Engineering and Contracting . the Stony Riier Dam. Weep holes anddrainage are absurd in a climate where waterfreezes. It is a crime to design a dam liithout considering upward pressure. Very truly yours, Edward Godfrev. Monongahela Rank Rldg., Pittsburgh^ PaIeb. 5, li)U. Some Notes on Costs of Loading Motor Trucks From Ground Storage Piles. Contributed bv H. D. Pratt, Engineer, Linlv-Belt Co., , Pa, The ability of the motor truck to carry bull,material distances in quantities and ata rate of speed makes it possible to reduce the cost of transportingcrushed
Engineering and Contracting . the Stony Riier Dam. Weep holes anddrainage are absurd in a climate where waterfreezes. It is a crime to design a dam liithout considering upward pressure. Very truly yours, Edward Godfrev. Monongahela Rank Rldg., Pittsburgh^ PaIeb. 5, li)U. Some Notes on Costs of Loading Motor Trucks From Ground Storage Piles. Contributed bv H. D. Pratt, Engineer, Linlv-Belt Co., , Pa, The ability of the motor truck to carry bull,material distances in quantities and ata rate of speed makes it possible to reduce the cost of transportingcrushed stone, coal, sand, gravel, etc. Tinspeed of travel is high as compared with thehorse-drawn vehicle. The unloading is autouiatic, the truck body being dumped by leverby the operator. In many cases the truck isloaded from an overhead chute, but more oftenthe material to be moved lies on the groundin storage piles, not only in regular storageyards, Init in streets, roads or wherever mostconvenient. The high cost of loading motor. Fig. 1, Loading Crushed Stone Into Motor Truck With Portable Truck Loader. too great a ]ircssurc from tlie overlying struc-ture? If .so, why did the structure hold to-gether and let the foundation run away fromunder it? Why did one structure hang in theair after the failure, if it was so heavy? If the foundation did not fail from greatpressure, what was the nature of the failureof the foundation? Earth dams exist withoutany masonry—dams made merely of a dam of this sort to be transformedby converting the crest triangle into a hollowshell with very little weight. Water gets un-der this shell and lifts it enough to makea horizontal fissure through which a streamquickly starts, carrying mud with it. Mudis scoured away under this shell until thewhole is underwashed and either remains sus-pended or breaks up and falls in clnmks intothe hole. Is this a failure of the foundation?If so, why was the foundation good in thecase of the earth dam and not
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