Engineering and Contracting . rmed thewall of the power house, which was veryheavy and thoroughly waterproofed. The work of repairing the damage andstrengthening the pipe line by inserting strongradial bars was well under way, when latein March, 1913, the great floods which devas-tated Ohio spent a part of their force on theSandusky River. The concrete wall (beforereferred to) which connected tlie head worksof the dam with the north bank consisted ofan earth fill with a protection wall on thewater side. This concrete wall was intended,and was designed and constructed only as aprotection to the
Engineering and Contracting . rmed thewall of the power house, which was veryheavy and thoroughly waterproofed. The work of repairing the damage andstrengthening the pipe line by inserting strongradial bars was well under way, when latein March, 1913, the great floods which devas-tated Ohio spent a part of their force on theSandusky River. The concrete wall (beforereferred to) which connected tlie head worksof the dam with the north bank consisted ofan earth fill with a protection wall on thewater side. This concrete wall was intended,and was designed and constructed only as aprotection to the earth fill in the rear. When 218 Engineering and Contracting Vol. XLI. No. the flood reached the dam the spillway, floodgates, and open forebay were insufficient topass the torrent, and the water gradually roseuntil it overflowed the concrete protectionwall. The earth filling behind it was soonwashed away, and the thin facing wall stoodalone to hold back a torrent which flowed \Mft. over its crest, and 13 ft. over the spill-. .r^^pi-^ l6-9/2(b) s,*vi;+ 2Z0- ?\ zii bed rock every !8 Fig. 4. Section of Bank Protection Wall,Baltvllle Hydro-Electric Plant. way. It was not constructed to withstandsuch pressure and on March 25 collapsed, ata time when the total discharge of the river,it is estimated, was cu. ft. per this volume about 4,500 cu. ft. were flow-ing over the facing wall. When the retaining wall failed the releasedwall of water tore the reconstructed portionof the pipe line from its foundation piers,and carried it down the river. At the coveredwagon bridge a quarter of a mile below asection was carried against a masonry pierwith such force as to be wound completelyaround it. The flood damage to the powerproject was considerable, and resulted innumerous changes in the original constructionplans. RECONSIRLCTED PLANT. Figure 1 shows the reconstructed worksplan ; the changes made were confined whollyto the dam structures and the upper end
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