Hydrogeology of Niue Island with Freshwater Layer Thickness and Aquifer Test Results

259 km^2 Niue Island is a raised coral atoll with a peripheral ridge 60 m high and an internal basin 35 m high. The dataset, from the Australian Ocean Data Network, includes results from drilling, gravity and magnetic surveys, and electrical resistivity probes, describing a freshwater layer 40-170 m thick that decreases near the coast. It was last updated on 2026-04-10.

Use Cases

• Model freshwater lens thickness and distribution based on electrical resistivity probe results
• Estimate groundwater safe yield based on recharge conditions and aquifer test data
• Analyze subsurface structure based on gravity and magnetic survey interpretations
• Study saltwater intrusion processes near the coast based on described mixing along fissures

Strengths

• Includes specific quantitative measurements: island area of 259 km^2, freshwater layer thicknesses of 40-170 m, and a safe yield estimate of 4000 m^3/year/hectare
• Describes results from multiple survey methods: drilling, gravity, magnetic, and electrical resistivity
• Provides concrete aquifer performance metrics: specific capacity of about 12 l/s per metre and a safe pumping rate of about 8 l/s

Limitations

• Column-level documentation is absent; field semantics must be inferred after download
• Row count is unknown, which may limit suitability assessment
• Data may reflect geographic bias inherent to data_gov_au

Provenance

Source

Australian Ocean Data Network

Collection Method

Drilling, gravity surveys, magnetic surveys, electrical resistivity depth probes, and aquifer tests

Time Range

null

Freshness

Last updated 2026-04-10 19:06:32.787999; freshness should be verified

Geography

Niue Island, South Pacific Ocean