growing pains - the auckland capacity for growth study

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Michael Oberdries Growing Pains: The Auckland City ‘Capacity for Growth Study’

The Auckland Region

!  Encompasses the Auckland metropolitan area, smaller towns, rural areas, and the islands of the Hauraki Gulf

!  Population of 1.5 million

!  Is home to 1/3 of all New Zealand’s residents

So what is the Capacity for Growth Study (CfGS) ?

!  The CfGS is a way to measure the capacity a region has for accommodating residential and business growth under an operative (or proposed) planning rule book?

!  The CfGS is a census of plan-enabled capacity.

The Strategic Context …

!  A 30 year vision;

!  For 1 million more people;

!  For 400,000 more dwellings;

!  Understanding WHEN, WHERE and HOW growth may occur?

The Operational Context …

!  The restructuring of Local Government in Auckland …

!  Combining the functions of a regional council and 7 city and district councils into an Auckland “Super City”

!  Transitioning from 4 regional plans + 7 district plans to a single Auckland Unitary Plan

The Political Context …

But the biggest challenge of all ...

So what does the CfGS deliver?

Questions Segmentations !  Residential !  Business Commercial !  Business Industrial !  Rural Residential

Assessments !  Vacant land !  Redevelopment

potential !  Infill capacity

potential !  Vacant potential

Data Parcels

Rates assessments Titles

Building footprints Zoning

District plan provisions Environmental data

Infrastructure/services Floor space data

Employee counts Dwelling counts

Capacity Model

From a Workflow Schematic …

To FME Modelling Algorithms …

To Configurable Parameters …

Staged Implementation

Pilot Area

Legacy District

Supercity Region

INFILL is easy to detect visually …

INFILL is easy to conceptualise...

Residential parcel

Building footprint

District plan set backs

Geo-processing to calculate vacant portion of parcel

Geo-processing to check for vehicle access to the street

Calculate capacity Yield (dwellings)

Yield =

x additional

dwellings

But INFILL is difficult to computerize …

STEP 1 : Triangulate the vacant space on target parcels qualified by model constraints …

STEP 2 : Filter triangle candidates by AREA and SHAPE rankings …

STEP 3 : Replace triangle-geometry with circles to extend coverage on the vacant part of the parcel …

Every triangle has a circumscribed circle …

STEP 4 : Identify where the circle-geometry intersects the parcel polygon (exclusive of the building footprint) …

STEP 5 : Replace the circle-overlays with their b-box to extend coverage on the vacant part of the parcel …

STEP 6 : Identify where b-box geometry intersects the parcel polygon …

STEP 7 : Buffer building footprints and drop the INFILL candidates that exceed the zone min-area constraints …

STEP 8 : Qualify the INFILL candidates for building platform shape and test for road frontage access …

Back to the “real world” …

Business Capacity Modelling …

!  Business capacity is constrained in 3 dimensions which means volumetric modelling

Consider a Business Zone and its neighbouring zones

Neighbouring zones affect business capacity : recession planes | yard setbacks | upper level road setbacks

STEP 1 : Extrude business parcels to their maximum allowable storeys

STEP 2 : Remove storeys within encroaching affectations to create the maximum permitted building envelope

STEP 3 : The potential for development is the difference between modelled and existing floor-space

STEP 4 : Illustrate various new development scenarios within maximum complying building envelope

FME generated GeoPDF Newmarket business area WITH (left) and WITHOUT (right) volcanic view-shaft height controls

Scenario Modelling …

Current Zoning Net Redevelopment Yield = 1065 new dwelling candidates

Test Zoning Net Redevelopment Yield = 2743 new dwelling candidates

Benefits from the CfGS

More informed decision making … !  Time and resource savings

!  Project duration: 12 months, compared to 4 years !  Data modelling repeatability

!  1 to 2 days to run all models to completion !  Configurable “What if?” scenario modelling !  Improved information for stakeholders !  A data driven, evidence based approach

!  Independent of the political pressures around outcomes !  Creation of data framework for additional research …

Thank You!

!  Questions?

!  For more information: !  michael@oberdries.com !  Oberdries Consulting Ltd

!  http://www.aucklandcouncil.govt.nz/EN/planspoliciesprojects/reports/technicalpublications/Pages/capacityforgrowthstudy.aspx

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