Ngataringa Stream Assessment

Image of Ngataringa Stream. Summary of report findings

Ngataringa Stream catchment is amongst one of the oldest areas within the City and was fully developed during the late 1800s and early 1900s. The catchment and stream have been highly modified due to reclamation of a large portion of Ngataringa Bay. Natural drainage within the catchment has been significantly altered with flow being directed around the inland margin of the reclamation before discharging to the north of Ngataringa Bay. The majority of the channel is concrete lined and the morphology of two remaining small sections of open watercourse have also been altered.

Length		2.0km
Size Of Catchment		120ha
Vegetation Cover		9% (10.1ha), distributed throughout the catchment.
Imperviousness		36%
District Plan Land Use	Business	<1%
	Recreation	34%
	Residential	50%
	Road	16%
Recreational Use		Low, no significant known public use.
Receiving Environment		Ngataringa Bay, Shoal Bay, Waitemata Harbour.
Substrate		Predominantly concrete.
Natural Wetlands		Nil.
Artificial Wetlands		2
Periphyton		At nuisance levels throughout the stream except Tributary 1A.
Macrophytes		No management issues.
Macroinvertebrates		No data.
Fish		No species of native fish found. Local resident observations of eels and possibly banded kokopu.
Potential Man-Made Barriers to Fish Passage to Upstream Habitat		2
Channel Modification		The most modified stream surveyed on the North Shore with only two short lengths of unlined channel.
Erosion around Structures		Nil.
Bank Erosion		Only slight erosion at the head of the main channel and in Tributary 1A, no other erosion present due to concrete lining and piping of watercourse.
Temperature		No data.
Suspended Solids, Turbidity And Visual Clarity		Relatively clear compared to other North Shore streams.
Oxygen and Oxygen Demand		No data.
Nutrients		No data.
Contaminants		No data.
Bacteria and Pathogens		No data.
Sediment Quality		No data.
Debris		Insignificant.
Stream Grouping	Group 2, High value low disturbance	-
	Group 3a, Urban semi-modified	7%
	Group 3b, Urban modified	10%
	Group 4, Concrete lined channel	70%
	Group 5, Piped section	13%

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