The size of the drain field is determined by how well the ground absorbs water. In places where the ground is hard clay that absorbs water very slowly, the drain field has to be much bigger. A septic system is normally powered by nothing but gravity.he size of the drain field is determined by how well the ground absorbs water. In places where the ground is hard clay that absorbs water very slowly, the drain field has to be much bigger. A septic system is normally powered by nothing but gravity.
Filed Under: Tech & Science, mental health. Every year, about 42.5 million American adults (or 18.2 percent of the total adult population in the United States) suffers from some mental illness, enduring conditions such as depression, bipolar disorder or schizophrenia, statistics released Friday reveal.
Nearly 5 million children in the U.S. have some type of serious mental illness (one that significantly interferes with daily life). In any given year, 20% of American children will be diagnosed with a mental illness. The term mental illness is not entirely accurate, because there are many physical factors -- including heredity and brain chemistry -- that might be involved in the development of a mental disorder.