. Railroad structures and estimates . ITY OF (Inches fall to 100 feet.) 2 in. Sin. 6 in. 24 in. Galbns discharged p« minute. 18 2,000 2,.500 3,.500 4,.5O0 5,000 7,000 S,.500 24 4,.500 .5,.500 ) 10,.tOO ) 1H,(XX) 30 9,50r) i ) 2^) .) 36 12,500 15,.500 1 22,(m , 26,600 j 31,fXX) 43,.500 ,000 Main s allowance for seveie st orou, which are generally of abort duratioo. 138 TILE PIPE CULVERTS. Tile Pipe Culverts. (Fig. 38.) — Tile pipe must have at least4 feet of embankment on top. TABLE 64. —
. Railroad structures and estimates . ITY OF (Inches fall to 100 feet.) 2 in. Sin. 6 in. 24 in. Galbns discharged p« minute. 18 2,000 2,.500 3,.500 4,.5O0 5,000 7,000 S,.500 24 4,.500 .5,.500 ) 10,.tOO ) 1H,(XX) 30 9,50r) i ) 2^) .) 36 12,500 15,.500 1 22,(m , 26,600 j 31,fXX) 43,.500 ,000 Main s allowance for seveie st orou, which are generally of abort duratioo. 138 TILE PIPE CULVERTS. Tile Pipe Culverts. (Fig. 38.) — Tile pipe must have at least4 feet of embankment on top. TABLE 64. — APPROXIMATE COST. Innerdiam. Min. thick-ness shell. Depth ofsocket. Annularspace. Weight perlin. ft. per ft. Rip-rap walls for ends when re- quired (Fig. 381, cu. yd. 8101215182024 In. s 83 4781 un 1! 2 2430303030303030 2h 2f 21 3 3 3i 31 4 In. 1 25 858 f f 5 858 f 16 25 37 45 . 76118138190 $ 8 9 10 11 12 Excavating, laying, and refilling CROSS SECTION
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