Elementary principles of agriculture Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 288 Elementary Principles of Agriculture Not only this, but side drains should be large enough to carry off all water without washing, and graded to prevent the formation of pools on the sides. The water- table should be kept well below the surface of the road. Fig. 181. Cross sections of two good forms for eartli roads. The lower section can be made with a road machine, and both sections can be maintained with a split-log drag so that water will
Elementary principles of agriculture Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 288 Elementary Principles of Agriculture Not only this, but side drains should be large enough to carry off all water without washing, and graded to prevent the formation of pools on the sides. The water- table should be kept well below the surface of the road. Fig. 181. Cross sections of two good forms for eartli roads. The lower section can be made with a road machine, and both sections can be maintained with a split-log drag so that water will run oS easily and quickly. Fig. 182. Cross section of a road showing the result of improper construction and drainage. Note that tlie center of the road has become the lowest part and that water may collect on the surface, making the road practically impassable. Fig. 183. Cross section of road, showing clay cover on 'deep' sand subsoil Fig. 18-1. Cross section of Macadam road, showing a compact foundation of earth supporting; a solid and durable stone surface. Fig. 185. Transverse section of Telford road with Macadam surface. Suitable culverts should be provided to dispose of storm water. These should have sufficient fall from the upper to the lower side to wash out all sediment. 409. Surfaced Roads. Different kinds of material are used in surfacino; roads. In sections where suitable gravel
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