Septic drain fields, also called leach fields or leach drains, are subsurface wastewater disposal facilities used to remove contaminants and impurities from the liquid that emerges after anaerobic digestion in a septic tank. A septic tank, the septic drain field, and the associated piping compose a septic system.
The septic drain field is effective for disposal of organic materials man capital flight refers to the emigration of individuals who have received advanced training at home.
The net benefits of human capital flight for the receiving country are sometimes referred to as a " brain gain" whereas the net costs for the sending country are sometimes referred to as a " brain drain". In occupations that experience a surplus of graduates, immigration of foreign- trained.