LIST OF ILLUSTRATIONS IX 



Figures Page 



1 2.0 Floating dredge 223 



121 Open ditch showing slope of banks 224 



122 Proper form of surface ditch where earth is firm 224 



123 Ditch made with capstan ditching plow 224 



124 Angle of repose where ditch banks have caved in 225 



125 Ditch in a soil which caves in easily from washing. ... 225 



126 Ditch made with spade through peaty soil 225 



127 Narrow, deep ditch with braced poles protecting the 



sides from washing 226 



128 Plat of pond draining into drainage well 226 



129 Cross section of tiled pond discharging into drainage well 



beside pond 227 



130 Vertical outlet for tile drains through impervious stratum 227 



131 Drains constructed of field stones 228 



132 Drains constructed of boards 228 



133 Longitudinal section of a pole drain in peaty land. ... 229 



134 Cross section of a pole drain in peaty land 229 



135 Drainage pumping station 230 



136 Irrigation supply ditch carried across low areas and 



through land at grade 235 



137 Method of fluming water supply across low places. ... 235 



138 Windmill and storage reservoir for irrigation water. ... 236 



139 Portable steam pump for flooding rice fields 237 



140 Stationary steam pump for irrigation 240 



141 Flowing artesian well in Nebraska 242 



142 Raising water by hand in Egypt $ 244 



143 How irrigation and drainage systems can be installed on 



the same farm 246 



144 Supplying irrigation water by pumping 248 



145 Model of irrigation plant 249 



146 Trial survey line and adopted course for main irrigation 



canal 250 



147. Drop in irrigation ditch 251 



148 Division box in irrigation ditch 252 



149 Simple head gate for irrigation ditch 253 



1 50 Head gate or turnout for regulating and measuring water 



to farmer's ditch 254 



151 Measuring weir 255 



1 52 Details of weir board 256 



1 53 Measuring weir 257 



154 Plank scraper for opening irrigation ditch 258 



155 Plank scraper in use 259 



156 Supply ditch as made with reversible road machine. . . . 260 



157 Ditch' for farm lateral made with ordinary stubble plow 260 



158 Biped leveling device 261 



159 Manner of using biped leveling device 262 



160 Detail of adjustable leg of biped leveling device 262 



161 Grade level of light planed boards 263 



162 Listing plow for making shallow ditches 263 



