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Wave Gauge - NIWA DOBIE
https://niwa.co.nz/our-services/instruments/instrumentsystems/products/water-level-instruments/dobie
Clear as mud? Predicting water clarity and light penetration in estuaries
https://niwa.co.nz/freshwater/freshwater-update/freshwater-update-53-may-2012/clear-as-mud-predicting-water-clarity-and-light-penetration-in