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 3030 to 4040 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 19021902 and 19131913, 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 "2020-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 2,453km22,453\,km^2 for a population of 5,151,0005,151,000.
  • Cape Town, South Africa: Built-up area of approximately 400km2400\,km^2 for a population of 4,800,0004,800,000.
  • Jeddah, Saudi Arabia: Built-up area of approximately 1,600km21,600\,km^2 for a population of 4,697,0004,697,000.

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 19901990s, and why did the government choose to develop it?
  • Future Cities: Brainstorm how cities will look in 4545 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.