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Keith Calder, 21 October 2009Keith Calder, 21 October 2009
PoriruaPorirua HarbourHarbour CatchmentCatchment
Land Use ChangesLand Use Changes
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Time lineTime line
Source: Chris Hollis, GNS
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Wellington RegionWellington RegionHistoricHistoric IndigenousIndigenous Vegetation Loss 1Vegetation Loss 1
PrePre--HumanHuman
Source: Geographx NZ Ltd
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Wellington RegionWellington RegionHistoricHistoric IndigenousIndigenous Vegetation Loss 2Vegetation Loss 2
18401840
Source: Geographx NZ Ltd
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Wellington RegionWellington RegionHistoricHistoric IndigenousIndigenous Vegetation Loss 3Vegetation Loss 3
Source: Geographx NZ Ltd
PresentPresent
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Wellington RegionWellington RegionPresent Land CoverPresent Land Cover
Source: NZ Land Cover Data Map
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Wellington RegionWellington Region
CurrentCurrent CatchmentCatchment Forest CoverForest Cover
Source: GWRC
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Porirua Map 1846Porirua Map 1846
Source: www.matapihi.org.nz
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Porirua Bay 1920Porirua Bay 1920--19251925
William George BakerWilliam George Baker
Source: www.matapihi.org.nz
[Porirua Harbour]
surrounded withlow wooded hills forseveral miles.
1850. Godley
(1936)
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Source: www.mataphi.org.nz)
This is the worst country I eversaw for field operations. Theforest is so thick as to be
almost impenetrable. It iseverywhere a mass ofevergreen trees and shrubs
matted and twined togetherwith supplejack creepers andwild vines.Tyrone Power 1849
New Zealand forest near Porirua 1847.New Zealand forest near Porirua 1847.
GeorgeGeorge AngasAngas
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Porirua Road 1853Porirua Road 1853watercolourwatercolour by Ltby Lt--Col. W.A.Col. W.A. McClevertyMcCleverty
Two sketches byColonel
W.A.McCleverty ofPorirua Road 1853and Horokiwi Valleyin 1854 show thick
bush cover of rimu,tawa, rewarewa,nikau and treefern.Healy 1980
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Original subdivisionOriginal subdivision
New Zealand Company map of first settlements 1842
Porirua Village layout 1841
Source: Healy (1980)
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MillingMilling
Hurley & Carter
sawmill 1863.John Bradey 1926
Kaiwharawhara Mill 1843.S. C. Brees.
Source: www.matapihi.org.nz
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ChangeChange
Pauatahanui catchment(Healy 1980)
Mid 1800s - two-thirds still in native forest.
By 2000 - two thirds was grassland.
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Urban DevelopmentUrban Development
Source: www.matapihi.org.nz
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EarlyEarly WhitbyWhitby DevelopmentDevelopment
Source: Chris Hollis, GNS
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Land Use 1941Land Use 1941--4242
Source: Chris Hollis, GNS
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Land Use 1973Land Use 1973--7474
Source: Chris Hollis, GNS
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Land Use 2000Land Use 2000
Source: Chris Hollis, GNS
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Trends from 1942 to 2000Trends from 1942 to 2000
Source: Chris Hollis, GNS
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Rural erosionRural erosion
Source: Chris Hollis, GNS
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Urban earthworks & siltUrban earthworks & silt
Whitby & Browns Bay 1970s Source: Chris Hollis, GNS
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StormwaterStormwater
Photos: K Calder
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Nutrient enrichmentNutrient enrichment
Photo: K. Calder
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LitterLitter
Photo: K. Calder
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CamborneCamborne
PukeruaPukerua BayBay
Duck Creek/Duck Creek/
SilverwoodSilverwoodAoteaAotea
BlockBlockPorirua HospitalPorirua Hospital
ChurtonChurton ParkParkNorthNorth
LincolnshireLincolnshire
FarmFarm
NewlandsNewlands
FUTUREFUTURE
PORIRUA BASINPORIRUA BASIN
DEVELOPMENTSDEVELOPMENTS
Transmission Gully Motorway
Future Urban Development
Rural Development
Forestry Harvesting
Wind Farm Development
Catchment Boundaries
Local Authority Boundaries
Major Roads
Main Trunk Railway
100% of Wellington Citysgreenfield development
50% of Wellington regions
urban growth
Urban subdivision
Rural/residential intensificationRoading
Windfarms
Forest harvesting
Potential FuturePotential Future
DevelopmentsDevelopments
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FutureFuture catchmentcatchment issuesissues
Climate change and sea-level rise
Further urbanisation & roading