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Building roofs and parking lots cause prevent rain from naturally entering the ground. A bird's eye view of a building shows a footprint where water can not drain into the ground and must drain into non-footprint areas. Other objects such as tiled patios can effectively increase the footprint of roofs and parking lots.

A larger 'object footprint' reduces the area for natural draining.

What is the correct term for 'object footprint', which prevents natural draining and its complement: land that permits natural draining of water?

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Impervious Surface Area is the term you are looking for. The opposite - land that allows water to flow through - is technically "pervious" but more commonly referred to as "permeable".

  • Excellent reference. After reading it I would think Impermeable would be an apt term, though it probably makes sense to use standard terms. thank you. – gatorback Jan 28 at 22:57
  • One of the projects I work on for a customer has data for it in their building facility database, so I knew what to look for. – manassehkatz Jan 28 at 22:59

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