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  2. Septic drain field - Wikipedia

    en.wikipedia.org/wiki/Septic_drain_field

    A septic drain field, a septic tank, and associated piping compose a septic system. The drain field typically consists of an arrangement of trenches containing perforated pipes and porous material (often gravel) covered by a layer of soil to prevent animals (and surface runoff) from reaching the wastewater distributed within those trenches. [1]

  3. List of free geology software - Wikipedia

    en.wikipedia.org/wiki/List_of_free_geology_software

    This is a list of free and open-source software for geological data handling and interpretation. The list is split into broad categories, depending on the intended use of the software and its scope of functionality. Notice that 'free and open-source' requires that the source code is available and users are given a free software license.

  4. Percolation test - Wikipedia

    en.wikipedia.org/wiki/Percolation_test

    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.

  5. Leaching (metallurgy) - Wikipedia

    en.wikipedia.org/wiki/Leaching_(metallurgy)

    A good example of the autoclave leach process can also be found in the metallurgy of zinc. It is best described by the following chemical reaction: [citation needed] 2 ZnS + O 2 + 2 H 2 SO 4 → 2 ZnSO 4 + 2 H 2 O + 2 S. This reaction proceeds at temperatures above the boiling point of water, thus creating a vapour pressure inside the vessel.

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  7. ConceptDraw DIAGRAM - Wikipedia

    en.wikipedia.org/wiki/ConceptDraw_DIAGRAM

    A set of solution add-ons that include collections of task-oriented templates and vector stencils libraries, [5] have been released for ConceptDraw DIAGRAM, relating to certain industry-specific graphical tasks. Starting with version 11, DIAGRAM supports using the LaTeX typesetting system in formulas and text. [6]

  8. In situ leach - Wikipedia

    en.wikipedia.org/wiki/In_situ_leach

    In-situ leach works by artificially dissolving minerals occurring naturally in the solid state. The process initially involves the drilling of boreholes into the ore deposit. Explosive or hydraulic fracturing can be used to create open pathways in the deposit for the solution to penetrate. Leaching solution is pumped into the deposit where it ...

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