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.
1 Check yourself as you go. 2  For instance, if the trench for the French drain is to be 100â long and the grade 1%, then by the time your trench is 50' long, it should be 6 deeper than where you began excavating. 3  You'll be digging a horizontal trench across the length of the slope. Locate the best area for a French drain. 2  Find an area along the slope on your side of the boundary where excavation would be easiest (i.e., free of obstructions). 3  Trench lines should be plotted out before you begin digging French drains.