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Difficulty: MediumUrbanization and Urban Settlement Problems

A persistent urban environmental problem in many rapidly expanding cities of developing nations is the recurring occurrence of artificial flash flooding during rainy seasons. Which of the following urban human activities is the primary geographical cause of this hazard?

  1. The encroachment of informal settlements and uncollected solid municipal waste onto natural drainage channels and floodplains.Answer
  2. B
    The rapid provision of subsidized rural infrastructure acting as a push factor that drives urban residents to relocate into river valleys.
  3. C
    The spatial transformation of central commercial districts into isolated linear settlements along rural arterial highways.
  4. D
    A sharp rise in the urban dependency ratio caused by the massive outflow of young working-age adults to agricultural regions.

Answer

The primary geographical cause of artificial urban flash flooding is the encroachment of informal settlements and uncollected solid municipal waste onto natural drainage channels and floodplains.
Rapid, unplanned urbanization in developing nations outpaces municipal infrastructural capacity. As a result, low-income urban dwellers often build informal squatter structures on cheap, flood-prone lands such as natural river channels and wetlands. Combined with poor municipal waste management, refuse is dumped into drainage conduits, clogging storm sewers and causing floodwaters to overflow during heavy rainfall.

Step-by-Step Solution

1
Analyze the core urban problem described in the stem.
The issue is artificial urban flash flooding caused by human environmental interactions in rapidly growing cities.
Rapid urban growth outpaces municipal planning, resulting in infrastructure deficits.
2
Evaluate the land-use and environmental impacts of informal settlement growth.
High land values and housing shortages force low-income migrants onto ecologically sensitive, low-lying floodplains and canal banks.
Building over natural waterways and dumping untreated solid waste physically blocks stormwater channels, severely reducing runoff velocity and volume capacity.
3
Identify the correct option corresponding to drainage channel obstruction.
The option specifying informal settlement encroachment and solid waste accumulation directly explains drainage failure and flood recurrence.
This represents the direct human-environment cause of urban flooding in developing cities.

Key Concept

Urban Settlement Problems and Infrastructure Deficits
Estimated Time:1m 0s
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Topics

Urbanization and Urban Settlement Problems

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