. Farm development; an introductory book in agriculture, including a discussion of soils, selecting & planning farms, subduing the fields, drainage, irrigation, roads, fences, together with introductory chapters concerning farm business, and the relations of general science to agriculture . Figure 76 Collared drain tiles or sewer pipes. thus taken and figured to express the height above datum,as will be explained later on. will serve as a basis forlocating the exact line and depth of the proposed the first line of stakes where the levels were taken,other levels may be taken at point
. Farm development; an introductory book in agriculture, including a discussion of soils, selecting & planning farms, subduing the fields, drainage, irrigation, roads, fences, together with introductory chapters concerning farm business, and the relations of general science to agriculture . Figure 76 Collared drain tiles or sewer pipes. thus taken and figured to express the height above datum,as will be explained later on. will serve as a basis forlocating the exact line and depth of the proposed the first line of stakes where the levels were taken,other levels may be taken at points on either side. Anew line with slight or considerable deviation from thefirst line may be projected here or there, and by placingstakes along the new line and taking several levels, itspracticability may be compared with the first this way the best place for the main drain may be. Figure 77. Branched collared tiles. accurately determined in low areas where the problem isa comparatively simple one. It is generally wise to have open ditches follow thelowest levels. This is especially true in the northern 174 FARM States, where snow and ice accumulate in open ditches,often clogging them when the surface water beginsto run in the early spring. At the points wherethe open ditch passes through slight elevations of land,the snow accumulates by drifting and serves as a damto prevent the early movement of water, whereas, if the drain follows 012 12 ii -T Ai^blt 12BJI the 1 o w estle\el, even ifthe ditch is fullof snow andice, this soonmelts or isworn away Ijythe water fromthe higher sur-faces w h i c hruns over it. A cross sec-tion or contoursurvey is some-times necessaryon a nearly Figuie 78. Elevalioius nn a Hat 40-iicre field used in Inc-atiuK . an open ditch and branch tile drains. The outlet of the open leVCl area. IMg-(Iraiu. which is feet below
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
