescue arrangements for work at height do not arise.
More about our regulatory complianceWhat is the turnaround time for a water tower inspection?
A typical water tower inspection can be completed in a single site visit. The full annotated condition report is typically delivered within a few working days of the inspection.
Every site is different, so timelines are confirmed before any work begins based on the specific structure and the deliverables required.
Discuss your inspection timelineA single flight covers the full tank exterior, roof, and base from a safe standoff distance — regardless of tower height. No climbing, no scaffolding, and no one working at height. What a drone survey can detect externally: tank shell corrosion and coating failure, structural cracks, concrete spalling, joint and seal integrity, and supporting structure condition.
Can a drone inspect the tank roof and underside?
Yes. The drone can view the tank from all angles including the roof and the underside of any overhanging sections — perspectives that are difficult or impossible to achieve safely from a ladder or rope access position.
The drone operates at a safe standoff distance and never makes contact with the structure.
Discuss your inspection requirements
Where access to the tank interior is required, a cage-protected confined space drone can enter through the access hatch and inspect the full interior — walls, floor, roof underside, and all internal fittings — without any person entering the tank. No confined space entry permit, no draining, and no standby rescue team to arrange.
What a confined space drone can detect internally: concrete spalling and cracking from freeze-thaw cycling, rebar corrosion where the steel reinforcement has been exposed to water, sediment and sludge buildup on the tank floor, and coating or lining failures where the epoxy or waterproof barrier has deteriorated. Every defect is recorded on 4K video with still photography for inclusion in the inspection report.
Does the tank need to be drained for an internal drone inspection?
Whether a confined space drone can enter a tank that is in service depends on the specific site conditions — water level, access hatch position, and internal atmosphere. Every site is assessed individually before any work begins to confirm feasibility. Where the tank can be taken offline temporarily, a full internal survey can be completed without draining it below the level needed for hatch access.
The key point: no person enters the tank. The drone goes in, the pilot and the inspection team remain outside.
More about confined space drone inspectionsWhat confined space regulations apply to water tower inspections in Ireland?
The Safety, Health and Welfare at Work (Confined Spaces) Regulations 2001 (S.I. No. 218 of 2001) require that a person shall not enter a confined space unless it is not reasonably practicable to carry out the work without entry. A confined space drone inspection satisfies this requirement at the first step — the inspection is completed without any person entering the tank.
Because no human entry takes place, there is no confined space entry permit to prepare, no atmospheric testing regime to stand up, and no standby rescue team to arrange. The regulation’s core duty is satisfied without progressing beyond the first obligation.
More about our regulatory compliance
As engineers, we know what to look for. Beyond the tank shell, every inspection assesses the supporting structure — columns, bracing, base fixings — for corrosion, deformation, and foundation condition. The drone captures all surfaces from multiple angles, providing a complete structural record in a single deployment.
Thermal imaging can detect moisture penetration and insulation defects in the tank shell before they become visible externally. Temperature differences caused by water ingress or failing insulation create a thermal signature that a trained thermographer can identify from the air — a capability that visual inspection alone cannot provide. All EWD drone operators are trained thermographers.
What does thermal imaging reveal that visual inspection misses?
Moisture penetration behind coatings and insulation defects within the tank shell can create temperature differences of a few degrees that are invisible to the naked eye but detectable by a thermal camera. Identifying these early allows repairs to be scheduled before coating failure or corrosion becomes visible externally.
All EWD drone operators are trained thermographers, meaning thermal data is captured and interpreted by qualified personnel rather than relying on automated camera settings alone.
More about our thermal imaging services
A water tower is more than its tank. Overflow pipes regulate pressure; vents allow air exchange without letting contaminants in; access ladders and safety cages must be structurally sound for the maintenance crews who will eventually climb them; lightning conductors protect the structure and the water supply. A drone can assess every one of these components from the air in the same flight that surveys the tank shell — no separate visit, no climbing required.
Why do components need their own inspection focus?
A tank shell in good condition means little if a failed vent screen has been letting birds or insects into the water supply, or if a corroded overflow pipe is leaking and undermining the foundation. Components fail differently to the tank shell — they have moving parts, finer tolerances, and direct contact with the water column — and their failure can contaminate the supply even when the tank itself is structurally sound.
Screening measures in particular are a water-quality issue. Caps and wire mesh that have deteriorated or detached are an open route for contaminants. A drone can assess these from inches away without any person climbing to reach them.
Discuss your inspection requirementsCan a drone really inspect something as small as a vent screen or a bolt?
Yes. The drone carries a high-resolution stabilised camera that can capture fine detail from a close standoff distance — mesh condition, corrosion on individual bolts, cracks around fixings, and seal integrity at joints. The pilot can hold position and zoom in on a single component for as long as needed, capturing stills and video from multiple angles.
The same inspection that surveys the full tank exterior can pause to examine a vent screen, a ladder rung, or a lightning conductor clamp in forensic detail — all without anyone leaving the ground.
Discuss your inspection requirements
A photogrammetric 3D model generated from drone imagery gives you a dimensioned digital record of the entire structure — every surface, every component, every defect captured in three dimensions. Unlike photographs, which show what the structure looks like, a 3D model shows exactly where every surface is in space, enabling measurements, cross-sections, and comparison against previous inspections to track change over time.
What is a 3D model from drone data?
The drone captures hundreds of overlapping high-resolution images from multiple angles around the structure. Photogrammetry software analyses these images to identify common points, triangulating their positions in three-dimensional space to produce a dense point cloud — millions of individual data points, each with an X, Y, and Z coordinate.
This point cloud is then surfaced with a textured mesh created from the original imagery, producing a dimensionally accurate 3D model that can be rotated, zoomed, measured, and sectioned — all without returning to the site.
More about our 3D mapping and digital twinsWhat can a 3D model do that photographs cannot?
A photograph shows you a defect. A 3D model tells you exactly how big it is, where it sits in relation to other defects, and whether it has grown since the last inspection. You can measure crack lengths, spalling areas, and coating loss directly on the model — no need to estimate from imagery.
The model also becomes a repeatable baseline. Compare this year’s model against next year’s and every change is quantifiable — corrosion spread, new cracking, structural movement. Stakeholders who have never visited the site can inspect the structure virtually, take measurements, and understand the condition without specialist software.
Discuss what a 3D model could reveal about your towerFull exterior coverage from a safe standoff distance. No rope access teams, no safety procedures, no one working at height — regardless of tower height.
The drone operates at a safe standoff distance and does not interact with the tank or its contents. No draining, no decommissioning, no disruption to water supply.
Tank shell, roof, base, supporting structure, access ladders, vents, and ground-level infrastructure all captured in a single deployment.
Identifies moisture penetration and insulation defects in the tank shell before they become visible externally — captured and interpreted by trained thermographers.
Every surface photographed in detail from multiple angles. No contact with the structure, no detail lost — first-rate imagery for condition assessment.
Water towers are often in remote locations. A drone team can mobilise quickly with no specialist access equipment to transport or set up.
Arranging a manned climb of a water tower means rope access teams, safety procedures, and days of setup. A drone survey can cover the full tank exterior, supporting structure, access ladders, vents, and surrounding ground-level infrastructure in a single flight — with no one working at height, no scaffolding, and no specialist access equipment to transport to a remote site.
Thermal imaging can detect moisture penetration and insulation defects in the tank shell before they become visible externally. Temperature differences caused by water ingress or failing insulation create a thermal signature that a trained thermographer can identify from the air. All EWD drone operators are trained thermographers, so thermal data is captured and interpreted by qualified personnel — not left to automated camera settings.
Tell us what you need to know, and we will work with you to design actionable deliverables that give you the outcomes you need.
A typical water tower inspection delivers a full photographic survey of the tank and supporting structure, with high-resolution imagery of every surface from multiple angles. Where thermal imaging is included, each identified thermal anomaly is recorded with a corresponding visual-reference image. A photogrammetric 3D model can also be generated from the same drone imagery, giving you a dimensioned digital twin of the structure that can be measured, sectioned, and compared against future inspections.
Faults are compiled into an annotated condition report: each defect described, categorised, and located — ready to hand directly to your maintenance or repair team.
Tank shell, supporting structure, ladders, vents, and ground-level infrastructure photographed from multiple angles.
Moisture penetration and insulation defects identified and recorded with visual-reference imagery, where applicable.
Each defect described, categorised, and located. Structured for direct handover to maintenance and repair teams.
A dimensioned photogrammetric model generated from the same drone flight. Measure, section, and compare year-on-year to track every change.
Engineers With Drones carried out a detailed inspection of a large above-ground galvanised steel water tank used for fire suppression, using a confined space drone to access the interior.
Complex surveys and inspections require more than just a pilot. Our engineers can help you scope your requirements and indentify the right approach.
