ipwea sustainability in public works conference - august 2016
TRANSCRIPT
What works well with communities to keep
communities working well?
A Howe, S Pope, A Stewart, T Boyle & G GilesSustainability in Public Works Conference
24-26 August 2016
Presentation Overview
1. Background to adaptation planning in Lake Macquarie City
2. Flooding and inundation issues in our first adaptation planning area
3. Our approach to developing the plan
4. Key lessons learned
Key economic statistics
Residential buildings at risk of inundation
Source: Department of Climate Change, 2009
Aerial photo
Belmont
Swansea
Belmont South
Marks Point
Lake flooding at Marks Point
June 19491.25m AHD
Feb 19901.00m AHD
June 20071.05m AHD
1. How to manage and coordinate the progressive raising of land, roads, drains and other infrastructure?
2. How to finance the extra costs in renewing infrastructure and who should pay?
3. How to support new development without adding to the risk from the increasing hazard?
Key adaptation planning questions
Are the environmental
effects manageable?
Will it work to reduce the risk from
flooding and inundation?
Will it help maintain
community lifestyle?
Do the benefits
outweigh the costs?
Questions considered in context of four key criteria
Solutions developed through comprehensive community engagement
Asset Class Asset Category
Proposed Asset Life
(years)
Design Flood Recurrence
Interval
Rise in Sea Level
(metres)
Roads, Cycleways & Footpaths
Bridges
Stormwater Drainage
Civic Buildings & Amenities
Other Land Uses
Foreshore Protection
Design standards for future assets
Asset Class Asset Category Proposed Asset Life
Design Flood Recurrence Interval
Rise in Sea Level (m)
Roads, Cycleways & Footpaths
Major roads 50 1:100 0.40 Minor roads 50 1:10 0.40 Cycleways 40 1:10 0.32Footpaths 40 1:10 0.32
Bridges Steel & concrete 50 1:100 0.40 Timber 20 1:100 0.16
Stormwater Drainage
Natural watercourses - - - Vegetated channels 30 1:10 0.24Lined channels 50 1:10 0.40 Inlet pits & pipes 50 1:10 0.40 Kerb & guttering 50 1:10 0.40
Civic Buildings & Amenities
Community halls 50 1:100 + 0.5m 0.40 Schools 100 1:100 + 0.5m 0.90Sports club buildings 50 1:100 + 0.5m 0.40 Amenities blocks 30 1:20 0.24Boat ramps 30 1:20 0.24Minor structures - - -
Other Land Uses
Golf courses 50 1:20 0.40Marinas 50 1:100 0.40Special uses e.g. airport Case by case
Foreshore Protection
Seawalls, groynes & revetments 50 1:20 0.40
‘Soft’ and temporary protection 30 1:20 0.24
1. Building trusting relationships is critical
2. Boundaries need to be clear and well scoped
3. Flexible but firm planning process is required
4. Establish clear objectives and performance criteria
5. Collaboration doesn’t stop with the plan
6. Improved understanding and ownership of plans will aid implementation
Key lessons learned
