A septic drain field should be 10 feet from the home or any body of water, and 10 feet from gardens and edible plants. Dig the trenches. Each drain-field trench should be at least 3 to 4 feet wide and 3 to 4 feet deep.There should be at least 100 feet of drain field for a 1,000-gallon septic tank. This can be accomplished by making four trenches 25 feet long or two trenches 50 feet long.uilding a septic drain field is time-consuming but pays off in the long run. Septic tanks last from 15 to 30 years. Unfortunately, drain fields, also known as leach fields, do not last that long. If placed in an area with good ground absorption, a drain field can last up to 10 years.
The fastest growing demographic on Twitter is the 55â64 year age bracket. 1  This demographic has grown 79% since 2012. 2  The 45â54 year age bracket is the fastest growing demographic on both Facebook and Google+. 3  For Facebook, this group has jumped 46 4 %. For Google+, 56 %.
Data & Statistics - Facts About California's Elderly. California is projected to be one of the fastest growing States in the nation in total population. In 1990, California comprised 12 percent of the nation's population and is expected to have 14 percent of the nation's population by 2020 (an increase of 15.7 million people). In California, the elderly population is expected to grow more than twice as fast as the total population and this growth will vary by region. The maps show the percentage increases for the elderly (age 60 and over) and the oldest old (age 85 and over) populations from 1990 to 2020 for all 58 counties in California.