| Information |
Details |
Reference 1 |
Reference 2 |
| Catchment
Group |
Upper catchment of Puhinui
Stream |
|
Map
1 |
| Location |
5KM south east of Manukau City Centre in Manurewa Ward. |
|
|
| Total catchment
area |
359 ha |
|
|
| CCDC |
- |
|
|
| ARC reference |
- |
|
|
| Sub Catchments |
CID-Storm City |
|
|
| Annual Rainfall |
Rainfall frequencies analysed were 50%AEP, 20% AEP,
1% AEP. Rainfall durations of 10 mins, 20 mins, 30 mins,
60 mins, 120 mins and 180 mins were used. Average rainfall
durations up to 60 minutes derived from MCC Standard Intensity
Duration Curve and for durations greater than 60 mins
were derived from HIRDS tables. Mean rainfall intensities
from MCC Standard Frequency Intensity Duration Curve and
HIRDS table were converted to temporal patterns of Auckland
city. |
Table1 |
|
| Annual Discharge |
- |
|
|
| Slope Range |
Entire area is sloping with average slopes ranging from
5-15% |
|
|
| Main Channel Length |
Upper reaches of Puhinui Stream form the
main drainage system of the area. Southwestern parts of
the area zoned as main residential have primary pipe stormwater
system. |
|
|
| Primary System LOS |
- |
|
|
| Open Water Courses Length |
- |
|
|
| Geology/Soil |
Colluvium or Alluvium overlaying alternating
layers Sandstone/Mudstone with interbeds.
|
|
|
| Land Use |
Residential |
Table
2 |
Table
3 |
| Public Open Space |
Table
2 |
Table
3 |
| Designated Area |
Table
2 |
Table
3 |
| Rural |
Table
2 |
Table
3 |
| Three land use zoning scenarios were analsysed
in an exercise. These scenarios represent: |
|
|
| Pre-Developed Conditions |
- |
Map 2 |
| Transition District Plan |
Table
4 |
Map 3 |
| Proposed District Plan |
Table
5 |
Map 4 |
| Water
Quality |
- |
|
|
| NPS |
- |
|
|
| PS |
- |
|
|
| Flood
Hazard |
Hill Road Sub-Catchments |
|
|
| Key are of interest in this study is the sub-catchments
off Hill Road. Summary of pre and post development flows
peaks from these sub-catchments are shown in tables 6
and 7. |
Table
6 |
Table
7 |
| Upper Puhinui Stream |
|
|
| Flows for Upper Puhinui Stream in Table
8 |
Table
8 |
|
