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A percolation test (colloquially called a perc test) is a test to determine the water absorption rate of soil (that is, its capacity for percolation) in preparation for the building of a septic drain field (leach field) or infiltration basin. [1] The results of a percolation test are required to design a septic system properly.
Percolation is the study of connectivity in random systems, such as electrical conductivity in random conductor/insulator systems, fluid flow in porous media, gelation in polymer systems, etc. [1] At a critical fraction of connectivity or porosity, long-range connectivity can take place, leading to long-range flow.
The Building Research Establishment is owned by the BRE Trust, a registered charity that works to support research and education in the built environment.All of the profits accrued by BRE are passed to the Trust and are used to fund new research and education programmes designed to meet the Trust's goal of promoting safety and sustainability.
In two dimensional square lattice percolation is defined as follows. A site is "occupied" with probability p or "empty" (in which case its edges are removed) with probability 1 – p; the corresponding problem is called site percolation, see Fig. 2. Percolation typically exhibits universality.
The B recognition element (BRE) is a DNA sequence found in the promoter region of most [clarification needed] genes in eukaryotes and Archaea. [1] [2] The BRE is a cis-regulatory element that is found immediately near TATA box, and consists of 7 nucleotides. There are two sets of BREs: one (BREu) found immediately upstream of the TATA box, with ...
BREEAM logo. The Building Research Establishment Environmental Assessment Method (BREEAM), first published by the Building Research Establishment in 1990, [1] is touted as the world's longest established method of identifying the sustainability of buildings.
Groundwater recharge or deep drainage or deep percolation is a hydrologic process, where water moves downward from surface water to groundwater. Recharge is the primary method through which water enters an aquifer. This process usually occurs in the vadose zone below plant roots and is often expressed as a flux to the water table surface.
PERC, Perc or perc may refer to: Shortened form of percocet; Acronym for preservation, enhancement, restoration or creation (of a natural resource) in environmental mitigation; Perc test (percolation test), for determining the water absorption rate of soil; PERC Reporting Standard, the European standard for mineral reporting