Orewa Catchment Management Plan

The catchment study area covers approximately the eastern half of the principal Orewa River East Catchment Area. Currently almost the entire catchment study area is utilised for medium density residential use, with a large central business and commercial area.

Additionally, there is future development planned within the area for high density residential use. Historically the catchment has suffered from flooding problems related to the relatively flat topography, and it is this principle issue, which the Rodney District Council (RDC) wishes to investigate and address.

The Purpose of this Plan

To develop an integrated management approach to stormwater in Orewa.

This plan outlines and incorporates the key issues and catchment objectives developed with RDC. The report also assesses the effects on the environment of stormwater discharges, details stormwater treatment/flow, suitability of identified devices and strategies, flood control options and cost estimates.

In order to protect and enhance the identified sensitive receiving environments, there is a need to develop a set of guidelines with respect to the management of stormwater in the catchment. Several studies and previous reports have been undertaken in the area, and this ICNMP serves to bring this work together under a common management perspective. RDC also wishes to encourage the use of low-impact stormwater management practices where practicable, and the Orewa CBD catchment presents an opportunity to incorporate these principles to best service the present and indeed future community.

 

Draft Orewa Central Business District Study Area Integrated Catchment and Network Management Plan    (1084k)
Figure 2-3: Catchment Location	(180k)
Figure 2-4: Stormwater Catchments, Subcatchments and Receiving Environments	(288k)
Figure 2-5: Stormwater Services (Sheet 1)  Figure 2-5: Stormwater Services (Sheet 2)	(171k)   (267k)
Figure 2-7 Coastal Protection Areas Adjacent to Catchment	(189k)
Figure 2-8: Study Area Contour Elevation Plan	(662k)
Figure 2-9: Land Use Zones and Policy Areas (Current and Future)	(220k)
Figure 2-10: Proposed Future Development Scenario: Option 1 (Status Quo) – Suburban CBD	(243k)
Figure 2-11: Proposed Future Development Scenario: Option 2 – Coastal Urban Village CBD	(245k)
Figure 2-12: Proposed Future Development Scenario: Option 3 – Coastal Urban CBD	(245k)
Figure 2-13: Wastewater Services	(329k)
Figure 2-14: Water Supply Services	(290k)
Figure 2-15: Existing Stormwater Treatment Devices Locations	(250k)
Figure 2-16: Stormwater Treatment Devices– Existing and Proposed Locations	(251k)
Figure 3-4: Flooding Questionnaire Responses	(1604k)
Figure 3-5: 2-D Flood Relief Map (100 Year-24 hour – 2.3m Tide Level)	(263k)
Figure 3-6: Contaminant Loading Subcatchments	(274k)
Figure 3-7: Contaminant Loading (Copper)	(246k)
Figure 3-8: Contaminant Loading (Zinc)	(254k)
Figure 3-9: Contaminant Loading (Total Suspended Solids)	(245k)

Appendices

Please note: Appendix A (Model Details/Report), Appendix B (Stormwater Flooding Mitigation Measures – Figures), Appendix F (Environmental Reports) and Appendix G (Stormwater Projects Proposed) are too large to be published online.

Hard copies of these appendices are available for viewing at the Orewa Library or please contact us if you would like to purchase these on CD.

Appendix C: Stormwater Flooding Mitigation Measures – Cost Estimates Part 1	(914k)
Appendix C: Stormwater Flooding Mitigation Measures – Cost Estimates Part 2	(1046K)
Appendix D: Stormwater Evaluation Matrix	(73k)
Appendix E:  Sea Level Inundation Details	(1769k)

Further information

Related Documentation

Related Links

Orewa Stormwater and Coastal Outfalls