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.
Permeable pavements are designed to replace Effective Impervious Areas (EIAs), but can be used, in some cases, to manage stormwater from other impervious surfaces on site. [14] Use of this technique must be part of an overall on site management system for stormwater, and is not a replacement for other techniques.
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. [1] Surface runoff is a major component of the water cycle. It is the primary agent of soil erosion by water.
For example, sheer vertical features are possible. Without nearby bare soil, or natural drainage channels, swales or culverts, hardscape with an impervious surface requires artificial methods of drainage or surface runoff to carry off the water that would normally be absorbed into the ground as groundwater and prevent premature wear to itself.
The U.S. Preventive Services Task Force released a draft recommendation advising against using vitamin D to prevent falls and fractures in people over 60. Pharmacist Katy Dubinsky weighs in.
Superyachts serve as floating palaces for the world’s elite.These opulent vessels, which are larger than most apartments and cost more than a mansion, are often custom-built to reflect the ...
Example of turf grid. The largest feature of the parking lot is its paved area, hence, by changing this surface to be more permeable to water the parking lot will drain better. Some surface options are open joint pavers, porous asphalt, pervious concrete, or a turf grid. Drainage may be an important part of a green parking lot because runoff is ...