IPWEA NZ CONFERENCE 2018 ROTORUA
Rising Expectations - Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
Edwin Nixon Proudly sponsored by
Pattle Delamore Partners
IPWEA NZ CONFERENCE 2018 ROTORUA Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
IPWEAIPWEA NZNZ CONFERENCECONFERENCE 20182017 ROTORUADUNEDIN Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
IPWEAIPWEA NZNZ CONFERENCECONFERENCE 20182017 ROTORUADUNEDIN
NIWA, Auckland Region climate change projections and impacts: Summary Report, March 2016 Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
IPWEAIPWEA NZNZ CONFERENCECONFERENCE 20182017 ROTORUADUNEDIN Auckland International Airport: • New Zealand’s largest airport • 14.5 million passengers a year • Located within Manukau Harbour, South Auckland
http://www.stuff.co.nz/travel/9579363/Air-NZ-targets-Asia-with-new-Boeing-787. 5 April, 2018 Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
IPWEAIPWEA NZNZ CONFERENCECONFERENCE 20182017 ROTORUADUNEDIN
https://corporate.aucklandairport.co.nz/airport-of-the-future. 5 April, 2018 Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
IPWEAIPWEA NZNZ CONFERENCECONFERENCE 20182017 ROTORUADUNEDIN Sea Level Rise Extent • Existing runway is expected to suffer from inundation due to 0.5 m sea level rise. • Stormwater outfalls directly to harbour or via treatment ponds and wetlands, all of which are expected to be inundated by 0.5 m sea level rise. • What effect will this have on the Airport’s stormwater network?
NIWA, Coastal hazard and sea-level rise inundation exposure for Auckland Airport, March 2016 Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
IPWEAIPWEA NZNZ CONFERENCECONFERENCE 20182017 ROTORUADUNEDIN Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
IPWEAIPWEA NZNZ CONFERENCECONFERENCE 20182017 ROTORUADUNEDIN
Height to ground level
Water level increase due to 1 m sea level rise
Current 1% AEP modelled water level Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
IPWEAIPWEA NZNZ CONFERENCECONFERENCE 20182017 ROTORUADUNEDIN Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
IPWEAIPWEA NZNZ CONFERENCECONFERENCE 20182017 ROTORUADUNEDIN Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
IPWEAIPWEA NZNZ CONFERENCECONFERENCE 20182017 ROTORUADUNEDIN Stormwater Treatment Effects • Western Wetland and three ponds are already at risk of inundation. • Two remaining ponds will be inundated at 0.5 m sea level rise. • Reduced treatment performance as flows bypass treatment device. • Western Wetland will be particularly affected by increased salinity which will affect wetland vegetation with poor salt tolerance.
NIWA, Coastal hazard and sea-level rise inundation exposure for Auckland Airport, March 2016 Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
IPWEAIPWEA NZNZ CONFERENCECONFERENCE 20182017 ROTORUADUNEDIN
https://www.greaterauckland.org.nz/2017/07/27/airport-future-auckland-airport/. 6 April, 2018 Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
IPWEAIPWEA NZNZ CONFERENCECONFERENCE 20182017 ROTORUADUNEDIN Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
IPWEAIPWEA NZNZ CONFERENCECONFERENCE 20182017 ROTORUADUNEDIN Recommendations: • Confirm overland flow paths in the field to model flood levels more accurately. • Assess the effect of flood levels during sea level rise scenarios on the International and Domestic Terminal floor levels. • Implement risk management plans for flooding in key areas such as the drop-off zone at the international terminal. • Monitor water levels and saltwater intrusion at stormwater treatment devices. • Consider climate change (including wind effects) and sea level rise effects in the design of future stormwater systems. • Update 2D Flood Model to include climate change and sea level rise scenarios. Sea Level Rise Effects on the Stormwater Network at Auckland International Airport
IPWEAIPWEA NZNZ CONFERENCECONFERENCE 20182017 ROTORUADUNEDIN Thank You!
Special thanks to Roger Seyb and Josh Lotter