. Principles of irrigation engineering, arid lands, water supply, storage works, dams, canals, water rights and products. ansas, westerly to the Pacific Coast,in southern California, and to the Cascade Ranges of northernCalifornia, Oregon and Washington. To the west of these, thehumidity is great and it thus happens that in the state of Washing-ton there is extreme aridity on the east of the mountains and equallyextreme humidity to the west of them. 8 IRRIGABLE LANDS 9 As before stated, there are scattered through this vast arid regionconsiderable areas of relatively humid mountain masses, esp
. Principles of irrigation engineering, arid lands, water supply, storage works, dams, canals, water rights and products. ansas, westerly to the Pacific Coast,in southern California, and to the Cascade Ranges of northernCalifornia, Oregon and Washington. To the west of these, thehumidity is great and it thus happens that in the state of Washing-ton there is extreme aridity on the east of the mountains and equallyextreme humidity to the west of them. 8 IRRIGABLE LANDS 9 As before stated, there are scattered through this vast arid regionconsiderable areas of relatively humid mountain masses, especiallyin northern portion of western Montana and in northern relative position and extent of the arid, semi-arid and humidregions of the United States are shown in Fig. 2. To the east of the truly arid region is a broad belt of country, severalhundred miles in width, with progressive decrease from the extremearidity of the high plains to the moderately humid conditions ofthe lands of the Mississippi Valley. This broad belt is by no meansfixed, as in some seasons when the rainfall is deficient, the arid or. Fig. 2.—Map showing relative area and position of arid, semi-arid and humidregions of the United States. semi-arid conditions progress to the eastward and again retreatwith the non-periodic fluctuations or successions of wetter there is a broad belt of country of which western Kansas istjrpical, having a soil of exceptional fertility, one which has notbeen washed by the rains, but which has alternately a climate toodry for successful production of ordinary crops, followed by years ofconditions highly favorable for profitable agriculture. These arethe conditions which lead to what is sometimes known as the famineregions of the world, where the richness of the soil tempts agricul-ture, and where successive years of moderate precipitation en-courages the development of population to be followed by dry yearswith resulting poverty and suffering. 10 PRINCI
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectirrigat, bookyear1913
