In vineyard site selection, air drainage is a significant topographical and climatological criterion. This is because cold air is denser than warm air, so it settles in areas of low elevation.
Cold air flows, or ‘drains’ downhill and so a continuous slope or hillside is much less prone to frost and winter freeze than a hollow. Therfore, a slight to moderate slope (5% to 10%) is desirable in vineyard sites as it accelerates the drainage of denser cold air from the vineyard.
Consequently, zones that capture cold air should be avoided as vineyard locations in regions prone to these phenomena.
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