Drainage of farm lands (1910) Drainage of farm lands drainageoffarmla00mcda Year: 1910 DRAINAGE OF FARM LANDS—M'DANIEL. 7 and has side slopes of nearly one to one. Fig. 1 shows a cross- section of a typical ditch. Contractors usually do the work for from eighty cents to one dollar and a half per rod, depending n the size of the ditch. Where the soil is wet and the surface has a uniform slope, this method can be satisfactorily used for con- structing small ditches. However, for uneven ground and deep ditches, it fails in being unable to excavate the bottom of the ditch to a true and uniform g
Drainage of farm lands (1910) Drainage of farm lands drainageoffarmla00mcda Year: 1910 DRAINAGE OF FARM LANDS—M'DANIEL. 7 and has side slopes of nearly one to one. Fig. 1 shows a cross- section of a typical ditch. Contractors usually do the work for from eighty cents to one dollar and a half per rod, depending n the size of the ditch. Where the soil is wet and the surface has a uniform slope, this method can be satisfactorily used for con- structing small ditches. However, for uneven ground and deep ditches, it fails in being unable to excavate the bottom of the ditch to a true and uniform grade and the resulting drain is too shallow for under-drainage. (c) Where large areas of flat, low, wet lands are to be drained, such as we have along the river bottoms in the southern and eastern counties, and in the so-called dry lake beds in Clark, Kingsbury and Codington counties in this State; the construction of the large outlet channels is most economically and readily made with the floating dredge. This consists of a rectangular shaped hull or boat built of heavy timbers and carrying in the rear the boiler and swinging and hoisting engines. On the front end of the boat is the boom or crane carrying the dipper and dip- per handle. The dipper on the lower end of the dipper handle £>y /^/oaT^Tt? £>//>/>€/- ^r-ec^&< is raised and lowered by the motion of the dipper handle be- tween the two sections of the boom, which is swung from side to side by the swinging engines. The dipper has a capacity of from three-quarters to two and one-half cubic yards, depending on the size of the dredge. Spuds or anchors, one on each side near
Size: 2200px × 909px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
