Urban Growth Patterns and Planning Fundamentals
Drivers of Urban Change and Marchetti's Constant
- Marchetti's Constant: A theory stating that most daily commutes average about one hour, with people typically prepared to travel 30 to 40 minutes each way to work. This influences urban form and house-buying decisions.
- Cities as Economic Engines: Urban environments act as hubs for concentration of resources, economies of scale, innovation, and global connectivity.
- Technological Shifts: Rapid changes in transportation technology, such as the transition from horse-drawn carriages to automobiles in New York between 1902 and 1913, significantly reconfigure cities.
Urban Growth Models
- Burgess Model: A theory based on Chicago’s growth, focusing on concentric spatial arrangements and settlement patterns.
- Hoyt’s Sector Model: Suggests cities develop in sectors rather than rings, heavily influenced by residential rent patterns and transport linkages.
- Harris-Ullman (Multiple Nuclei) Model: Assumes Central Business Districts (CBDs) are losing dominance. It considers uneven topology and the high mobility provided by car ownership.
Urban Planning and Policy in Victoria
- Planning Definition: The process of balancing individual interests with societal common interests regarding land use and environmental impacts.
- Strategic Planning: Involves preparing long-term plans (e.g., Plan Melbourne 2017-2050) and policies at regional and metropolitan scales. A current goal is the "20-minute neighborhood."
- Statutory Planning: The regulatory regime involving Zones and Overlays that provide formal status to policies through the Planning Scheme.
- Victorian Planning System: Governed by the Planning and Environment Act 1987, which aims for the fair, orderly, and sustainable use of land.
- Permit Differences:
- Planning Permit: Relates to the USE of the land.
- Building Permit: Relates to the CONSTRUCTION aspects (Building Regulations).
Urban Sprawl and Density Comparisons (2023 Data)
- Melbourne, Australia: Built-up area of approximately 2,453km2 for a population of 5,151,000.
- Cape Town, South Africa: Built-up area of approximately 400km2 for a population of 4,800,000.
- Jeddah, Saudi Arabia: Built-up area of approximately 1,600km2 for a population of 4,697,000.
Questions & Discussion
- Transition Observation: Looking at the shift from horses to cars, what potential issues can be identified (e.g., infrastructure lag, safety)?
- Gentrification: What are the positive and negative effects of higher-income residents moving into lower-income neighborhoods?
- Historical Context: What was located at the Southbank site prior to its development in the 1990s, and why did the government choose to develop it?
- Future Cities: Brainstorm how cities will look in 45 years regarding technology, energy, social equity, and the survival of "work from home" patterns.
- Bad Planning Outcomes: Identify characteristics of poor planning, such as urban sprawl, congestion, and lack of affordable housing.
- VicPlan Activity: Use the VicPlan tool to search a property address, identify its zoning/overlays, and measure its boundaries.