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<br /> <br />Drainage <br /> <br />2. Drainage systems will be required by 2020 on <br />about 5 million acres of the 16.8 million acres <br />that will be under irrigation then. <br />3. The total cost of constructing the project-type <br />drainage systems (excluding the San Joaquin <br />Valley master drain in California) is estimated <br />at about $540 million by 2020. Annual <br />operation and maintenance costs are expected <br />to increase from $2.8 million in 1980 to $7.4 <br />million in 2020. <br />4. The San Joaquin Valley master drain is <br />estimated to cost about $200 million. <br /> <br />600 <br /> <br />100 <br /> <br /> <br />500 <br /> <br />~ PACIFIC SOUTHWEST <br /><t <br />.J 400 <br />.J <br />o <br />o <br />15 300 <br />'" <br />z <br />o <br />:i 200 <br />.J <br />i <br /> <br />o <br /> <br />GREAT BASIN <br />LOWER COLORAOO <br />UPPER COLORADO <br />1965 1980 2000 2020 <br /> <br />Figure 14.-Drainage installation costs. <br /> <br />52 <br /> <br />10 <br /> <br /> <br />9 <br /> <br />8 <br /> <br />7 <br /> <br /> <br />'" <br />II: <br /><t 6 <br />.J <br />.J <br />g PACIFIC SOUTHWEST <br />15 5 <br />'" <br />z <br />o <br />::; 4 <br />.J <br />i <br /> <br />3 <br /> <br /> <br />2 <br /> <br />o <br /> <br />1965 <br /> <br />Figure IS.-Drainage annual operation and mainte- <br />nance costs. <br />