Elements of agriculture; a text Elements of agriculture; a text book for public schools elementsofagricu00shep Year: 1905 ROADS. 209 the ditches will rapidly absorb and carry away the water which does not find an outlet within a few hours after it falls. They have the advantage of allowing the use of shallow road ditches, and of assuring more certain and thorough drainage. Laying tile in the manner described is rather expensive, and is prac- ticed only in older and more wealthy communities. Fig. 73. Subdrain con- Culverts. Natural waterways structed with drain tile . , i t -, â , and stone
Elements of agriculture; a text Elements of agriculture; a text book for public schools elementsofagricu00shep Year: 1905 ROADS. 209 the ditches will rapidly absorb and carry away the water which does not find an outlet within a few hours after it falls. They have the advantage of allowing the use of shallow road ditches, and of assuring more certain and thorough drainage. Laying tile in the manner described is rather expensive, and is prac- ticed only in older and more wealthy communities. Fig. 73. Subdrain con- Culverts. Natural waterways structed with drain tile . , i t -, â , and stone. must not DC dammed by road grades, hence culverts and bridges must be supplied to avoid obstructing them. Tile drains form one of the most efficient and durable forms of culverts. Where wa- terways are too wide to admit of the use of tile drains, wood- en structures are usually pro- Fig. 74. Subdrain made ^ided. If stouc archcs cau be ?eyfnf 'sprTn/^'wSe; built, they form a permanent under or alongside of ^^^ therefore economical con- struction for the passage of streams; although the first cost is usually too great to permit of their adop- tion. Weedy Roadsides. Weeds should not be allowed to grow along the roadsides. They give the road a slovenly and neglected appearance; they prevent quick and complete drainage of the surface, and they cause snow to lodge and form drifts during the win- ter season. The occasional use of the harrow will
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