The primary function of bibliographic citations is to assist the reader in finding the sources used in the writing of a work. To these basic citations, the annotated bibliography adds descriptive and evaluative comments (i.e., an annotation), assessing the nature and value of the cited works. The addition of commentary provides the future reader or researcher essential critical information and a foundation for further research.
French drain. A French drain or weeping tile (also blind drain, rubble drain, rock drain, drain tile, perimeter drain, land drain, French ditch, sub-surface drain, sub-soil drain or agricultural drain) is a trench filled with gravel or rock or containing a perforated pipe that redirects surface water and groundwater away from an area.
âThe purpose of a French drain is to effectively drain water, while creating an aesthetically pleasing landscape, says Lunt. You donât want the pipes to show, so in a typical 12- by 12- by 4-inch system, youâd be digging a trench 12 inches wide by 12 inches deep and using a 4-inch pipe.unt emphasizes that your drain should be at least 12 inches below the ground at the groundâs lowest point; depending upon the topography, you may be digging a trench of varying depth.