. Engineering for land drainage. A manual for laying out and constructing drains for the improvement of agricultural lands. Drainage. 8S ENGINEERING FOR LAND DRAINAGE. inch .50. To compute this, add the drop to the ele- vation of grade line at the point of junction, which will give elevation of starting-point of branch. Example: At station of notes, Branch No. I is to have a drop of .20. The grade line + .20 = = elevation of grade line at outlet branch. This % A. Fig. 18.—Angle and Drop foi' Tile Dx-ain. should be transferred to the notes of Branch No. i and used as the initia
. Engineering for land drainage. A manual for laying out and constructing drains for the improvement of agricultural lands. Drainage. 8S ENGINEERING FOR LAND DRAINAGE. inch .50. To compute this, add the drop to the ele- vation of grade line at the point of junction, which will give elevation of starting-point of branch. Example: At station of notes, Branch No. I is to have a drop of .20. The grade line + .20 = = elevation of grade line at outlet branch. This % A. Fig. 18.—Angle and Drop foi' Tile Dx-ain. should be transferred to the notes of Branch No. i and used as the initial point for computing the grade of that line. If short bends or curves are necessary a little additional grade should be allowed, provided it can be had. The depth at which it is desired to lay the drains will often have much to do with the determination of the grades. No inflexible rule can be given, but uni- formity should as much as possible be secured. If the flow in drains is alternately slow and rapid and then stands still, the tile being full at one place and half full at others, the efficiency of the drain is only part of what it might be were the grades carefully arranged and the size of the tile proportioned to them. A care- ful survey and corresponding adjusted grade will often. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Elliott, Charles Gleason, 1850-1926. New York, J. Wiley
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