Northboro Stream Assessment

Image of Northboro Stream. Summary of report findings

Northboro Stream catchment was one of the earliest areas of the City to undergo urbanisation reaching development capacity in the early 1900s. The area is predominantly residential (82%) with areas of road, a small amount of bush (2%), and some commercial use. The stream is the smallest stream surveyed and is highly modified. The majority of the stream is either piped or concrete lined and as such has limited habitat value. Only one tributary retains a natural substrate providing the only viable habitat for aqautic fauna in the catchment.

Length		0.7km
Size of Catchment		46ha
Vegetation Cover		5% (2ha), in the lower catchment alongside the lower main channel and Tributaries 1 and 1A.
Imperviousness		44%
District Plan Land Use	Business	1%
	Recreation	2%
	Residential	82%
	Road	15%
Recreational Use		Low, no significant known public use.
Receiving Environment		Shoal Bay + Waitemata Harbour.
Substrate		Predominantly artificial, silt/mud in Tributary 1 and sections of mud in Tributary 1A.
Natural Wetlands		1
Artificial Wetlands		Nil
Periphyton		Significant periphyton growth in a section of the main channel only but below nuisance levels.
Macrophytes		No management issues
Macroinvertebrates		No data
Fish		1 species of native fish
Potential Man-Made Barriers to Fish Passage to Upstream Habitat		Nil
Channel Modification		Significant, the majority of the stream is either piped or concrete lined.
Erosion Around Structures		1
Bank Erosion		Slight throughout due to concrete lining of the banks and stream bed. Moderate erosion in the (unlined) upper section of Tributary 1.
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		Minimal
Stream Grouping	Group 2, High value low disturbance	-
	Group 3a, Urban semi-modified	8%
	Group 3b, Urban modified	18%
	Group 4, Concrete lined channel	23%
	Group 5, Piped section	51%

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