Lake Pupuke Assessment

Summary of report findings

Lake Pupuke is the only lake of its type within the Auckland region. Sitting in a volcanic explosion crater formed approximately 140,000 years ago, the lake is an important ecological, geological, cultural, recreational and scenic resource. The relatively small surrounding catchment is developed, mainly for residential use. Lake water quality is relatively good in comparison to other lakes in the Auckland Region and has improved since the early-mid 20th century.

Area / Shoreline Length / Depth		110 hectares / 4.3 kilometres / 57 metres
Size Of Catchment		87 hectares
Vegetation Cover		16 hectares (18%)
Imperviousness		36 hectares (41%)
District Plan Land Use	Business	0.2%
	Recreation	19%
	Residential	49%
	Road	9%
	Rural	23%
Recreational Use		High – mainly water based
Receiving Environment		Subsurface discharge to Thorne Bay
Natural Wetlands		5 lacustrine (lake edge) wetlands
Artificial Wetlands		None. Stormwater treatment wetland proposed
Periphyton		At least 96 species recorded, four potentially toxic blue-green algae (cyanobacteria) occur
Macrophytes		Dominated by introduced eel grass Vallisneria gigantica and oxygen weed Egeria densa – management issues
Macroinvertebrates		Variety of species
Fish		Native – eels and common bully; variety of introduced species
Birds		Abundant and diverse range use lake and surrounding reserves for feeding and roosting
Riparian Vegetation		Limited
Shoreline Modification		44% of shoreline lined or reinforced
Shoreline Erosion		Approx. 5% of shoreline has slight erosion
Lake Type		Warm monomictic
Temperature		12 – 22+ oC, thermally stratified for most of the year
Suspended Solids, Turbidity And Visual Clarity		Relatively clear, low turbidity and suspended solids
Oxygen And Oxygen Demand		Good in upper layer, severely depleted in lower layer during summer / autumn
Trophic Status		Mesotrophic
Contaminants		No data
Bacteria And Pathogens		Generally low faecal coliforms
Sediment Quality		No data

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