TGPC: Greater Wellington letter to Chair, PCTG BOI - Attachment 2

Literature review of Porirua Harbour and catchmentAppendix 2: Annotated BibliographyIsQG 'low'. Suggests identifying if catchment is still a significant source of DDT or ifinputs are historical and declining over time. Extensive appendix of data.Estuary hydrodynamics andsedimentationBerwick, D. (1978). Hyd, .dunc 1710del stwdres of Pawaiohonui Inlet. In: 'Predictions of physicalchanges caused by reclamation and dredging", Ministry of Works and Development, CentralLaboratories Report No. 3-7715In 1975 the National Water and Soil Conservation Organisation and the National RoadsBoard recommended construction of a hydraulic model of Pauatahanuilnlet. The modelwas built at the Ministry of Works and Development and extensive tests carried outduring 1977.Gibb, J. G. and G. I. Cox (2009). Patterns and rates of sedimentation within POTirua Harbour.Coastal Management Ltd Consultancy Report(CR2009/I) for POTirua City CouncilStudy of the pattern and rate of sedimentation on the POTirua Harbour seafloor over thelast 160 years, based on a comparison of hydrographic surveys made between 1849 and2009 (detailed analysis of sedimentation rates mainly uses the surveys of 1974 and 2009).Both arms of the Harbour have been a relatively stable geomorphic environment over thelast 7,300 years or more. They have progressiveIy shallowed from deposition of mud andsand at a net average rate of 1.0-1.5 mintyr. Innlling has progressed in the context of arecently rising global sea-level of 1.95 mintyr. Since forest clearance and landdevelopment began, rates of sedimentation have progressiveIy increased. Between 1974and 2009, they increased to 5.7 min/yr in the Onepoto Arm and 9.1 mintyr in thePauatahanui Inlet. The tidal prism has been reduced by 1.7% and 8.7% respectivelyduring that time. At current deposition rates Pauatahanui Inlet will have ceased to existas an estuary within 145-195 years and Onepoto Arm within 290-390 yearsGrange, K. R. and P. Luckens (1988). T/Ie marine envi, 'on ritent 11nder Ihejurisdrctioit of PonyiiuHUI'hour Awn?only. NZ Oceanographic Institute, Division of Marine and Freshwater Science,DSl"^..Summarises the existing information concerning the types of marine habitats, sedimentcomposition and dynamics of the POTirua Harbour and adjacent open coast under thejurisdiction of the POTirua City CouncilHayward and Triggs (1994), in Bellingham (1998).Includes map of sediment types in Pauatahanui Inlet, reproduced in Bellingham (1998,pp5.21), but further bibliographic details not givenHeath, R. A. (1976). Broad classification of New Zealand inlets with emphasis on residencetimes. New Zealoiid Journal of Marine and Freshwo!erReseurc/I 10(3): 677-687Classification of 32 inlets in New Zealand into 7 groups. Pauatahanuilnlet grouped as'predominantly tidal flow' as the entrance is controlled by tidal movements. Fresh waterinflows from each tributary into POTirua Harbour presentedHeath, R. A. (1977). Heal balance in a small coastal inlet Pauatahanuilnlet, North Island, NewZealand. Estuurine und CousinlMni. me Science 5(6): 783-792Report for Porirua City Council & Wellington City CouncilBlaschke and Rutherford Environmental ConsultantsFebruary 201038