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<br />. <br /> <br />. <br /> <br />. <br /> <br />no~~ng <br /> <br />CHAPTER II <br /> <br />BASES FOR ArMLYSIS <br /> <br />Acreage summaries <br /> <br />The lacd classifications show a total arable area of 430,000 acres, <br />including 113,OJO acres presently irrigated and 312,000 acres not irri- <br />gatec1_. A:~proxim9.tely 65 percent of the irrigated lands have an adequate <br />water supply and the remaining 35 percent eA~erience irrigation shvrtages <br />of varying degrees. _ <br /> <br />Of t~e total arable area, approximately 187,000 acres could ~e irri- <br />gated under the units of the Y~a-Vnite project as appraised in this <br />report. Approxir;;",tely 7,800 acres of the land serviceable now receive a <br />partial irrigation supply and the remaining 179,2JO acres are witho~t any <br />irrigation water. The lands serviceable by units of the project u.re sun- <br />marized in the table on the following page. <br /> <br />Soils <br /> <br />Moat of the agricultural lands of the YamjJP.-l-Ihite project area con- <br />tain both z..lluvj_al and residual. soils. The alluvial deposits, laid down <br />by intermittent and pere~ial streams, are found principally in the valleys <br />and the low terraces adjoining the valleys. The residual soils are gen- <br />erally found on the higher benches. The soils in the area vary in color <br />from light grayish brown to dark brown and in texture from sandy loam to <br />heavy clay. <br /> <br />Topography <br /> <br />The topography of the arable lands varies conSiderably over the proj- <br />ect area. The lends are found on terraces, fans, recent flood plain <br />bottoms, and on high benches above the stream valleys. For the most part, <br />the land areas ere dissected by natural drainageways that are generally <br />,lell spaced. <br /> <br />Drainage <br /> <br />The general soil and topographic conditions are favorable for the <br />maintenance of good internal and external drainage. In most areas the <br />excess water would mo\"e down and through the per:neable soil mantle into <br />nearby natural drainageways. In some large land bodies, however, excess <br />water would have to travel long distsnces to netw-al drainageways snd <br />thus drainaGe conditions are poor. Drainage conditions also are poor in <br />scattered areas with heavy-textured soils or wit~ shallow soil mantles <br />over barrier layers. Provision for artificial drainage is made for the <br />areas included in the unit plans that have poor natural drainage conditions. <br /> <br />12 <br />