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Pollution controlCompleted

Iron Gates Fish Bypass Channel

Construction of a 1.8 km fish bypass channel around the Iron Gates I dam, restoring migration corridors for Danube sturgeon and other diadromous species.

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Đerdap / Iron Gates · HydroBASINS L8: 2060037820
Sept 2021 – Dec 2024
Elektroprivreda Srbije / Hidroelectrica Romania / WWF / Danube Sturgeon Task Force
180 ha · € 12.4M
Sub-basin location
HydroBASINS Level 8 polygon

Sub-basin boundary: HydroBASINS Level 8 (HYBAS_ID 2060037820) · Polygon is approximate at this zoom

Basin Health Impact
Before vs. projected after project contribution
Water QuantityNo signal
Before
60Risk
Water QualityNo signal
Before
55Risk
Riparian Habitat+6 pts
Before
68Risk
After
74Good
Composite BHS contribution+2 pts

Weighted: Quantity × 0.45 + Quality × 0.20 + Habitat × 0.35

Ground Validation
IoT sensors · Galileo/EGNOS certified
Bratislava Flow Gauge
Discharge
Galileo ±0.3m
Sentinel-1 SAR coherence
Satellite: 2350 m³/sIn-situ: 2210 m³/s
94% agreement
Iron Gates Turbidity Probe
Turbidity
Galileo ±0.5m
Sentinel-2 B04 reflectance
Satellite: 24 NTUIn-situ: 22.1 NTU
92% agreement

In-situ readings from Galileo/EGNOS-certified IoT devices validate satellite-derived indices. High agreement confirms satellite-based BHS scoring for CSRD E3-4 discharge evidence.

Delivery metrics

Budget
€ 12.4M
Area
180 ha
Timeline
Sept 2021 – Dec 2024
Status
Completed
Delivered
1.8 km bypass operational; first confirmed sturgeon passage 2024
Compliance exports
Two primary live clicks: project + compliance JSON
  • CSRD
    ESRS E3-4Water consumption, basin stress and restoration contribution evidence
  • CSDDD
    Article 8Adverse-impact mitigation programme linked to basin outcomes
  • SBTN
    Step 3 — QuantityFreshwater target-setting inputs at sub-basin level
  • TNFD
    LEAP — LocateNature-risk evidence for geolocated restoration activity
Using live score context
Using live basin score
Audit trail
Replay the evidence lineage for this stewardship project
  1. Project geography
    HydroBASINS Level-8 anchor and project centroid used for repeatable basin-level evidence generation.
    hybas=2060037820
center=22.45000, 44.68000
  2. Evalscript versions
    Pinned, content-addressed evalscripts. Replayable byte-for-byte.
    sentinel2-bhs-combined-v1@static-snapshot
outputs=ndwi,mndwi,ndvi,ndmi,turbidity,chla,bare
  3. Source scenes
    Recent STAC scene IDs attached to the basin score run for audit replay.
    No STAC scene IDs attached
  4. Scoring function
    Basin sub-indices weighted via bhs-v0.5.0.
    quantity*0.45 + habitat*0.35 + quality*0.2
  5. Computation provenance
    Run signature stored with the exported project evidence pack.
    run=static-snapshot · at=2026-04-28T19:56:41.330Z

Partners

Operator
Elektroprivreda Srbije / Hidroelectrica Romania
Partner
WWF / Danube Sturgeon Task Force

Basin context

Danube / Pannonian Basin
BHS 62 · 2 projects · 28M people
View all projects in Danube / Pannonian Basin →