Little Shoal Bay Stream Assessment

Image of Little Shoal Bay Stream. Summary of report findings

Development of the Little Shoal Bay Stream catchment began during the late 1800s and early 1900s, and in 1918 Edward Le Roy purchased much of the area, installing lily ponds, culverting the stream and introducing flora and fauna from other areas of New Zealand. The catchment is now fully developed and the remnants of Le Roy’s pipe network still remain within the upper main channel forming a restriction to flows. During the late 1950s and early 1960s the estuary in the lower catchment was reclaimed allowing a freshwater wetland to form. The stream otherwise still largely retains its natural morphology.

Length		3.8km
Size of Catchment		97ha
Vegetation Cover		40% (39 ha), generally associated with the stream network.
Imperviousness		30%
District Plan Land Use	Business	7%
	Recreation	22%
	Residential	59%
	Road	12%
Recreational Use		High, known high public use of the stream locality.
Receiving Environment		Little Shoal Bay, Waitemata Harbour.
Substrate		Silt/mud throughout the lower reaches, bedrock in the most of the upper tributaries.
Natural Wetlands		Nil.
Artificial Wetlands		1
Periphyton		Below nuisance levels.
Macrophytes		Possible management issues in Tributary 1.
Macroinvertebrates		High species richness and MCI score.
Fish		4 species of native fish
Potential Man-Made Barriers to Fish Passage to Upstream Habitat		3
Channel Modification		Modified wetland in the lower main channel and old broken stormwater pipes in the upper main channel.
Erosion Around Structures		4 structures with severe erosion, 3 with moderate erosion, and 1 with slight erosion.
Bank Erosion		Slight throughout main channel, severe erosion in Tributary 2, and minor to moderate erosion in Tributaries 4, 5, 5A and 6.
Temperature		One measurement indicating no adverse effect on ecology, however summer temperatures are likely to be higher.
Suspended Solids, Turbidity And Visual Clarity		3 clarity measurements, high in wetland + below average clarity for North Shore streams in Tributary 2 and the main channel.
Oxygen and Oxygen Demand		Depressed oxygen concentrations in the upper and lower stream.
Nutrients		No data.
Contaminants		No data.
Bacteria and Pathogens		No data.
Sediment Quality		No data.
Debris		Nil other than old channel pipes.
Stream Grouping	Group 2, High value low disturbance	52%
	Group 3a, Urban semi-modified	42%
	Group 3b, Urban modified	-
	Group 4, Concrete lined channel	2%
	Group 5, Piped section	2%

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