page_title: Low-water crossing
hierarchical_section_title: Low-water crossing
caption_attribution_description: English: Afon Irfon, below the Devil's Staircase, Powys The former drovers' road to Tregaron crosses the Afon Irfon near Llanerch-yrfa three times in four hundred metres. This used to be by means of fords, as marked on most maps. (Does anyone have access to photographs showing how it used to be?). Now, each one has been built up by means of piped culverts under concrete/asphalt - a structure known as an Irish bridge. In times of flood, these are covered, and can be used as fords. Heavy rain fell about 36 hours before this image was taken, and a lot more was forecast as I made my "escape".
context_page_description: A low-water crossing provides a bridge when water flow is low. Under high-flow conditions, water runs over the roadway and precludes vehicular traffic. This approach is cheaper than building a bridge to raise the level of the road above the highest flood stage of a river, particularly in developing countries or in semi-arid areas with rare high-volume rain. Low-water crossings can be dangerous when flooded.
context_section_description: A low-water crossing (also known as an Irish bridge, causeway in Australia, low-level crossing or low-water bridge) provides a bridge when water flow is low. Under high-flow conditions, water runs over the roadway and precludes vehicular traffic. This approach is cheaper than building a bridge to raise the level of the road above the highest flood stage of a river, particularly in developing countries or in semi-arid areas with rare high-volume rain. Low-water crossings can be dangerous when flooded.
caption: The drovers' road from Abergwesyn to Tregaron, Wales, crosses the Afon Irfon via the Irish bridge at the foot of the Devil's Staircase
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