Biennial Report of the State Highway Commissioner Volume 3

Biennial Report of the State Highway Commissioner Volume 3

List price: US$14.14

Currently unavailable

Add to wishlist

AbeBooks may have this title (opens in new window).

Try AbeBooks


This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...side ditches or gutters just large enough to provide for the free flow of water that naturally comes to the road. In clay soils the bottoms of the side ditches should be not less than two feet below the crown of the road, unless supplemented by tile drains. Especial pains must be taken to make sure that the ditches have free outlets. Tile drains are a necessity in all springy soils. A four inch land tile laid along the upper side of the road to cut off the spring water before it reaches the road bed will usually prove sufficient. A line of tile can be placed on the other side later if found necessary. It is always advisable to cover the tile to a depth of six inches or more with gravel or cinders, and in very wet soils the drainage will be facilitated by filling the entire trench with some porous material. In clay soils trenches should be cut through the shoulders described in the next paragraph, making outlets into the side ditches for water that may collect in the gravel bed during construction, and later before the surface becomes hard and water-proof. Such trenches should be eight inches or more in width and slightly deeper than the gravel bed. They should be placed at all low points in the grade and not farther than one hundred feet apart in retentive soils and filled with coarse gravel when the first layer of gravel is put on. GRAVEL BED AND SHOULDERS. After the rough grading and drainage above described have been completed the gravel bed should be formed in the central part of the road grade by placing shoulders of firm earth on each side and far enough apart to retain the proposed width of gravel, which the law provides shall be not less than nine feet wide nor less than six inches in depth. (Section 16, Chapter II). It may, however, more

Product details

  • Paperback | 30 pages
  • 189 x 246 x 2mm | 73g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236652371
  • 9781236652379