Imperial Valley settlers' crop manual . 0 0 0 0 0 0 0 1903 0 0 0 0 T 0 1904 T 0 0 T 0 1905 0 0 T T T 0 0 1906 T T 0 0 1907 0 0 0 T 0 0 0 1908 T 0 0 0 0 0 Av. 0 0 BULLETIN 210. IMPERIAL VALLEY SETTLERS CROP MANUAL. 147 But not only has the Imperial Valley in common with other partsof the arid southwest, t
Imperial Valley settlers' crop manual . 0 0 0 0 0 0 0 1903 0 0 0 0 T 0 1904 T 0 0 T 0 1905 0 0 T T T 0 0 1906 T T 0 0 1907 0 0 0 T 0 0 0 1908 T 0 0 0 0 0 Av. 0 0 BULLETIN 210. IMPERIAL VALLEY SETTLERS CROP MANUAL. 147 But not only has the Imperial Valley in common with other partsof the arid southwest, the lowest rainfall and lowest relative hu-midity, but it also has a greater amount of sunshine and a greaternumber of clear days in the year than any other area on the E. F. Chumard, located two miles east of Heber, has furnishedthe Weather Bureau the following record of clear and cloudy days. Sunshine Eecord in Days at Heber, Gal. Year Clear Partly Cloudy Cloudy 1906 290 38 37 1907 302 42 21 1908 308 37 20 1909 315 23 27. Fig. 4.—Cracking of new-formed soil in ditch bottom. SOILS OF THE IMPERIAL VALLEY. In general, the Imperial Valley is a constructional depressioncaused by the subsidence of a number of faulted Erosionplayed no part in its formation, as can be readily seen from the factthat the bed of the valley is far below sea level and therefore belowany possible erosive action. At the time of this subsidence an arm ofthe ocean filled the valley thus formed, extending probably 200 milesnorth to San Gorgonio Pass. The Colorado River emptying into thisgulf rapidly formed a massive delta which gradually reached acrossthe gulf, coalescing with the small amount of aluvium and talus from i U. S. G. S. Water Supply Paper No. 225, by W. C. Mendenhall. 148 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. the peninsula range. The river at that time probaliy carried as muchmaterial as at present, which, according- to calculations by Forbes,would in one year cover
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
