. American highways; a popular account of their conditions, and of the means by which they may be bettered . nicate freely with a permanentlyopen exit. The slope of all such drains as here describedshould be, if conveniently possible, at least three inchesto the hundred feet. To accomplish this result is often aconsiderable task to the engineer, as the level of the roadhas to be adjusted in relation to the project. The open side drains or gutters should have a depth andwidth proportionate to the amount of water which theyhave to carry. If the amount of this which comes fromthe neighboring coun
. American highways; a popular account of their conditions, and of the means by which they may be bettered . nicate freely with a permanentlyopen exit. The slope of all such drains as here describedshould be, if conveniently possible, at least three inchesto the hundred feet. To accomplish this result is often aconsiderable task to the engineer, as the level of the roadhas to be adjusted in relation to the project. The open side drains or gutters should have a depth andwidth proportionate to the amount of water which theyhave to carry. If the amount of this which comes fromthe neighboring country on either side of the road be notunusually great, the depression need, in most cases, be nomore than thirty inches wide, with a depth of no more thanthree inches. It is often the best plan to leave the guttersfor a few months after the road is constructed, so that the 134 AMERICAN HIGHWAYS effect of the water upon their bottoms and sides may beestimated from experience. Where the conditions are suchas to permit of a grass bottom the channel may be pavedwith sod, or often merely sowed down. Where the. -Cross-section of Macadam roadway laid on compact earth,and made solid and permanent by heavy rolling.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
