WSP00530

• File Number: 8142
• Description: Trinidad Reservoir
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 4/1/1961
• Author: US DoI BoR
• Title: Special Report on Irrigation Function Trinidad Project Colorado
• Water Supply Pro - Doc Type: Report/Study

Trinidad mean maximum temperature
for period of record. . . . .
Hoehne mean maximum temperature
for period of record. . . . .

66.50 F.
67.90 F.

301*

.

CHAPl'ER 3. --WATER REQUIREMENTS

Consumptive use

Crop consumptive use requirement for lands under the Trinidad

Reservoir Project was computed by the Lowry-Johnson ~/ method. This

method is based on a relationship between consumptive use and effec-

tive heat. The length of growing season was detezmined from da11y

minimum temperature data. The daily excess of maximum temperatures
above 320 F. was tabulated for the period between the beginning and

end of the growing seaSon to obtain annual effective heat units.

Annual heat units obtained for the 1925-1957 study periOd

were applied to the Lowry-Johnson curve of the relationship between

consumptive use and effective heat to obtain the corresponding

annual consumptive use requirement.

.

Temperature records at the Trinidad C .A.A. Airport near

HOehne, Colorado were used as representative of the project area

for the period 1949 to 1957. Trinidad temperature records were used

for the 1925-1948 period and the annual heat units were corrected to

the Hoehne area by comparison of maximum temperature data from a
U. S. Weather Bureau publication, "Cliniatological Summary of the

United States--Supplement for 1931 through 1952". This summary
includes the period from establishment of station through 1952.

Trinidad annual heat units were corrected to the Koehne area by a

correction factor of 102 percent. The basis for this as follows:

.

Y Lowry, Robert L., and Johnson, Arthur F. - APril 1941.
Consumptive Use of Water for Agriculture, Proc. A.S.C.E. ( pp 595-
616) .

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