Papakura Catchment background details
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| Information | Details | Reference 1 | Reference 2 |
|---|---|---|---|
| Catchment Group | Papakura Catchment | ||
| Location | Located in South Auckland and corsses the boundary between Manukau City and Papakura District | ||
| Total catchment area | 56km2 | ||
| CCDC | - | ||
| ARC reference | - | ||
| Sub Catchments | The catchment can be divided into three areas referred
to as the Upper, Middle and Lower Catchments. Upper Catchment - Brookby Valley. Middle Catchment - Alfriston/Ardomore Valley. Lower Catchment - Manurewa/Takanini Valley. |
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| Annual Rainfall | The Albert Park Guage has been adopted as representative of the rainfall in the Pakura catchment. Statistics are represented in table 6.1. | Table 6.1 | |
| Annual Discharge | - | ||
| Slope Range | - |
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| Main Channel Length | - | ||
| Primary System LOS | - | ||
| Open Water Courses Length | - | ||
| Geology/Soil | The Papakura Stream through the Middle
and Lower Catchments forms a natural divide between the
steeper terrain (underlain by sloping Waitemata soils)
to the north and the near flat ground (underlain by peaty,
Pleistocene deposits) to the south. The Papakura Stream itself lies within the Waitemata group soils where exposed sandstone beds can be seen in the stream. The Papakura Stream catchment originates in an upthrown block of very well indurated sandstone and mudstone. The stream then flows through the Waiheke Group on the downthrown side of the WAikopua Fault and on to the aggraded alluvial plain of Papakura - Takanini. To the north of Papakura Stream is Waitemata formation sandstone. The Papakura Stream is located at the boundary of Waitemata Group and alluvium. The alluvium comprises light grey to red brown, soft to very stiff clays, silts and sands. Alluvium is covered by peat in the southern part of the Lower and Middle catchments. |
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| Land Use | Primarily rural. The lower catchment from the outlet
to Porchester Road is developed. Much of the area is residential.
However, industries have been established particularly
around the Lower Holmes Road area, between the railway
line and the Great South Road and on the left bank between
Porchester Road and the motorway. The Papakura Catchment currently lies in the local territories of the Manukau City and Papakura District. The Boundary between these Local Authorities follows the Papakura Stream from the Outlet to Porchester Road, then north along Porchester Road, east along Ranfurly Road and south along Aflriston Ardmore Road. The main stream can be divided into three zones on the basis of Local Authority boundaries: |
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| Zone 1 | From the outlet at Manukau Harbour to Porchester Road where the left bank lies in Papakura District and the right bank lies in Manukau City. | ||
| Zone 2 | From Porchester Road to Alfriston / Ardmore Road (Muirs Bridge) the main channel lies in Papkura District and | ||
| Zone 3 | From Alfriston / Ardomore Road (Muirs Bridge) upstream to the top of the catchment the main channel lies in Manukau City. | ||
| Water Quality | Quality of stormwater in the Papakura stream not analysed for this study. Specific pollutants or potential pollutants in the catchment have been identified. | ||
| NPS | - | ||
| PS | - | ||
| Flood Hazard | Historical flooding has occurred primarily around Mill Road and between the motorway and the outlet. | Table 5.1 |