Watershed erosion & sedimentation

Names and classification

Record type

threat

Kauaʻi occurrence and status

Recorded state

Active / storm-sensitive

Threats and conservation

Pressure source

Bare soil, roads, ungulates, fires, development and disturbed slopes

Exposure pathway

Eroded sediment enters streams/estuaries and reaches coral/coastal habitats

Consequences

Turbidity, smothering, altered substrate, reduced coral fitness and habitat degradation

Affected requirements

Stream substrate, water clarity, coral light/settlement and benthic habitat

Susceptibility

Streams, estuaries, reefs and soft-bottom systems downstream of disturbed watersheds

Reversibility

Reversible where erosion sources are stabilized; deposited legacy sediment may persist

Early warning indicators

Turbidity; suspended sediment; deposition; erosion scars; coral sediment stress

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/dofaw/kauai/plans/fencing/
• https://www.fisheries.noaa.gov/pacific-islands/ecosystems/coral-health-and-threats-pacific-islands
• https://dlnr.hawaii.gov/dofaw/files/2025/03/KWA-Detailed-Mgmt-Plan-2012_reduced-size-3.pdf

Connected Atlas records

• Perennial stream ecosystem · Ecosystems
• Intermittent stream ecosystem · Ecosystems
• Riparian corridor ecosystem · Ecosystems
• Estuary / muliwai ecosystem · Ecosystems
• Coral reef & colonized hardbottom ecosystem · Ecosystems
• Reef flat, backreef & lagoon mosaic · Ecosystems
• Nearshore soft-bottom sand & mud ecosystem · Ecosystems
• Riparian restoration & buffer protection · Threats & Conservation
• Watershed erosion & sediment-source control · Threats & Conservation
• Agricultural best-management practices & vegetated buffers · Threats & Conservation
• Reef water-quality management · Threats & Conservation
• Long-term ecological monitoring & adaptive management · Threats & Conservation