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

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,.Literature review of Porirua Harbour and catchmentAppendix 2: Annotated BibliographyAnon (no date-b). Ponyua Sired11/1/00d Initi^ajio, I proposals. Pubfic submissions received onenvironmenioli!lipact assessiiieni, unpublished documents. (Folder of collected submissions, heldat GWRC library).Ninety two public submissions received during the Environmental Impact Assessmentprocess (Anon 1989) of the proposed flood mitigation proposalsBeca (1993). Ponyuu Styeqni channeliniprovei?tents. Beca Carter Honings and Ferner Ltd. forWellington Regional CouncilDesign of proposed flood projections. Economic and environmental aspects discussedConsiderations off100d velocities, hydraulics and scour. Design plans as appendix.Beca (2003). Duck Creek SIorinwoter Modelling. Beca Carter Honings and Ferner Ltd. preparedfor POTirua City Council.Survey of bed, banks and potentially flood prone land of Duck Creek, through WhitbyGolf Course. Hydraulic modelling of Duck Creek catchment for I year, mean annual, 10year and 50 year flood events. These return floods estimated under different urbanisationscenarios.Connell Wagner (no date). Pawaiohun!It Siren, ,I Modelling Repori. Aimchi, teni I. Report 06.257for POTirua City CouncilA hydrological and hydraulic model of Pauatahanui Stream in relation to floodingpotential. Report was initiated after floods and public complaints. 5.5km of stream weremodelled and 10 and 100 year flooding contours were estimated and mapped. Recentdevelopments that have affected the capacity and risk of flooding include: SH58realignment works in 1994 and 2002; deposition of gravels in the upper catchment; stopback at the sawmill(which have decreased cross sectional area) and uncontrolled growthof vegetation along the stream. Gravels are sourced from earthworks upstream atMoonshine Rd where forestry work and track cutting have led to deposits of gravelaccumulating in the stream and raising the bed level. To lessen flood risk, the reportrecommends: removal or pruning of vegetation especially between Flightys Rd bridgeand Belmont Rd bridge; remove gravel in upper reaches and provide detention areas.These options may possibly increase downstream flooding so options need to beassessedCurry, R. (1981). Hydrology o1/11e calch}?leitis draining to Ihe POWatuhunwi Inlet. Water and SoilTechnical Publication 23. Ministry of Works DevelopmentFreshwater inflows and sediment yields evaluated for 6 main sub-catchments. Floodsconfirmed as major contributor of sediment variation in annualsedimeni yields. Lowestconcentration recorded in Ration Stream (5 - 520mg/L) and highest in Browns Stream(25 - 1500mg/L) downstream of sill pond. Suspended material in Browns catchment fine(>75% clay) settled before tidal flushing could remove suspended particles because oflow energy now from Browns Stream. Sediment rating changed since study with moresurfaces sealed or in vegetationCWRH (1991). Ponyuu food Initigoiion SIMdy. Cosi beHelli analysis oldeveloping SIebbiiigsdalli. Connell, Wagner, Rahine and Hill, report for Wellington Regional Council N' WRC/Rl-T-92138Compares cost of developmentenvironmental assessment.versus cost of payouts for flood events. NoReportfor Porirua City Council & Wellington City CouncilBlaschke and Rutherford Environmental ConsultantsFebruary 20.012
,Literature review of Porirua Harbour and catchmentAppendix 2: Annotated BibliographyCWRH (1992). Ponyua SiredinI. Cosi bend'i! analysis of upginding sirenin reaches. Firsirevision. Connell, Wagner, Rahine and Hill, report for Wellington Regional Council N' WRCR. I-T-92139.Cost benefit analysis of channel upgrades in discreet sections, in regards to constructionand damages costEyles, I. (2006). Pulla!ahonui Sirednt flood lidzord invesiigaiion. Greater Welling10n RegionalCouncil, Report 06.257Briefing on the findings of the Pauatahanui Stream flood hazard investigation (Anon, nodate). Flooding of the sawmill property will occur in 100 year event, SH58 will beovertopped in two places in a 10 year event, and flooding will impact Judgeford GolfCourse. Outlines factors influencing increased flooding risk.GWRC (2004a, 9/2/2009). Horokiri Sired1,101Sitodgruss. Greater Wellington Regional Councilenvironmental 10nlinGl Retrieved 10/02/2009, frommonitoring reporthitp://WWW. gw. govt. nz/story24643. cfm?Website showing flow rate (in'/s) of HOTokiri Stream. Data available from 2002 topresent date (updated daily). Site has been monitored since 2002. Annualstatisiics(2002 10 present) on maximum, minimum and mean flow ratesGWRC. (2004b, 9/2/2009). Porirttu Sired111 o1 Town Cenire" Greater Wellington RegionalCouncil environmental monitoring report [online]. Reineved: 10/02/2009, fromhttp://WWW. gw. govt. nz/story902. cfm?Website showing flow rate (in'/s) of POTirua Stream. Data available from 2000 to presentdate (updated daily). Site has been monitored since 1965. Statistics on low now returnperiods and flood return periods. Annual statistics (2000 to present) on maximum,minimum and mean now ratesGWRC. (2004c, 9/2/2009). Tulipo Siredni at Flux Swanip. Greater Wellington Regional Councilenvironmental monitoring report 10nlinel. Retrieved 10/02/2009, from:http://WWW. gw. govt. nz/story904. cfm?Website showing now rate (in'/s) of Taupo Stream. Data available from 2000 to presentdate (updated daily). Site has been monitored since 1976. Statistics on low flow returnperiods.Jowett, I. G. and M. I. Duncan (1990). Flow vanability in New Zealand rivers and its relationshipto in-steam habitat and biola. New Zealand Journal of Marine and Freshwuier Reseurc/? 24: 305-317.130 New Zealand rivers were analysed for flow vanability indices. Catchmenicharacteristics (such as percentage forest, slope, permeability) that contributed 10 nowvanability were determined and quantified. Water velocity was linked to changes inwater temperature, benthic invertebrate and penphyton community structure and troutdistribution and abundance. Pauatahanui Stream has greater now vanability than POTiruaStream.Martell, C. (1996). TITe ayeci o110/1d-use change o111he exient o1/100ding ill Ihe Ponyuu BasinUnpublished Msc thesis, Victoria University, Wellington.The deforestation and subsequent urbanisation of a catchment has dramatic impacts on itshydrological response to storm events. Analysis of the hydrometric records for thePorirua Stream catchment indicated that urban growth was impacting on catchmentReport for Porirua City Council & Wellington City CouncilBlaschke and Rutherford Environmental ConsultantsFebruary 201013
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TGPC: Greater Wellington letter to Chair, PCTG BOI - Attachment 2

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