What is the definition of imperviousness?

impervious \im-PER-vee-us\ adjective. 1 a : not allowing entrance or passage : impenetrable. b : not capable of being damaged or harmed. 2 : not capable of being affected or disturbed.

What is impervious factor?

Impervious surfaces are defined as the surfaces that prohibit the infiltration of water from the land surface into the underlying soil. Imperviousness is the most critical indicator for analyzing impacts of urbanization on the water environment.

How do you calculate percent imperviousness?

Math Work: Add the total of all the impervious surface areas and divide it by the total of the PSA Area and multiply it by 100 for the percentage of impervious surface.

What is considered impervious area?

Impervious surfaces means those surfaces which do not absorb water. They consist of all buildings, parking areas, driveways, roads, sidewalks, and any areas of concrete or asphalt. In the case of lumberyards, areas of stored lumber constitute impervious surfaces.

What does impervious mean in Lord of the Flies?

impervious. not admitting of passage or capable of being affected.

What does impervious mean in geography?

impervious in Geology topic 2 technical not allowing anything to enter or pass through impervious volcanic rockimpervious to materials that are impervious to waterExamples from the Corpusimpervious• How could I have been so thick-headed, I wonder now, so impervious?

How does impervious surfaces affect the environment?

Essentially, in built areas with extensive impervious surfaces, water can’t soak naturally into the earth — instead it rushes across the landscape, carrying pollutants and biological contaminants into our waterways, poisoning fish, wildlife, and us.

How do impervious surfaces affect biodiversity?

Loss of Biological Diversity: The Center for Watershed Protection reports that hydrologic alteration, habitat loss, and decreased water quality “stresses aquatic species and collectively diminishes the quality and quantity of habitat.” Therefore, increasing impervious surface coverage generally results in reduced …

What are examples of impervious surfaces?

An impervious surface is a hard surface that does not let water soak into the ground or greatly reduces the amount of water that soaks into the ground….Examples include:

  • roofs.
  • solid decks.
  • patios.
  • sidewalks.
  • driveways.
  • parking areas.
  • roads.
  • compacted gravel.

What is impervious surface ratio?

impervious surface ratio is the relationship between the total impervious surface area on a site and the gross land area. The ISR is calculated by dividing the square footage of the area of all impervious surfaces on the site by the square footage of the gross land area.

Why is impervious important?

Ranging from residential rooftops, patios and driveways to town roads, public build- ings, commercial structures and parking lots, impervious cover prevents rain and snow from soaking into the ground, turning it into storm- water runoff.

How do impervious surfaces affect the water cycle?

As more and more people inhabit the Earth, and as more development and urbanization occur, more of the natural landscape is replaced by impervious surfaces, such as roads, houses, parking lots, and buildings that reduce infiltration of water into the ground and accelerate runoff to ditches and streams.

What is the dictionary definition of imperviousness?

Define imperviousness. imperviousness synonyms, imperviousness pronunciation, imperviousness translation, English dictionary definition of imperviousness. adj. 1. Incapable of being penetrated: a material impervious to water. 2. Incapable of being affected: impervious to fear. im·per′vi·ous·ly adv….

What is the meaning of impervious carpet?

Definition of impervious 1a : not allowing entrance or passage : impenetrable a coat impervious to rain b : not capable of being damaged or harmed a carpet impervious to rough treatment

What is the difference between impenetrability and perviousness?

imperviousness – the quality of being impenetrable (by people or light or missiles etc.) penetrability, perviousness – the quality of being penetrable (by people or light or missiles etc.)

What is the root word of impervius?

It comes from the Latin impervius, which adds the prefix im- to pervius, meaning “passable” or “penetrable.” Pervius -which is also the source of the relatively uncommon English word pervious, meaning “accessible” or “permeable”-comes from per-, meaning “through,” and via, meaning “way.”