Lignite Stream Assessment

Image of Lignite Stream. Summary of report findings

Originally noted by European settlers for its fine specimens of kauri (up to 6 foot in diameter), the Lignite Stream catchment still retains a significant area of bush cover (33%) and otherwise contains predominantly low density residential (33%) and rural land use (22%). Future development of the area is anticipated to involve conversion of 15% of the catchment currently in bush to low density residential use, and development of a further 1% of the catchment in bush for additional rural use. The stream retains considerable natural character and native riparian vegetation with minimal erosion and weed infestation.

Length		5.7km
Size Of Catchment		191ha
Vegetation Cover		49% (94ha), in the northern and central catchment.
Imperviousness		17%
District Plan Land Use	Business	<1%
	Recreation	18%
	Residential	47%
	Road	11%
	Rural	23%
Recreational Use		Low, no significant known public use.
Receiving Environment		Upper arm Hellyers (Oruamo) Creek, Upper Waitemata Harbour.
Substrate		Predominantly bedrock. Silt/mud Tributary 2 resulting from bank erosion.
Natural Wetlands		Nil.
Artificial Wetlands		Nil.
Periphyton		Below nuisance levels.
Macrophytes		No significant densities or management issues.
Macroinvertebrates		No data.
Fish		7 species of native fish + koura.
Potential Man-Made Barriers to Fish Passage to Upstream Habitat		1 (+ 5 natural potential barriers).
Channel Modification		Nil.
Erosion around Structures		3 structures with slight erosion, 4 with severe erosion.
Bank Erosion		Slight throughout the majority of the stream, moderate erosion in Tributary 2, and minor in Tributary 1.
Temperature		No data.
Suspended Solids, Turbidity And Visual Clarity		Suspended solids 3 - 24 g/m³, NTU 6.7 - 12, overall clarity average relative to other North Shore streams.
Oxygen and Oxygen Demand		Oxygen demand below detection levels (<2.0g/m³).
Nutrients		0.02 and 0.04 g/m³ ammonia, nitrate 0.184 and 0.257mg/l.
Contaminants		Typical of North Shore streams, low zinc.
Bacteria and Pathogens		Levels of indicator bacteria indicate the stream is not suitable for contact recreation.
Sediment Quality		No data.
Debris		Moderate organic debris in Tributary 2, otherwise no significant debris.
Stream Grouping	Group 2, High value low disturbance	84%
	Group 3a, Urban semi-modified	13%
	Group 3b, Urban modified	-
	Group 4, Concrete lined channel	-
	Group 5, Piped section	2%

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