Flood dyke freeboard safety margin
Vertical margin in centimetres between the water level and the crest of the protective dyke at the monitored site.
Unit: cm · Measurement: LENGTH · Scope: SITE · Comparability group: DIKE_FREEBOARD_CM_MONITORED_SITE
What this is not
Almost every serious error in operational data is a category error rather than an arithmetic one. These are the things this indicator shares a unit with and must never be combined with.
- A flood forecast. A margin is a present measurement, not a prediction of whether it will be exceeded.
- Dyke structural integrity, which is a different assessment.
How current a reading has to be
Current within 30 days, usable within 120 days, measured against the 2026-09-23 build rather than against the time you read this page. A static deployment cannot re-age itself, so the build date is the honest anchor.
Flood-defence freeboard and border dwell times respond to rainfall and staffing within weeks. A month-old reading is a fair description of present conditions; a four-month-old one is not.
Readings held (1)
- 95 cm — observed 2026-08-26, 28 days before the 2026-09-23 build
Source: Sentinel-2 Synthetic Aperture Radar Inundation Layer + Ministry of Water In-Situ Telemetry · Bentiu & Rubkona, Unity State (named only — no coordinate held) · Current · ANNOUNCED · evidence ev-00437
As the source states it: “95 cm”
What SSIP says about it
- Flood dyke freeboard safety margin: 95 cm, recorded 2026-08-26 by Sentinel-2 Synthetic Aperture Radar Inundation Layer + Ministry of Water In-Situ Telemetry. Inside this indicator's 30-day currency window as of 2026-09-23.
Rule: Take the most recent dated observation bound to this indicator and classify its age against the indicator's own freshness policy (30 days current, 120 days usable — Flood-defence freeboard and border dwell times respond to rainfall and staffing within weeks. A month-old reading is a fair description of present conditions; a four-month-old one is not.).
Does not establish: That the condition still holds today. This is the most recent reading SSIP holds, not a statement about 2026-09-23. A flood forecast. A margin is a present measurement, not a prediction of whether it will be exceeded.
What SSIP does not hold
- Two readings from one recorded change event at one site.
How to read this
Every figure on this page carries an evidence state — Verified, Operational, Announced, Estimated, Inferred, Disputed, Simulated, Reference or Unavailable — and each state has a stated definition. SSIP does not present an estimate as an observation, and it does not record a missing value as zero.
Read the methodology · Open the evidence ledger · See declared gaps
Related
All operational indicators · Operating picture · Coverage · Recorded changes · Evidence ledger
Cite, check and correct
Cite as: “Flood dyke freeboard safety margin · Operational indicator”. Strategic Systems Intelligence. https://ssintelligence.online/indicators/dike-freeboard. Last updated . Carry the evidence state with any figure you quote.
Methodology · Sources · Corrections — if a record here is wrong, the corrections log is where it is fixed in public.