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  2. Drainage equation - Wikipedia

    en.wikipedia.org/wiki/Drainage_equation

    A drainage equation is an equation describing the relation between depth and spacing of parallel subsurface drains, depth of the watertable, depth and hydraulic conductivity of the soils. It is used in drainage design. Parameters in Hooghoudt's drainage equation. A well known steady-state drainage

  3. Acid sulfate soil - Wikipedia

    en.wikipedia.org/wiki/Acid_sulfate_soil

    Retained Acidity (RA) is a measure of sparingly soluble sulfates such as jarosite and schwertmannite, which slowly generate acidity via the release and hydrolysis of Al 3+ and Fe 3+. The Acid Neutralising Capacity (ANC) of the soil sample is subtracted from the sum of the PSA, TAA and RA to calculate the net acidity .

  4. Groundwater recharge - Wikipedia

    en.wikipedia.org/wiki/Groundwater_recharge

    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 .

  5. Drainage density - Wikipedia

    en.wikipedia.org/wiki/Drainage_density

    According to Montgomery and Dietrich’s equation, drainage density is a function of vertical hydraulic conductivity. Coarse-grained sediment like sand would have a higher hydraulic conductivity and are predicted by the equation to form a relatively higher drainage density system than a system formed by finer silt with a lower hydraulic ...

  6. Groundwater energy balance - Wikipedia

    en.wikipedia.org/wiki/Groundwater_energy_balance

    The energy balance of groundwater flow can be applied to flow of groundwater to subsurface drains. [2] The computer program EnDrain [3] compares the outcome of the traditional drain spacing equation, based on Darcy's law together with the continuity equation (i.e. conservation of mass), with the solution obtained by the energy balance and it can be seen that drain spacings are wider in the ...

  7. Obesity Rates in the U.S. Drop for the First Time in a Decade ...

    www.aol.com/obesity-rates-u-drop-first-204508332...

    A recent study found that 6% of adults in the U.S. — or 1 in 8 — have taken the medication. While the decrease is an "encouraging reversal," the study says "obesity remains a considerable ...

  8. GOP report: Liz Cheney should be investigated by FBI ... - AOL

    www.aol.com/gop-report-liz-cheney-investigated...

    The Committee on House Administration's Subcommittee on Oversight Chairman Barry Loudermilk, R-Ga., released the report, his second major report on the Jan. 6 storming of the Capitol. From the report:

  9. Soil chemistry - Wikipedia

    en.wikipedia.org/wiki/Soil_chemistry

    Soil chemistry is the study of the chemical characteristics of soil.Soil chemistry is affected by mineral composition, organic matter and environmental factors. In the early 1870s a consulting chemist to the Royal Agricultural Society in England, named J. Thomas Way, performed many experiments on how soils exchange ions, and is considered the father of soil chemistry. [1]

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