The extent of roads and other forms of linear infrastructure is burgeoning worldwide, however there has been little quantification of how linear infrastructure affects the movement of water across landscapes. In our paper published in the Journal of Environmental Management, we present the first (to our knowledge) study to characterise and quantify the broad-scale impacts of linear infrastructure networks on surface and near-surface hydrology of a semi-arid region, Western Australia’s Great Western Woodlands.
With linear infrastructure named ‘one of the most pressing rangeland management concerns in arid and semi-arid lands globally’ (Duniway and Herrick 2013, in Rangeland Ecology and Management), we found that hydrological impacts of linear infrastructure are pervasive, but that there is considerable scope for addressing impacts. Hydrological impacts included erosion and pooling, as well as flow impedance, concentration and channelling, diversion, and new channel initiation at drainage crossings. Strategies for managing and mitigating these impacts include: hydrologically considerate infrastructure design; improving consideration of hydrological impacts in environmental impact evaluations, land-use or conservation plans, and mitigation strategies; developing risk maps to inform landscape-scale planning of linear infrastructure in relatively undisturbed landscapes; and further research to better understand the ecological ramifications of the impacts we report, and identify cost-effective solutions.
Our approach and methodology provide information and insights that are useful for cumulative and strategic impact assessment and decision-making as well as landscape planning and conservation policy, and can be applied to a range of other landscapes worldwide.
Ref: Raiter, K.G., Prober, S.M., Possingham, H.P., Westcott, F., Hobbs, R.J., 2018. Linear infrastructure impacts on landscape hydrology. Journal of Environmental Management. https://doi.org/10.1016/j.jenvman.2017.10.036
Until mid-January 2018, this paper is available to anyone for free, via this link: https://authors.elsevier.com/a/1WAyL14Z6tTGzZ.