Breakwater
+0.00
m NGF
Port-Aven tide gauge · PA-1
( The water
The hundred-year flood
now comes back
every twelve years.
On the Port-Aven quay, five floods since 1910 are cut into the granite. Three of them came in 2010 or later. The defences behind them were drawn for a sea that no longer exists.
Quay wall, Port-Aven
2024 · +2.47 m
2018 · +2.21 m
2010 · +2.04 m
1953 · +1.88 m
1910 · +1.62 m
Return period of the +2.0 m quay level: 1-in-100 (1950) → 1-in-12 (2024)
Illustrative figures for a demo company.
( Three fronts
Built for the water
that is already on its way.
Every project starts with a hindcast of 120 years of storms, floods and dry summers on your site. We design the defence the model asks for, build it with local crews, then publish the readings so the city, the insurer and the funder see the same number.
( How a site runs
One method,
from the first storm record
to the last reading.
0 m
120 m
01 — Hindcast
We replay 120 years of storms, river flows and dry spells on a 2 m terrain model of your site, then show you what the next fifty look like.
6 to 9 weeks
02 — Design
The defence the model asks for: a dune, a flood field, a hedge line. Never a wall by default, and every option priced.
Signed off with your engineers
03 — Build
Local crews, local stone, and our site lead on the ground every working day until handover.
4 to 14 months
04 — Measure
Sensors stay for ten years. A reading every ten minutes, checked once a year by an outside reviewer.
Public readings
( Who stays on site
Twenty-two years on harbour walls and river banks taught us one thing. A defence is only finished when someone keeps measuring it, so our field team stays on every site for ten years after handover.
( Measured, not modelled
Every number on this page
has a sensor behind it.
A baseline before we build, a reading every ten minutes after. An outside reviewer checks the register once a year, and every entry stays public.
R-0417
BW-01
Peak flood depth at the quay, 1-in-100
1.12 m
→
0.71 m
Verified
● Measured
● Reported
● Verified
R-0422
BW-02
Peak flow at gauge V-07, Feb 2025
412 m³/s
→
301 m³/s
Verified
● Measured
● Reported
● Verified
R-0431
BW-03
Soil organic carbon, 0–30 cm
2.31 %
→
2.78 %
Verified
● Measured
● Reported
● Verified
R-0438
BW-04
Wave height at the dike toe
1.46 m
→
0.91 m
Reported
● Measured
● Reported
R-0446
BW-05
Dry beach width, profile V-3
18.2 m
→
29.6 m
Measured
● Measured
Illustrative figures for a demo company.
( Where we work
Eight sites,
each one still measured.
BW-02
Flood expansion field E-2
Vire-sur-Lône
France
Coordinates
46.9184° N, 0.4127° W
Commissioned
Structure
Spillway, earth bunds and 418,600 m³ flood field
Scale
418,600 m³ of flood storage
Partner
Lône-Vire Water Agency
Status
Operational
−27 %
peak river flow, Feb 2025 flood
BW-04
Polder overflow & saltmarsh
Kesterhaven
Netherlands
Coordinates
53.1871° N, 4.8113° E
Commissioned
Structure
Managed realignment, 62 ha saltmarsh
Scale
4.62 km of dike front
Partner
Kesterhaven Water Board
Status
Operational
−38 %
wave height at the dike toe
BW-05
Dune restoration
Vilamar
Portugal
Coordinates
40.4413° N, 8.7956° W
Commissioned
Structure
Sand fencing, marram planting and walkways
Scale
3.10 km of dune front
Partner
Vilamar Municipal Chamber
Status
Monitoring
+11.4 m
dry beach width, profile V-3
BW-07
Estuary setback levee
Ballycarrow
Ireland
Coordinates
52.6738° N, 8.9161° W
Commissioned
Structure
Levee set back 180 m, 2.71 km
Scale
2.71 km of estuary bank
Partner
Ballycarrow County Council
Status
Operational
−0.62 m
peak water level at the quay
( Signed with the city
Public money asks for proof.
Ours is written into the contract.
Framework agreements, public tenders and ten-year monitoring lots. Every contract names the indicator we answer to, and we report against it in public, every month.
4 agreements · scroll →
AGREEMENT PA-2021-033
City of Port-Aven
Coastal works and ten-year monitoring, Port-Aven harbour front
Lot 1 · Dune and revetment works
Lot 2 · Tide, wave and settlement sensors
Lot 3 · Monthly public report
Sep 2021
Works handed over
Mar 2022
First annual report
Mar 2024
Independent review
Mar 2026
Mid-term renewal
Contract indicator
Peak flood depth at the quay under 0.80 m for a 1-in-100 event.
Last reading 0.71 m · within
“They gave us one number to hold them to, and they publish it every month.”
Anne-Laure Kervella
Deputy Mayor for the Coast, City of Port-Aven
Term 2021–2031
Value €4.82 M
AGREEMENT LV-2022-114
Lône-Vire Water Agency
Flood storage, headwater works and catchment monitoring
Lot 1 · Flood expansion field E-2
Lot 2 · Leaky dams, Haut-Lône headwaters
Lot 3 · Gauges and quarterly public report
Apr 2022
Field E-2 commissioned
Feb 2024
146 dams in place
Feb 2025
First flood held, report published
Jan 2027
Five-year review
Contract indicator
Peak flow at gauge V-07 at least 20 % below the 2001 rating for the same rainfall.
Last flood −27 % · within
“We bought storage we can measure, not a promise about the next flood.”
Marc Delorme
Head of Flood Risk, Lône-Vire Water Agency
Term 2022–2032
Value €7.16 M
AGREEMENT KH-2023-008
Kesterhaven Water Board
Managed realignment and saltmarsh behind the outer dike
Lot 1 · Dike breach and overflow sill
Lot 2 · Saltmarsh planting, 62 ha
Lot 3 · Wave and sediment monitoring
Jun 2023
Overflow sill opened
Aug 2025
62 ha above mean high water
Jan 2026
First storm season reported
Jun 2026
Independent review
Contract indicator
Wave height at the dike toe reduced by at least 30 % in a 1-in-10 storm.
Last storm −38 % · within
“The marsh does the work the dike used to do alone. We can see it in the wave readings.”
Pieter Hoekstra
Dike Warden, Kesterhaven Water Board
Term 2023–2033
Value €5.41 M
AGREEMENT BC-2024-051
Ballycarrow County Council
Estuary setback levee and quay monitoring
Lot 1 · Setback levee, 2.71 km
Lot 2 · Intertidal habitat on the old bank
Lot 3 · Quay gauge and annual report
Sep 2024
Levee commissioned
Jan 2026
First flood season measured
Sep 2026
First annual report
Sep 2029
Five-year review
Contract indicator
Peak water level at the quay at least 0.40 m below the 2019 reference event.
Last reading −0.62 m · within
“The town stopped sandbagging the quay. That is the number people here care about.”
Siobhán Rourke
Senior Engineer, Ballycarrow County Council
Term 2024–2034
Value €3.07 M
( Start with a reading
Tell us where
the water comes in.
— A stretch of coast, a river reach or a block of farmland
— The last flood or dry summer you remember
— Who has to sign off
We reply within ten working days with a first hindcast and what it would take to hold it.