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  2. Impervious surface - Wikipedia

    en.wikipedia.org/wiki/Impervious_surface

    In the contiguous 48 states of the US, urban impervious cover adds up to 43,000 square miles (110,000 km 2). Development adds 390 square miles (1,000 km 2) annually. Typically, two-thirds of the cover is pavements and one-third is building roofs. [2]

  3. Permeable paving - Wikipedia

    en.wikipedia.org/wiki/Permeable_paving

    Permeable pavement surfaces may be composed of; pervious concrete, porous asphalt, paving stones, or interlocking pavers. [1] Unlike traditional impervious paving materials such as concrete and asphalt, permeable paving systems allow stormwater to percolate and infiltrate through the pavement and into the aggregate layers and/or soil below.

  4. Acre-foot - Wikipedia

    en.wikipedia.org/wiki/Acre-foot

    As the name suggests, an acre-foot is defined as the volume of one acre of surface area to a depth of one foot.. Since an acre is defined as a chain by a furlong (i.e. 66 ft × 660 ft or 20.12 m × 201.17 m), an acre-foot is 43,560 cubic feet (1,233.5 m 3).

  5. Free floating screed - Wikipedia

    en.wikipedia.org/wiki/Free_floating_screed

    The screed is seen at the back of the paver, smoothing the paving mixture under the control of its operator, standing at the center of the screed. The free floating screed is a device pioneered in the 1930s that revolutionized the asphalt paving process.

  6. Pavement condition index - Wikipedia

    en.wikipedia.org/wiki/Pavement_Condition_Index

    The pavement condition index (PCI) is a numerical index between 0 and 100, which is used to indicate the general condition of a pavement section.The PCI is widely used in transportation civil engineering [1] and asset management, and many municipalities use it to measure the performance of their road infrastructure and their levels of service. [2]

  7. Roof - Wikipedia

    en.wikipedia.org/wiki/Roof

    A roof (pl.: roofs or rooves) is the top covering of a building, including all materials and constructions necessary to support it on the walls of the building or on uprights, providing protection against rain, snow, sunlight, extremes of temperature, and wind. [1]

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