Reconnaissance-Level Water Action Plan

• Description: for the Governance Committee of the Cooperative Agreement for Platte River Research ‎(aka Platte River Recovery Implementation Program or PRRIP)‎
• State: CO
• State: NE
• State: WY
• Basin: South Platte
• Water Division: 1
• Date: 9/14/2000
• Author: Boyle Engineering Corporation in association with BBC Research & Consulting andAnderson Consulting Engineers
• Title: Platte River Research Cooperative Agreement Reconnaissance-Level Water Action Plan
• Water Supply Pro - Doc Type: Report/Study

The following table shows the average monthly reductions in consumptive use for the
1975 -94 period.
Table III -10
Conservation Cropping — Reductions in Consumptive Use (ac -ft)
Month
Reach 16
Reach 17
Reach 18
Reach 19
October
0
0
0
0
November
0
0
0
0
December
0
0
0
0
January
0
0
0
0
February
0
0
0
0
March
0
0
0
0
April
6
10
8
5
May
12
25
20
-11
June
133
277
351
426
July
326
801
1052
1221
August
300
646
852
1052
September
23
45
48
43
Annual
799
1804
2330
2758
Based on the water budget spreadsheet, a reduction in consumptive use of 7,700 ac -ft
resulted in a yield of 7,000 ac -ft.of shortage reductions at the critical habitat without
diversion losses. In this case, it is important to note that flows in the critical habitat will
only be increased by reductions in consumptive use. Therefore, the reduction in
diversions is considerably higher to account for historic return flows. The modeling
being performed by the EIS team may indicate that the yield associated with 7,700 ac -ft
of consumptive use savings is higher or lower than 7,000 ac -ft of reductions to target
flow shortages. If the EIS modeling indicates a yield that differs from 7,000 ac -ft at the
critical habitat, the size of the water management program may require adjustment. This
applies to all water management options evaluated.
Option 2: Deficit Irrigation Practices
A deficit irrigation program would focus on reducing water use in irrigated corn
production. The representative deficit irrigation program would reduce irrigation on corn
acres by six inches per year. The distribution of land involved in deficit irrigation in each
reach was based on the distribution of acres irrigated with surface supplies. The number
of acres that were assumed to be included in a deficit irrigation program are summarized
in the following table.
Table III -11
Deficit Irrigation Program
Reach
Acres Included in
Program (ac)
16
2,000
17
4,300
18
5,500
19
4,700
Total
16,500
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