Aquatic barriers & channel alteration

Names and classification

Record type

threat

Kauaʻi occurrence and status

Recorded state

Active / site-specific

Threats and conservation

Pressure source

Culverts, diversions, dams, channelization and hardened crossings

Exposure pathway

Blocks or changes organism passage, hydraulics, sediment transport and channel habitat

Consequences

Fragmentation, altered flow/velocity, habitat simplification and migration failure

Affected requirements

Amphidromous movement, natural channel morphology and riparian connectivity

Susceptibility

Native stream fishes/invertebrates and connected estuaries

Reversibility

Often reversible with barrier removal/retrofit, though legacy channel change may persist

Early warning indicators

Passability; perched outlets; velocity/depth; blocked migrations; channel complexity

Conservation interventions

Implementation limits

Magnitude, exposure and trend are not assumed uniform across Kauaʻi; local evidence governs.

Sources and further reading

• https://dlnr.hawaii.gov/cwrm/surfacewater/
• https://dlnr.hawaii.gov/wildlife/files/2026/03/FINAL-2025-SWAP.pdf

Connected Atlas records

• Perennial stream ecosystem · Ecosystems
• Intermittent stream ecosystem · Ecosystems
• Riparian corridor ecosystem · Ecosystems
• Estuary / muliwai ecosystem · Ecosystems
• Reservoir, ditch & canal aquatic system · Ecosystems
• Fish-passage & aquatic-barrier remediation · Threats & Conservation