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 On average, depending on the type, the costs of a French drain can vary anywhere from as little as $10 to as much as $30 per foot. 2  Thealternativepress.com provides the following average prices of French Drain from A-1 Basement Solutions:ips to know: 1  The cost of French Drain is determined by linear feet round the boundary of the basement. 2  A shallow French drain is suitable in areas where surface water is always soggy or keeps rushing across it. 3  A shallow drain is usually two feet deep and 1.5 feet across.