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<br />20 <br /> <br />will be used each year for domestic requirements. A reserve of 50,000 acre-feet <br /> <br />is held in reservoir each month to meet domestic needs. <br /> <br />Water needs <br /> <br />The term "duty of water" has been used to denote the relation <br /> <br />between the quantity of irrigation water applied and the area irrigated. In recent <br /> <br />years there has been a tendency to replace the term by the term "water requirement" <br /> <br />or "irrigation requirement". Water requirement is used to mean the total quantity <br /> <br />of water per unit area needed to produce satisfactory crop yields, whether supplied <br /> <br />wholly by irrigation or by irrigation and rainfall combined. Irrigation require- <br /> <br />ment is used to mean the total quantity per unit area that must be applied artifi- <br /> <br />ciall,y, in addition to rainfall. The word "net" is used before either term to <br /> <br />mean that the quantity applies to farm areas and does not include conveyance losses <br /> <br />or waste. <br /> <br />Water requirements, including rainfall, of crops in Southwestern areas, have <br /> <br />been listed by Houk (in Davis, Handbook of Applied Itrdraulics; McGraw-Hill, 1952) as: <br /> <br />Beets (sugar)---- 1. 77 to 2.72 ac.ft./ac. Onions-------- 0.73 to 1.52 ac.ft./ac. <br />Cabbage---------- .94 " 1.49 " Peas---------- 1.21 " 1.56 " <br />Cauliflower------ 1.43 " 1.77 " Beans--------- .83 " 1.44 " <br />Carrots---------- 1.27 " 1.60 " Sorghum------- 1.69 " 2.08 " <br />Corn------------- 1.44 " 1.99 " Soybeans------ 1.66 " 2.81 " <br />Cotton----------- 2.35 " 3.51 " Sugar Cane---- 3.48 " 4.56 " <br />Kafir------------ 1.32 " 1.54 " Tomatoes------ .95 " 1.42 " <br />Lettuce---------- .72 " 1.35 " <br /> <br />Water requirements in Pacific Coast and in Missouri-Arkansas basins are given as: <br /> <br />Pacific Coast <br /> <br />Missouri-Arkansas <br /> <br />Oranges <br />Lemons <br />Avocados <br />Cotton <br /> <br />2.54 to <br />2.10 " <br />2.35 " <br />2.12 " <br /> <br />3.15 ac.ft./ac. <br />2.90 11 1f " <br />2.58" " <br />3.46 tI II <br /> <br />Cantaloupes <br />Tomatoes <br /> <br />1.50 to 2.30 ac.ft./ac. <br />2.10 If 2.80 "" " <br /> <br />" <br /> <br />" <br /> <br />Net irrigation requirements are given as: <br /> <br />West Central Texas----------------- 1.60 ac.ft./ac. <br />Pecos River basin------------------ 2.25 " " " <br />Upper Rio Grande basin (Texas)----- 2.40 "" " <br />lower Rio Grande Valley------------ 1. 75 "" " <br /> <br />"\ ;" _ r. ,', ': <br />V~'''...~\J <br />