xxii LIST OF ILLUSTRATIONS 



FIG. v Page 



34. A permanent ditch in an orange grove 196 



35. Plan of field-ditch irrigation 197 



36. Flooding from ditches running down the steepest slope 198 



37. Flooding from field ditch 198 



38. Flooding with aid of canvas dam " 199 



39. Laterals made in field and dammed with small piles of manure 



for next year's irrigation 200 



40. Plan for border irrigation 201 



41. Border method of irrigation 202 



42. Irrigating cherries under check system 203 



43. Rectangular check method of irrigation 204 



44. Contour check method of irrigation 205 



45. Filling checks with detachable pipes. 206 



46. Orchard irrigation by basin method 207 



47. Orchard irrigation by basin method 207 



48. Grading of interior of basins to prevent water from coming in 



contact with trees 208 



49. Furrow irrigation 208 



50. Furrow irrigation of young alfalfa 209 



51. One-way furrow irrigation 210 



52. Furrowing land 211 



53. Standpipe supplying furrows with water 212 



54. Zigzag furrows to insure uniform distribution over soil 213 



55. Another type of zigzag furrows 214 



56. Lath-box for distributing water to furrows from head ditch. . . . 214 



57. Yield of crops due to rainfall 235 



58. Irrigating wheat 244 



59. Canvas dam to check water 245 



60. Irrigated wheat 249 



61. Irrigated oats 251 



62. Plan of rice irrigation 254 



63. Yield vs. water (wheat) 256 



64. Producing power of 30 acre-inches 257 



65. Yield vs. water (corn) 261 



66. Irrigated corn in Arizona 262 



67. Plan of irrigating an alfalfa field 270 



68. Temporary county fair building constructed of baled alfalfa hay 271 



69. An alfalfa field in Nevada 272 



70. Yield vs. water (alfalfa) 276 



71. Flooding pasture land 280 



72. Irrigating young alfalfa 281 



73. Irrigated cane in Kansas 283 



74. A sugar beet field 287 



