Soils and fertilizers . I Fio. 15. — The upper drawing illustrates the her-ring bone system of laying tile drains. The lowerrepresents the gridiron M|^e^|kr;-7t^-l T ~ - ^^I^^SF ^^^mHB^H m ^sC/ Plate IX. Drainage. — The drain outlet is often poorly constructedand easily clogged, as shown in the upper figure. The lower one is wellprotected. SOIL WATER 83 but an acute angle should be formed between the two streamsabove the point of contact; otherwise the flow of waterwill be impeded. For the same reason two laterals shouldnot enter a main drain opposite to each other. It is desirable to
Soils and fertilizers . I Fio. 15. — The upper drawing illustrates the her-ring bone system of laying tile drains. The lowerrepresents the gridiron M|^e^|kr;-7t^-l T ~ - ^^I^^SF ^^^mHB^H m ^sC/ Plate IX. Drainage. — The drain outlet is often poorly constructedand easily clogged, as shown in the upper figure. The lower one is wellprotected. SOIL WATER 83 but an acute angle should be formed between the two streamsabove the point of contact; otherwise the flow of waterwill be impeded. For the same reason two laterals shouldnot enter a main drain opposite to each other. It is desirable to have as few main drain outlets as possible,for the outlet is Ukely to be the weakest point in a drainagesystem. If it becomes clogged, the entire system is putout of action. It is more likely to be injured by freezingthan is the undergroimd tile, and unless well protected itaffords an opening into which small animals may crawl andclog the system. The quantity of water removed by tiles of various sizes,and laid at certain distances and grades as well as otheroperations that cannot be treated here, may be ascertainedfrom the books that deal exclusiv
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Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectfertilizers
