. Bulletin of the Department of Agriculture. Agriculture; Agriculture. DEAINAGE METHODS FOE COUNTY EOADS. 27 instead of the drop inlet and catch basin sho^Yn in figures 8 and 9. The dimensions shown in the figures are considered minimum for good practice, and it may be necessary to increase them where the vohime of water to be cared for is large. The photograph in Plate III shows a cast-iron grating suitable for covering either a catch basin of the design shown in figure 9 or a drop inlet of similar design. Where these structures' are suffi- ciently far removed from the traveled way to ob
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. DEAINAGE METHODS FOE COUNTY EOADS. 27 instead of the drop inlet and catch basin sho^Yn in figures 8 and 9. The dimensions shown in the figures are considered minimum for good practice, and it may be necessary to increase them where the vohime of water to be cared for is large. The photograph in Plate III shows a cast-iron grating suitable for covering either a catch basin of the design shown in figure 9 or a drop inlet of similar design. Where these structures' are suffi- ciently far removed from the traveled way to obviate danger to traffic the cover design in figure 8 may be used. The practice of z'-r. B-B CONCRETE V'END WALL FOR PIPE CULVERTS ^10"— 2- 0 — 10'^ 4 J- / —^ -A = _ j -* 4-0'^ Fig. 10. PLAN leaving the tops open always is objectionable on account of danger to animals, and also because the opening becomes obstructed with sticks, leaves, etc. COSTS. Such structures as are shown in figures 8, 9, and 10 usually may be constructed of 1:2:4 concrete at a cost of from $12 to $18 per cubic yard, including all form work. The labor cost per cubic yard should seldom exceed about $10. The cost of suitable cast-iron covers, where standard designs are employed, averages about 2| cents per pound in 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 United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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