Taiorahi Creek Assessment

Image of Taiorahi Creek. Summary of report findings

Real development of the Taiorahi Creek catchment occurred following the opening of the Auckland Harbour Bridge in 1959 and during the early 1970s. The catchment is now largely developed to capacity and land use is predominantly low density residential. The Taiorahi Creek while typical of many urban streams located on the North Shore, with numerous stormwater inputs, lined channels and degraded habitats, also exhibits many attributes associated with less degraded watercourses, including excellent native bush cover in the upper catchment, a good variety of fish species, and excellent water clarity.

Length		2.2km
Size Of Catchment		139ha
Vegetation Cover		19% (27ha), surrounding the upper main channel.
Imperviousness		37%
District Plan Land Use	Business	0.3%
	Recreation	6%
	Residential	79%
	Road	15%
Recreational Use		Medium, some known public use of the stream locality.
Receiving Environment		Murrays Bay Beach, Hauraki Gulf.
Substrate		Silt/mud, concrete and gravel throughout.
Natural Wetlands		2
Artificial Wetlands		1
Periphyton		Below nuisance levels except for the lower main channel with poor/nuisance diatomaceous algae present as a likely result of limited overhead cover causing higher temperatures.
Macrophytes		No management issues.
Macroinvertebrates		MCI & EPT taxa range from low to high compared to other North Shore streams.
Fish		5 species of native fish + koura.
Potential Man-Made Barriers to Fish Passage to Upstream Habitat		8 (+ 1 natural potential barrier).
Channel Modification		Unmodified except for Tributaries 1, 1A, 1B and 2.
Erosion around Structures		Significant modification, mainly within the lower catchment.
Bank Erosion		Slight to nil (within modified sections).
Temperature		April 1999 20.8 ° C, potential to cause mortality of sensitive macroinvertebrates.
Suspended Solids, Turbidity And Visual Clarity		4 - 13g/m³ suspended solids, very good clarity up to 0.8 metre.
Oxygen and Oxygen Demand		6.8g/m³.
Nutrients		No data
Contaminants		No data
Bacteria and Pathogens		Levels of indicator bacteria indicate the stream is not suitable for contact recreation..
Sediment Quality		No data
Debris		No significant debris.
Stream Grouping	Group 2, High value low disturbance	-
	Group 3a, Urban semi-modified	28%
	Group 3b, Urban modified	36%
	Group 4, Concrete lined channel	11%
	Group 5, Piped section	23%

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