226 INDEX. 



PAGE 



Frequency of drains, discussion of 92 



Frozen ground, percolation of water through 31 



Grade, how computed 36 



locating, for open ditches 166 



uniform S6 



Grade of drain, change of. 87 



how expressed S5 



Grading ditches, line method 103 



target method , 105 



Guide-stakes, lining and setting 72 



material for. 71 



numbering 73 



Gumbo....,,.. , 17 



Hand-axe.. 55 



Hard-pan i8 



Health, effect of drainage on , 9 



Indiana Bureati of Statistics, report of 9 



Inspection of ditches 176 



Investment, profit on aij 



Junction of a shallow ditch with a deep one , 177 



Junctions with drains, how made. 108, 14 8 



King, F. H 40, 214 



Land drainage, kinds of • 35 



questions concerning 36 



Landowners should know drainage principles. 10 



Laterals, avoid short , 49 



location of , 48 



size of 144 



velocity of flow in , 145 



lettering, for maps. loi 



free-hand , loi 



Level line ..-......, *. * . . . 52 



i.^(ev6i.iingf uenniLion ...•«.*•..■....•••.*.••.««••••••••..*.... 5 



Level notes, form of. • . • , 58 



how to prove. ..,.....,., 5^ 



