WSP10689

• File Number: 8273.600
• Description: Colorado River Basin Salinity Control - Federal Agencies - USDA
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/1994
• Author: USDA
• Title: Grand Valley Salinity Project - 1993 Annual Monitoring and Evaluation Report
• Water Supply Pro - Doc Type: Annual Report

3. Irrigation Monitoring AnIS Evaluation
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~.'~~: Summary Of The Monitoring site Data
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Approximately 377 acres were monitored in 1993. This acreage
accounts for only a very small portion (less than 1%) of the total
acreage in the Grand Valley. The table below shows irrigated crop
acreage for Mesa County which includes the Grand Valley and High
Country. The acreage monitored for irrigation in 1993 is also
provided. Refer to Appendix B for information on Mesa County
agricultural acreage and other statistics.

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crops Total Monitored Percent
Monitored l'.creaqe l'.cres Monitored
Corn (grain) 7,500 123 1. 64
Corn (silage) 9,800 25 0.26
Alfalfa n;300 173 0.54
Dry beans -, i,600 23 'It 1.44 i.
Soybeans . -1,000 8 0.80
Orchard (aooles/oeachesl 7.500 25 0.33

The average monitored sit~for 1993 was 17 acres. The 22 monitored
sites were established in~even soil types, five irrigation systems
and five crops. Crops mo~itored included alfalfa, corn (grain and
silage) ,'beans, soybeans, and orchard.

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A total of 180 irrigation;events were roonitored in 1993 of which
162 events provided useable- data. The results of _these 162
irrigation events collectea from the 22 sites are shown in Table 2
as the 1993 Annual Summary. The Table provides the annual summary
of each monitored site. Irrigation data from individual sites are
presented as site summary data in Appendix D.. site summary data
. from each monitored site~s' compiled and presented in Table 2. The
'. annual irrigation summary~rorthe 22 sites in Table 2 as well as
other tables, also includ~~data from surge/conventional side-by-
side comparison sites to e~timate the overall average for the Grand
Valley. Data from comparison sites are discussed in detail under
section II d., "Surge and- Conventional Irrigation Comparis'on".

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Table 2 as an

The 1993 irrigation monitoring site data presented in
Annual Summary indicate the following:

1. The average amount of water applied to the field was5l~9 acre
inches per acre, about 4.5 inches less than in 1992. When'
separated by surface and sprinkler systems, water application was
53.8 acre inches for the surface systems and 33.4 acre inches for

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