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.
A French drain installation is a simple process that requires a whole lot of digging. Decide to learn how to install a french drain, or if itâs worth hiring a pro. A single exterior French drain trench thatâs 50 feet long means excavating about 75 cubic feet of soil. Depending on how wet your soil is (if you have a drainage problem, itâs probably pretty wet), that means 4 to 5 tons of dirt. Not only do you have to dig out the dirt, youâll have to move it somewhere.