. Bulletin . iistype of topography was the great difficulty of making surveys thioughthe unhealthful black-mud and green-water swamps. Next came theconstruction of the Panama Railroad lines across the swamps. Afeature of this construction was the necessity of vast fills with widebases. The extra width was to obviate the sinking of the fiU, withaccompanying bulgmg of the swamp material on either side of thesunken part. iVnother most important matter was the building upof a great coral flat from its original high-tide level to 3 or 4 feetabove, in order to furnish a site for the town of Colon an
. Bulletin . iistype of topography was the great difficulty of making surveys thioughthe unhealthful black-mud and green-water swamps. Next came theconstruction of the Panama Railroad lines across the swamps. Afeature of this construction was the necessity of vast fills with widebases. The extra width was to obviate the sinking of the fiU, withaccompanying bulgmg of the swamp material on either side of thesunken part. iVnother most important matter was the building upof a great coral flat from its original high-tide level to 3 or 4 feetabove, in order to furnish a site for the town of Colon and the Atlanticterminal plant of the canal and the Panama Railroad. On the otherhand, the flats formed mostly of coral debris, unhke the swamps,presented a so?Jd foundation on which to dump spoil, and thus tobuild up and prepare a sohd base for the towai. The low mud swampsand river alluvium greatly facilitated the dredging of the approachchannels to both the Atlantic and the Pacific locks. BULLETIN 86 PLATE Ibulletin86unit. 13
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
