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The requirements for the Albuquerque area served, including undeveloped areas, in 1954 amounted to 0.8 acre-feet per acre per year. The requirements for the Santa Fe area served, including only the estimated developed area served, was 1.0 acre-feet per acre per year. Table No.2 also shows the estimated consumptive use of water for various cities. "Consumptive use" has been defined by the A.S.C.E. Special Committee on brigation Hydraulics as "The quantity of water transpired and evaporated from a cropped area". The equivalent of this definition as applied to an area served with domestic water, would be that quantity of water transpired or evaporated from the area served. By a study of sewage flows and winter water re- quirements, when city irrigation is at a minimum, it has been determined that approximately one-third of the total water used in the average city in arid areas goes into consumptive use. The remaining two- thirds of the water used is returned in the form of sewage effluent, treated or untreated, and serves to increase the stream flow, recharge the underground supply, or to furnish irrigation water directly. The average consumptive use of water for the cities included in Table No. 2 is shown to be 0.5 acre-feet per acre per year. Data on the consumptive use of water for agriculH tural purposes in the Rio Grande Valley area is shown in Table No.3. The average consumptive use in this area, for the periods reported, is 2.64 acre- feet per acre per year. Data on the water used for agricultural irrigation in the Salt River Valley, near Phoenix, Arizona, is shown in Table No.4. The average apportionment of stored water over the past 15 years is 2.9 acre-feet per acre per year. In addition to this quantity an estimated average of one acre-foot per acre per year from normal flow or pump rights was used, resulting in an average of 3.9 acre-feet per acre per year applied to the land. It has been estimated that ap- proximately 3.4 acre-feet per acre per year went for consumptive use. The expansion of southwestern cities into agricul- tural areas results in a decreased use of total water, or it results in a larger quantity of water being a- vailable for the remaining agricultural areas. These results are due to the much lower water require- ments per acre for cities than for farms. Compar- atively speaking, a city requires approximately one- half as much water per acre as agriculture requires. On a consumptive use basis, a city uses approx- imately one-fifth as much water per acre as is re- quited by agdculture. .. f;.~ .;'-1 PATTERN OF REQUIREMENT The patterns of water requirement for both mu- nicipal and agricultural purposes are shown on Plate No.5. It will be noted that these pattems for both municipal and agricultural use, such as the Salt River Valley, are very similar, varying from three to four percent of the yeady total in the month of Jan- uary to about twelve percent of the yeady total in the month of July. Municipal requirements in the area under discus- sion will vary throughout the year, and it is nec'es- sary to plan and build facilities to handle the max- imum requirements. The average requirement for the maximum month of the year will be approximately 160 percent of the average for the year, the max- ;',~ ~~:' [:,' ....: :-., ?~: [1 Table 3. Consumptive Use of Water for Agricultural Purposes Average Annual Consumptive Use Location Year AF/ Acre/Yr. f" ~>~ , Authority Isleta-Belen, N. Mex. 1936 Mesilla Valley, N. Mex. 1919 - 1935 Mesilla Valley, N. Mex. Carlsbad, N. Mex. Cadsbad, N. Mex. El Paso - Juarez Valley 2.8 2.73 2.75 2.51 2.33 3.25 2.64 117, p. 963. Blaney' Blaney' f~ ~;:; 1936 1921 - 1939 1940 1900 - 1948 Average Blaney' Blaney' Blaney' Lowryt *Blaney, Harry F., 1952, "Consumptive Use of Water," A.S.C.E. Transactions, Vol. t"Special Cases in Rio Grande Basin," 1952, A.S.C.E. Transactions, Vol. 117, p. 1016. 20 ~\' r.l -~....... U'J';;_~J