Kahika Stream Assessment

Image of Kahika Stream. Summary of report findings

The Kahika Stream catchment has been developed for residential use relatively recently during the last 30-50 years. Prior to this the area was in rural use supporting fruit farming and before that was cloaked with kauri forest for thousands of years. The catchment now has 81% residential land use, along with areas of road (13%) and bush (6%), and is largely developed to capacity. Surrounding urban development has affected the stream by increasing flows resulting in erosion of the stream bed and banks.

Length		4.6km
Size of Catchment		181ha
Vegetation Cover		22% (39ha), largely following the stream course.
Imperviousness		30%
District Plan Land Use	Business	<1%
	Recreation	7%
	Residential	81%
	Road	13%
Recreational Use		Medium, some known public use of the stream locality.
Receiving Environment		Kaipatiki Creek, Hellyers (Oruamo) Creek, Upper Waitemata Harbour.
Substrate		Primarily silt/mud with sections of bedrock in the upper main channel and Tributary 7. Heavy sediment deposition throughout.
Natural Wetlands		0
Artificial Wetlands		1
Periphyton		Below nuisance levels.
Macrophytes		No management issues.
Macroinvertebrates		Indicative condition in the lower Kahika Stream is considered moderate and in the upper section of the stream is poor.
Fish		5 species of native fish + koura.
Potential Man-Made Barriers to Fish Passage to Upstream Habitat		5 (+ 6 natural potential barriers).
Channel Modification		Nil.
Erosion around Structures		Amongst the worst on the North Shore, 40% of structures have some erosion. 5 structures with slight erosion, 6 with moderate erosion, and 8 with severe erosion.
Bank Erosion		Significant erosion throughout ranging from slight to moderate.
Temperature		Generally low but likely to be higher during summer.
Suspended Solids, Turbidity And Visual Clarity		Typical for urban streams.
Oxygen and Oxygen Demand		Good oxygen saturation levels, dissolved oxygen of 8.3 and 8.2 g/m³. A range of oxygen demand levels.
Nutrients		Median ammonia 0.05 mg/l. Nitrate 0.147 and 0.368 mg/l.
Contaminants		Typical for North Shore streams.
Bacteria and Pathogens		Levels of indicator bacteria indicate suggest the stream is not suitable for contact recreation.
Sediment Quality		No data.
Debris		Significant inorganic and organic debris.
Stream Grouping	Group 2, High value low disturbance	12%
	Group 3a, Urban semi-modified	48%
	Group 3b, Urban modified	39%
	Group 4, Concrete lined channel	-
	Group 5, Piped section	-

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