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Design Example: Design of an Irrigation Channel01:27

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Linear infrastructure impacts on landscape hydrology.

Keren G Raiter1, Suzanne M Prober2, Hugh P Possingham3

  • 1School of Biological Sciences, University of Western Australia, 35 Stirling Hwy, Crawley, Perth, WA, 6009, Australia; CSIRO Land and Water, Private Bag 5, Wembley, Perth, WA, 6913, Australia.

Journal of Environmental Management
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Summary
This summary is machine-generated.

Roads and infrastructure significantly alter water flow and increase erosion in arid landscapes. This study quantizes these impacts, revealing widespread hydrological changes and soil degradation across Australia

Keywords:
Great Western WoodlandsRoad ecologyRoad impactsSemi-aridSoil erosionSurface hydrology

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Area of Science:

  • Environmental Science
  • Hydrology
  • Ecology

Background:

  • Linear infrastructure, such as roads and railways, is expanding globally.
  • Impacts on hydrological functions and soil processes are poorly understood, especially in arid regions.
  • Previous studies have identified potential impacts but rarely quantified them regionally.

Purpose of the Study:

  • To assess the regional effects of extensive track, road, and rail networks on surface hydrology.
  • To quantify impacts on ephemeral stream crossings in Australia's Great Western Woodlands.
  • To identify factors influencing the frequency and severity of hydrological alterations.

Main Methods:

  • Assessed over 1000 km of linear infrastructure and 300 ephemeral stream crossings.
  • Quantified erosion and pooling features on-road versus off-road.
  • Analyzed impacts on water movement at stream crossings, including flow impedance and diversion.

Main Results:

  • Linear infrastructure was strongly associated with altered surface hydrology; erosion and pooling were 5-6 times more likely on-road.
  • 98% of ephemeral stream crossings showed impacts on water movement (e.g., flow diversion, concentration).
  • Infrastructure type, land use, rainfall, soil properties, and topography influenced impact severity.

Conclusions:

  • Linear infrastructure frequently alters ephemeral stream flows and overland/near-surface flows, creating unnatural moisture regimes.
  • Infrastructure exacerbates erosion, leading to soil loss and degradation, with significant ecological consequences.
  • Protecting low-infrastructure areas and mitigating existing/planned developments are crucial for conservation.