Dry valley
A dry valley is a valley, formed by water erosion, with no permanent surface stream. Dry valleys typically occur in areas where porous rock (rock which absorbs water, such as chalk and limestone) is present. Ref The HS2 London-West Midlands Environmental Statement, published by the Department for Transport in November 2013.
Geoarchaeology, Using Earth Sciences to Understand the Archaeological Record, published by Historic England in 2015, defines a dry valley as: ‘…a valley with no stream in it, common in areas with chalk bedrock.’
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