Taxonomy is the science of classifying organisms. The system currently used by taxonomists is called the Linnaean taxonomic system, in honor of Swedish biologist Carolus Linnaeus (1707 â 1778). The Linnaean system breaks down organisms into seven major divisions, called taxa (singular: taxon).
Generally speaking, the wall measures about 23 to 26 feet tall. The fracture surface of the wall is ladder type with the base measuring about 7.1 yards wide and the top measuring 6.3 yards wide on average, which makes it firm and very unlikely to collapse.
The width of the foundation should be twice that of the width of the wall you are building and the wall should be placed in the centre of the foundation. If you need to build a wall 225mm wide the foundation should be 450mm wide.This will give you a foundation overlap of 112mm either side of the finished wall.To work out how thick the wall needs to be (A) you must first work out how deep the garden will be (B) at the point you plan to build the wall.hen you have measured how deep the garden will be you simply divide it by 4 to get the required thickness of wall. If your retaining wall is holding back a 1m depth of garden then it needs to be 225mm thick. The minimum thickness of a garden retaining wall should be the width of a standard brick @ 112mm.