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Working for wetlands
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SANBI Working for Wetlands
•Nationwideprogrammetorehabilitatewetlands
•StartedinWorkingforWaterasalienclearing
•AnnualbudgetofA$9.7million
•UsesSMMEprinciples
•Restore+100wetlands/year
•Creates+2100jobs/year
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Project overview•ClientisSouthAfricanNationalBiodiversityInstitute(SANBI)
•Professionalfees:A$2.4million
•3yearappointment
•Aureconinvolvedcountrywide(severalofficesthroughoutSouthAfrica)
•Wetlandecologistssub-consulttoAurecon
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Typical problems in wetlands
•Headcuterosion
•Artificialdrains
•Incisedchannels
•Excessivesediment
•Man-madediversions
•Alieninvasion
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Why rehabilitate wetlands?
•Restoreitsnaturalfunctioning
•Re-hydratebyliftingthewatertable
•Increasewaterstorage
•Improvewaterquality
•Increasebiodiversity
•Aesthetics&tourism
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Aurecon’s role
•Consultingandplanningservices.
•Engineeringdesignof±400structuresperyear.
•Coordinatedlargeteamconsistingof -Environmentalpractitioners -Engineers -WetlandEcologists -SANBIProvincialCoordinators
•Complywithlegislationandobtainenvironmentalandwateruseauthorisations
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Design principles
•Visualdeterminationofannualfloodlevels
•Hydraulicdesignfordrownedstructuresusingsimpleweircalculations
•Standardisedstructuraldesigns
•Component-basedconcreteweirs
-Bookofstandarddetailsforeachcomponent ofaweir
-Eachdetailisforadifferentsizeofcomponent
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Tsitsikama
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Risk
•Highriskbutlowcostoffailure(nodamageincurredbyfailures)
•Projectgearedtowardsrepairingfailedstructures
•Inexperiencedcontractors
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Before and after
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Before
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After
ContactAndré GörgensWaterResourcesManagementLeader,[email protected]
