( Totals
Six totals
across eight sites.
3,412
homes behind our lines
Port-Aven, Vire-sur-Lône, Kesterhaven, Ballycarrow
12.27 km
of shoreline under watch
Four coastal and estuary sites
3,028 ha
of farmland under new practice
418,600 m³
of flood storage created
Field E-2, Vire-sur-Lône
31 h
median flood warning before the peak
River gauges, 2024–2026
€38.6 M
modelled avoided loss to 2035
Modelled, not measured
( Before and after
Vilamar, profile V-3:
the beach came back.
Dry beach width went from 18.2 m to 29.6 m between the 2021 and 2025 orthophotos, after sand fencing and marram planting on 3.10 km of dune.
Dry beach width, profile V-3: 18.2 m → 29.6 m · Atlantic Survey Review
( The register
Twelve entries,
each with its reviewer and its dates.
R-0417
Revetment R-4 & dune
Peak flood depth at the quay, 1-in-100
−41 cm
Kerrow & Lisle Hydrology
Verified
● Measured
● Reported
● Verified
R-0418
Revetment R-4 & dune
Dune crest level, profile P-2
+1.3 m
Atlantic Survey Review
Verified
● Measured
● Reported
● Verified
R-0422
Flood expansion field E-2
Peak flow at gauge V-07, Feb 2025
−27 %
Kerrow & Lisle Hydrology
Verified
● Measured
● Reported
● Verified
R-0423
Flood expansion field E-2
Flood storage in field E-2
+418,600 m³
Kerrow & Lisle Hydrology
Verified
● Measured
● Reported
● Verified
R-0431
Cover crops & keyline ponds
Soil organic carbon, 0–30 cm
+0.47 pt
Northfield Soil Laboratory
Verified
● Measured
● Reported
● Verified
R-0432
Cover crops & keyline ponds
Days of soil moisture below wilting point
−15 days
Northfield Soil Laboratory
Reported
● Measured
● Reported
R-0438
Polder overflow & saltmarsh
Wave height at the dike toe
−38 %
Atlantic Survey Review
Reported
● Measured
● Reported
R-0439
Polder overflow & saltmarsh
Saltmarsh area above mean high water
+62 ha
Atlantic Survey Review
Verified
● Measured
● Reported
● Verified
R-0446
Dune restoration
Dry beach width, profile V-3
+11.4 m
Atlantic Survey Review
Measured
● Measured
R-0451
Leaky dams & wet woodland
Delay to the flood peak at Vire-sur-Lône
+3 h 40 min
Kerrow & Lisle Hydrology
Reported
● Measured
● Reported
R-0455
Estuary setback levee
Peak water level at the quay
−0.62 m
Atlantic Survey Review
Measured
● Measured
R-0459
Hedgerows & infiltration strips
Infiltration rate, test plots
+38 mm/h
Northfield Soil Laboratory
Measured
● Measured
( How we verify
Four steps between a sensor
and a number on this page.
01 Baseline
Before we build, we measure the site for at least one season and lodge the figures with the client.
02 Measure
Sensors read every ten minutes; lab cores and surveys follow a fixed calendar.
03 Report
A public report every month, with the raw readings and the method.
04 Verify
Once a year an outside reviewer checks the register line by line and signs it.
BREAKWATER · IMPACT REPORT
2025–26
12 register entries · 8 sites · 214 sensors
Reviewed by Kerrow & Lisle Hydrology, Northfield Soil Laboratory and Atlantic Survey Review
( Annual report
Every register entry to date,
in one signed document.
Forty-two pages: the method, the twelve register entries with their raw data, and the reviewers’ letters.
( Questions