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A rain gutter, eavestrough, eaves-shoot or surface water collection channel is a component of a water discharge system for a building. [1]
They should not be confused with so-called valley gutters or valley flashings which occur at the non-parallel intersection of roof surfaces, typically at right angled internal corners of pitched roofs. Provision is made in the design of the gutter to have a rain flow to the outlet with a maximum slope of 1:200 and a minimum of 1:400.
A pervious concrete street in 2005. Pervious concrete (also called porous concrete, permeable concrete, no fines concrete and porous pavement) is a special type of concrete with a high porosity used for concrete flatwork applications that allows water from precipitation and other sources to pass directly through, thereby reducing the runoff from a site and allowing groundwater recharge.
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[15] [14] [16] This type of roofing material is well-equipped to withstand wetness and rain downpours. [14] In Sanaa, Yemen, in the early 20th-century, twisted mats of palm-leaves were laid over wooden beams used to support the ceilings. [17] These mats were held in place by wooden sticks laid at right angles to the beams. [17]
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