WSP02108

• File Number: 8273.600
• Description: Colorado River Basin Salinity Control - Federal Agencies - USDA
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/1996
• Author: Draper
• Title: Colorado River Salinity Control Program - McElmo Creek Unit - Monitoring and Evaluation
• Water Supply Pro - Doc Type: Report/Study

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C, Summary

Table 3. Displays the annual summary of the
monitored sites. A description of each column is
given below.

Column Description
(I) Site ID Code.
(2) Type of crops.
(3) Number of acres,
(4) Irrigation water applied by the system.
(5) Irrigation water applied less 10% (' .9)
(This is due to evaporation before the
water hits the ground.)

(6) RainfalL
(7) Total water that infiltrated the soil
(8) Change in soil moisture.
(9) Potential ET needed for crop growth.
(10) Actual ET based on soil moisture, total
water, and potential ET.
(I I) Deep percolation
(12) Irrigation efficiency: Ratio of water
used to the total water applied.
Columns {[ (10) - (6) + (8)]/ (4) }
(13) ET percent: Ratio of water applied to
water needed. When this number is
greater than 100, the crop received
excess water. Columns [(9) / (4)]
Note: These figures are a summary of weekly
values and are calcuIaled to 0.0 I the displayed
vallle~ are rounded to 0 I

Table 3 Summary of Monilored Slle. y-- <;~
\0-1
IMPROVED IRRIGATION SYSTEMS
10 CODE CROP ACRE IN IN RAIN TOT SOIL ETp ETa ET
'.9 IN ClING %
CRlZ-IPN ALF 48.5 36.5 32.9 3.7 36.6 -3.1 28.5 28.5 11.2 59.2 128.3
CRlZ-IPS ALF 59.4 38.0 342 3.7 38.0 .2.9 27.3 27.3 13.5 54.5 139.3
CRTZ-DS ALF 52.5 34.0 30,6 3.7 34.4 0.5 29.9 29.9 4.0 78.3 114.0
CRTZ.VK ALFIPAST 27.9 34.8 31.3 3.7 35.0 Ll 26.0 26.0 7.9 67.2 133.9
TOTAL 24\.9
A WRAGE 4&4 312 28 I 17 118 .2 :') 269 269 7-l 6Q 9 1139

Overall, when an improved irrigation system was
installed, the data illustrates that the system
hardware met or exceeded NRCS specifications
for design and efficiency. This can be attributed
to:

. The cooperator had received sufficient
irrigation water management training
resulting in proper management of the
irrigation system.

. The irrigation system had been designed with
"built in" system efficiencies.

. The farmer did not receive enough water to
over irrigate.

With the abundant water supply this year it
appears that the project is meeting its goals.

McElmo Creek Unit M&E 1995 Report
Page 6