Parks and park engineering . SEWERS 93 must be pumped out before the work can be joined. Theditching is done by pick and shovel. The shovels may beeither short-handled or long-handled. The former aregenerally better, as the men are more familiar with theiruse. Grade is given by stakes driven on the side of thetrench on which the cut from the top of the stake is markedin feet and inches. These stakes are driven every 50 feetexcept for main ditches, when they should be 25 feet minimum grade for mains is 1 inch per 100 feet and forlaterals 3 inches. The trenches are hollowed out on theb
Parks and park engineering . SEWERS 93 must be pumped out before the work can be joined. Theditching is done by pick and shovel. The shovels may beeither short-handled or long-handled. The former aregenerally better, as the men are more familiar with theiruse. Grade is given by stakes driven on the side of thetrench on which the cut from the top of the stake is markedin feet and inches. These stakes are driven every 50 feetexcept for main ditches, when they should be 25 feet minimum grade for mains is 1 inch per 100 feet and forlaterals 3 inches. The trenches are hollowed out on thebottoms for the collars so that the weight on the tile maynot be borne at the ends. Tile drains should be laidbelow frost and out of reach of rootlets, particularly ofwillows. Professor Mapes, who is quoted by ColonelWaring, specifies that drains must be 3 feet deep when 20feet apart, 4 feet deep when 40 feet apart, and 5 feet deepwhen 80 feet apart. In backfilling no stones should be placed closer than 6inches to the tile an
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishere, booksubjectparks
