Archive image from page 182 of Dairy farming being the. Dairy farming : being the theory, practice, and methods of dairying dairyfarmingbein00shel Year: 1880 IMPORTANCE OP A DRAIN-MAP. HI their water at fiaal outfalls {<i). lu this figure the regular drainage of a homogeneous clay upon the gridiron system is h;irdly represented. In the map, however, (Fig. -il), in which the posi- tion of the drains on an estate on the Oolitic for- mation, drained under Mr. Bailey Denton's direc- tion, is given in detail, the uni- form parallel drains on the more level fields upon the Oxford clay are full
Archive image from page 182 of Dairy farming being the. Dairy farming : being the theory, practice, and methods of dairying dairyfarmingbein00shel Year: 1880 IMPORTANCE OP A DRAIN-MAP. HI their water at fiaal outfalls {<i). lu this figure the regular drainage of a homogeneous clay upon the gridiron system is h;irdly represented. In the map, however, (Fig. -il), in which the posi- tion of the drains on an estate on the Oolitic for- mation, drained under Mr. Bailey Denton's direc- tion, is given in detail, the uni- form parallel drains on the more level fields upon the Oxford clay are fully represented at the foot of the map. The oc- casional drains, intended for the removal of spring-water, and the lateral drains, rendered necessary by the configuration of the land, and intended for the removal of water lodging in slacks upon the surface, are also recognis- able in some of the middle fields. There, too, and elsewhere, the less frequent—• generally pa- rallel — drains needed for the tapping of the more porous water - bearing strata are to be observed. Too great a stress cannot be laid on the necessity of such a plan of executed drainage—of course, on a lai-ger scale than is adopted in Fig. 41—being preserved. There are many instances in proof of this, where large sums of money have been lost entirely for want of a record of the operation. The tenants have changed, and the outfalls have been ruined and have dis- appeared.' DlSCHARGEOP Drains, com- pared WITH THE Rainfall. To ascertain the law which governs this matter, Mr. J. Bailey Denton, in the year 1S56-7, caused observations of rainfall and dis- charge from drains to be taken during the months of Octo- ber, November, December, Jan- uary, February, March, April, and May. The area experi- mented upon consisted of two kinds of soil— first, soil of a mixed nature, consisting of ela', gravel, and sand; and second, a very stiff clay, considered hard and almost im- penetrable. The mixed soil was drai
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