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.
After locating the best area for a French drain. Trench lines should be plotted out before you begin digging your French drains. Obviously the French Drain does not have to go in a straight line but it does have to slope at least at a 1% grade. A 1% Grade would have a drop of 1 foot for every 100 feet in length. Check your Slope as you as you go. 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 50â long, the drop should be 6â. 3. Using a water level to check your progress is easy.