Illustrations, tables, graphs, references p. 579-612, index p. 613-620

DRAINAGE is a word of many meanings. For example, the drainage of an area may refer to the physical network of streams and surface waterways in an area, or it may refer to the water which is being carried by these streams. Neither of the above definitions is pertinent to this book because we are primarily interested in the drainage of agricultural land, and we have narrowed our attention to consider, in the main, the removal of excess subsurface water by means of conduits or other water-conveying devices. Our interest centers therefore on the “act” of drainage—the methods and means that can be used to drain the land. Additionally, since we have specified that our concern is with the drainage of “agricultural lands,” it follows that we are concerned with water tables, movement of water through soil, and the relationships that exist between water tables and crops. It is on this broad base that the monograph is developed

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