WSP04649

• File Number: 8276.150
• Description: Grand Valley Unit-Colorado River Basin Salinity Control Project
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 2/1/1990
• Title: Draft 1989 Annual Report: Grand Valley Salinity Control Project Monitoring and Evaluation Program
• Water Supply Pro - Doc Type: Annual Report

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TABLE 3

GRAND VALLEY SALINITY CONTROL PROJECT
FIVE-YEAR SUMMARY OF IRRIGATION MONITORING DATA, 1985-1989

Year Field No. of Inflow Outf I ow I nf i It. ETa D.P. II I rr i g. <.1
size(aC> I rr '9. ( i n) ( i n) ( i n) (i n) ( i n) Eff i c. (%)
1985 20 8 63.1 16.8 46.3 24.2 27.7 30
1986 20 7 55.3 18.6 36.8 29.9 13.4 42
1987 19 7 53.5 16.1 37.4 30.1 12.6 46
1988 21 9 54.3 13.6 40.7 28.4 14.7 48
1989 21 9 52.9 14.4 38.5 27.5 12.3 49
l/D.P. is average deep percolation for all surface and sprinkler irr. sites
Z/Percen! irrig. Effie. = (inflow - outflow - D.P. / inflow) x 100

TABLE 4

GRAND VALLEY SALINITY CONTROL PROJECT
ACCEPTABLE AND ACTUAL DEEP PERCOLATION
FOR DIFFERENT CROPS, 1989

No. of
Crop Fields ETa(in.) Acceptable D.P.11 Actual D.P.21
Alfalfa 9 32.7 4.9 9.9
Beans 1 19.0 2.9 17.9
Corn31 " 19.4 2.9 29.0
"-
F. Grain31 2 18.9 2.8 25.8
Grapes 2 21.6 3.2 2.3
Orchard 3 29.5 4.4 4.3

1/ D.P. is average deep percolation in inches. Acceptable D.P. for leaching purposes for sal inity control is 15 percent.
2/ D.P. is average infi Itrated depth (net appl ication in inches) minus soi I water deficit at time of irrigation.
3/ One site cut for silage

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