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Purchased by the U. S. Deparimenf of Agriculture

March, lfe

r

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13fficiat

5145

IR 1

Journal of the

IRRIGATION AND DRAINAGE DIVISION

Proceedings of the American Society of Civil Engineers

EVALUATING IRRIGATION EFFICIENCY 1 By

Marvin E. Jensen,' M. ASCE

INTRODUCTION

Irrigated agriculture

is

and has been the largest user of fresh water, but

it also has been accused of being an inefficient and uneconomical user. A major

part of the water used by irrigated agriculture is vaporized

(evapotranspira-tion), in contrast to other uses that do not "consume" water. Evapotranspiration

is largely controlled by meteorological conditions when adequate water is

pro-vided, and a full crop canopy exists. Significant reductions in

evapotranspira-tion, without corresponding yield reductions, on the bulk of the 44,000,000 acres

of irrigated land in the United States is possible, but is not economically

feasible now (in 1967), or inthe near future. In contrast, significant reductions

in canal seepage, deep percolation, runoff, and operational wastes may be

economically feasible now.

The agricultural industry has, during the past two decades, increased its

efficiency of producing food and fiber per unit of water vaporized by using

bet-ter crop varieties, insect control, improved irrigation and agronomic

prac-tices, and inorganic fertilizers. Further increases are possible and are being

developed through research, but additional increases are not expected to be

proportionally as great

as

those that have occurred during the past quarter

century (since the 1940's).

Improvements in the efficiency of the physical control of irrigation water

have been evident, but these improvements often are not

as

easily put into

effect

as

merely changing the crop variety, or applying fertilizer. For

ex-ample, a reduction in canal seepage may require large expenditures of money

and major construction programs. Similarly, an increase in the irrigation

Note.—Discussion open until August 1, 1967. To extend the closing date one month, a written request must be filed with the Executive Secretary, ASCE. This paper is part of the copyrighted Journal of the Irrigation and Drainage Division, Proceedings of the American Society of Civil Engineers, Vol. 93, No. IR1, March, 1967. Manuscript was submitted for review for possible publication on July 20, 1966.

a Contribution from the Northwest Branch, Soil and Water Conservation Research Dlv., Agric. Research Service, U. S. Dept. of Agric., in cooperation with the Idaho Agric. Experiment Sta.

'Research Investigations Leader, Water Mgt., Northwest Branch, Snake River Con-servation Research Center, Kimberly, Idaho.

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