. Bulletin of the Department of Agriculture. Agriculture; Agriculture. ROADWAY id Fig. 2. a humid climate. The following summary supplies a few suggestions as to how water may best be removed from a road bed: 1. The road surface should be crowned so as to shed water off to the side ditches as rapidly as it falls on the road. The typical cross sections (shown in figs. 15, 20, and 22) indicate the amounts of crown advisable under different conditions. These figures are supplemented by a discussion on page 9. 2. Wherever the road is in an excavation, suitable side ditches or gutters should b
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. ROADWAY id Fig. 2. a humid climate. The following summary supplies a few suggestions as to how water may best be removed from a road bed: 1. The road surface should be crowned so as to shed water off to the side ditches as rapidly as it falls on the road. The typical cross sections (shown in figs. 15, 20, and 22) indicate the amounts of crown advisable under different conditions. These figures are supplemented by a discussion on page 9. 2. Wherever the road is in an excavation, suitable side ditches or gutters should be provided along the sides so that the water may SIDE DITCH S/o/xJlL. Fig. 3. be conducted to some point where it may be turned off from the road. Figures 2, 3, and 4 show typical cross sections for earth side ditches. The cross section shown in figure 2 is suitable for steep grades where the depth of water in the side ditches must be kept low in order to prevent washing of the soil. Figure 3 shows a modified section which gives a greater capacity for the same widths of ditch than the cross section shown in figure 2, but which can be employed only on comparatively flat grades if washing is to be prevented. Figure 4 shows a cross section adapted especially to flat grades where a considerable volume of water must be carried. Ditches of the. 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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