Deep Creek Stream Assessment

Image of Deep Creek. Summary of report findings

Home to a number of permanent Maori residents in the early 1800s, Deep Creek (Waiake) later supported wine making, flax and saw milling, tobacco growing, sheep and cattle farming, and dairying. Most development in the catchment occurred following the opening of the Auckland Harbour Bridge in 1959 and the area is now fully developed. Deep Creek stream has been heavily modified during urbanisation of the catchment and retains little natural character.

Length		5km
Size Of Catchment		254ha
Vegetation Cover		14% (36ha)
Imperviousness		35%
District Plan Land Use	Business	<1%
	Recreation	4%
	Residential	78%
	Road	17%
Recreational Use		Low, no significant known public use.
Receiving Environment		Waiake Beach, Hauraki Gulf
Substrate		Silt/mud, gravel/mud or concrete (piped) throughout.
Natural Wetlands		Nil
Artificial Wetlands		Nil
Periphyton		Significant densities of diatomaceous algae in the upper main channel.
Macrophytes		Possible management issue in the lower main channel.
Macroinvertebrates		Moderate MCI score, low EPT taxa.
Fish		7 species of native fish
Potential Man-Made Barriers to Fish Passage to Upstream Habitat		6 (+ 2 potential natural barriers)
Channel Modification		Piped sections within every tributary except for Tributary 3 with 100% lined banks
Erosion around Structures		One outfall with slight erosion and three outfalls with moderate erosion.
Bank Erosion		Slight to moderate.
Temperature		One measurement taken indicates potential to cause mortality of sensitive macroinvertebrate taxa.
Suspended Solids, Turbidity And Visual Clarity		Suspended solids measured at 7 and 181g/m³, turbidity measured at 9.9 and 24 NTU, clarity average.
Oxygen and Oxygen Demand		Oxygen saturation may be an issue for aquatic life (at 52%), oxygen demand average for North Shore streams.
Nutrients		No data.
Contaminants		Below and above average copper, average and above average lead, and below average and well above average zinc levels relative to North Shore streams.
Bacteria and Pathogens		Levels of indicator bacteria indicate the stream is not suitable for contact recreation.
Sediment Quality		No data.
Debris		No significant inorganic or organic debris.
Stream Grouping	Group 2, High value low disturbance	-
	Group 3a, Urban semi-modified	23%
	Group 3b, Urban modified	44%
	Group 4, Concrete lined channel	7%
	Group 5, Piped section	26%

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