Drone inspection of water infrastructure in France: tanks, ponds, dams

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October 2026latest revision of this guide

• Primary sources: Légifrance, EUR-Lex, Géoportail, DGAC, service-public.fr, EASA.
• Every figure linked to its source, dated in the last chapter.
• Dated updates: you always read the latest version.

Built on the frameworks of the European Union (regulations 2019/945 and 2019/947), EASA, the DGAC and the DSAC.

Who it is for

• Water utilities, drinking-water and wastewater syndicates and operators inspecting their water towers, reservoirs and walk-in structures in France
• Local authorities in charge of flood prevention or stormwater following retention ponds, embankments and impoundments
• Owners and managers of reservoirs and small dams (irrigation associations, operators, municipalities)
• Engineering firms and foreign asset managers who subcontract aerial capture for an inspection in France

Contents of the complete guide

1. What drones bring to water infrastructure, and what they do not (free extract below)
2. Who is responsible, who authorises, who intervenes
3. Water towers and reservoirs: the exterior
4. Water towers and reservoirs: the interior, a confined-space operation
5. Ponds, impoundments, embankments and dams
6. Networks, treatment plants and catchments
7. The flight and work framework
8. The specification and deliverables
9. Checking the report, deciding, comparing offers
10. Templates to copy: specifications, preparation, acceptance, letter
11. Sources and consultation dates

Included: 19 checklist items and 6 decision or reference tables.

Introduction

Water infrastructure ages out of sight. The concrete of a water tower carbonates and spalls over the rebar, a tank's waterproofing loses its flexibility, a retention pond fills with sediment, an embankment is burrowed by animals, a sewer corrodes under hydrogen sulphide. Inspecting them is expensive and exposes people: aerial platforms, rope access, draining, entry into confined spaces. The drone does not remove these constraints; it reduces many of them, provided it is commissioned for the right mission with the right requirements.

This guide is written for the owner and operator of a structure in France. It tells you which mission suits which structure, what the drone can see and what it never will, how to prepare an internal tank inspection for what it is (confined-space work), how to write the specification and the expected defect rating, how to check the report and link it to the structure's own obligations (classified dams, asset management), and how to compare offers. It ends with templates: specifications, inspection preparation sheet, acceptance record, letter to the water tower's tenants.

The guide is up to date as of 23 October 2026. It relies on the French Labour Code and French health insurance recommendations for confined spaces (R447, R472, the INRS reference document for the CATEC scheme), on the Environment Code and the decree of 12 May 2015 for dams, on an official leaflet from the regional environment authority of Occitanie (DREAL), on drone regulations and on published studies whose DOIs are given. Standards cited are paid documents and are not reproduced. French terms are given in brackets where your French counterparts will use them.

What drones bring to water infrastructure, and what they do not

Four families of missions

1. External visual inspection: the drone photographs façades, tank, dome, parapets, guardrails, crests and slopes at close range and high resolution. It often replaces the aerial platform or rope access for the survey phase.
2. Internal inspection: a compact drone in a protective cage, with on-board lighting and no GPS, flies inside a tank, a walk-in sewer or a gallery. It films what a person would see, without anyone entering.
3. Measurement: by photogrammetry, the drone produces a 3D model and an orthophoto used to measure siltation, usable capacity, crest settlement, or to compare two states over time. Under water, bathymetry is needed (green LiDAR or echo sounder).
4. Thermography: the infrared camera shows surface signatures (moisture, seepage, a buried pipe leak) that direct further investigation.

These missions are documented. Loyer, Lepreux and Genain described in 2016 the inspection and diagnosis of water towers from drone images (La Houille Blanche, DOI 10.1051/lhb/2016015). Erena, Atenza, García-Galiano, Domínguez and Bernabé combined drone photogrammetry and bathymetric surveys on 21 reservoirs of the Segura basin in Spain and measured an average capacity loss of 0.33% per year due to sedimentation (Water, 2019, DOI 10.3390/w11030445).

The decision table

Five questions before asking for a quote

1. What decision do you want to take? (Plan a rehabilitation, prioritise assets, prepare a regulatory inspection, cost a dredging operation, respond to an incident.)
2. Which structure and which part: exterior, interior, submerged part, surroundings?
3. What state will the structure be in on the day: in service, drained, at low level, dry?
4. Who is responsible for the structure and who grants access (utility, operator, owner, waterway manager)?
5. Who will interpret the images: the drone provider alone, or an engineer or engineering firm who signs the assessment?

What a drone inspection is not

• It is not a structural assessment. It locates and documents visible defects. Their severity, cause and remedy are decided on the basis of an assessment, with tests if needed.
• It is not a regulatory obligation fulfilled. For a classified dam, the in-depth technical inspection, monitoring report and instrumentation report have their own requirements; the drone feeds them.
• It is not a watertightness guarantee. Thermography directs; only contact investigation confirms a leak.

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Frequently asked questions

What does “Drone inspection of water infrastructure in France: water towers, reservoirs, ponds and dams” contain and how much is it?

For €29 VAT included (€24.17 excl. VAT), you get drone inspection of water infrastructure in France: water towers, reservoirs, ponds and dams: 11 chapters online, about 21 printable A4 pages and 6 ready-to-copy templates, to commission drone inspection of a drinking-water, wastewater or hydraulic structure in France (water tower, reservoir, tank, retention pond, impoundment, embankment, walk-in sewer) that serves asset management: choose the mission suited to the structure, prepare an inspection inside a tank as confined-space work, write the specification, require deliverables and defect rating, check the report, link the drone to the structure's French regulatory obligations and turn the results into works decisions.

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Right after payment you are redirected to the complete guide's page. Bookmark it, or print it to PDF (Ctrl+P or Cmd+P, “Save as PDF”). Stripe also emails you the receipt.

Do I get an invoice?

Yes: Stripe generates the invoice and emails it. You can enter your company name and VAT number at checkout. Seller: Lacangel Group (VAT FR21995268018); prices VAT included.

Is the guide kept up to date?

Yes. The guide's page is updated when the rules change; your access stays valid and you always read the latest version.

Which texts is the guide based on?

On the official texts in force (EU regulations, French decrees and codes), cited and dated with their links: you can check every rule at its source, which is authoritative. C-DRONE is an independent publisher.

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