Search results
Results from the WOW.Com Content Network
Impervious surface percentage in various cities. The percentage imperviousness, commonly referred to as PIMP in calculations, is an important factor when considering drainage of water. It is calculated by measuring the percentage of a catchment area which is made up of impervious surfaces such as roads, roofs and other paved surfaces.
Flooded streets in New Orleans Relationship between impervious surfaces and surface runoff Urban runoff is a major cause of urban flooding , the inundation of land or property in a built-up environment caused by rainfall overwhelming the capacity of drainage systems , such as storm sewers . [ 12 ]
Surface runoff often occurs because impervious areas (such as roofs and pavement) do not allow water to soak into the ground. Furthermore, runoff can occur either through natural or human-made processes. [5] Surface runoff is a major component of the water cycle. It is the primary agent of soil erosion by water.
A stormwater fee is a charge imposed on real estate owners for pollution in stormwater drainage from impervious surface runoff.. This system imposes a tax that is proportional to the total impervious area on a particular property, including concrete or asphalt driveways and roofs, that do not allow rain to infiltrate.
Impervious surfaces prevent rainfall from infiltrating into the ground, thereby causing a higher surface run-off that may by higher than the local drainage capacity. [2] The effects of climate change on the water cycle can also change the severity and frequency of urban flooding.
The best part of the science fair, Recio said, is testing out experiments. Third grade student William Kim admires a winning science fair project on ants at Miller High School on Friday, Jan. 19 ...
A type of bacteria dubbed “Conan the Bacterium” can withstand radiation thousands of times stronger than what can kill a human. Now, scientists have figured out why.
The capture ratio is the ratio of the rain garden's area to the impervious area that drains onto it. Rain garden in the Allen Centennial Gardens on the campus of the University of Wisconsin-Madison GreenRoof: Green roofs are another variation of a bio-retention cell that have a soil layer laying atop a special drainage mat material that conveys ...