. Principles of irrigation engineering, arid lands, water supply, storage works, dams, canals, water rights and products. Fig. C.—Spillway of Bumping Lake dam. Yakima Project, Fig. D.—Spillways of Roosevelt Dam. Salt River Project, Ariz. DAM SITES 193 necessary to procure some form of apparatus for more systematicwork. Recourse is usually made to the ordinary well diiller who, withsuitable rig or outfit is accustomed to drilling wells through sand,gravel, boulders, and solid rock. He can usually determine withreasonable degree of accuracy the character and thickness of the dif-ferent la
. Principles of irrigation engineering, arid lands, water supply, storage works, dams, canals, water rights and products. Fig. C.—Spillway of Bumping Lake dam. Yakima Project, Fig. D.—Spillways of Roosevelt Dam. Salt River Project, Ariz. DAM SITES 193 necessary to procure some form of apparatus for more systematicwork. Recourse is usually made to the ordinary well diiller who, withsuitable rig or outfit is accustomed to drilling wells through sand,gravel, boulders, and solid rock. He can usually determine withreasonable degree of accuracy the character and thickness of the dif-ferent layers or strata, and if skillful can shut off the surface flood andascertain whether the deeper strata are fissured and carry consider-able amounts of water. Great care must be observed in taking and studying the materialbrought up. The form of drUl ordinarily employed shatters andpounds the rock into sand or powder and there is constant tendencyfor material dislodged from the upper part of the hole to fall downand become mixed with that which is being broken at the material as it is brought up in a baUer is washed with waterin such way that the finer particles ar
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectirrigat, bookyear1913
