WSP08610

• File Number: 8281.300
• Description: Colorado River Studies and Investigations - Colorado River Consumptive Uses and Losses Report
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 10/1/2003
• Author: US DOI/BOR
• Title: Technical Memorandum - Upper Colorado River Basin Consumptive Uses and Losses Report 1996-2000 -- Part 1 of 4
• Water Supply Pro - Doc Type: Report/Study

o
'-.:)
( ~~J

..
~
CJ'

150% or more. In this case the GIS acreage was still used as the accounted for
acreage, Further investigation into these discrepancies may be needed by the State of
Colorado.

.....,..
;;.,.:

The croplands had to be disaggregated into HUCs in order to be entered into the
XCONSVB crop water use estimation program. Basically the county wide GIS coverage
was used and broken into HUCs through a GIS clipping function. These values were
then used to determine a net percentage of each crop in each HUC. See tables 6 and 7
for a summary of the Delta County Colorado agricultural acreage, This total acreage
was then used for inputs into the model and crop consumptive use values were
determined.

Example Calculations:

Using Alfalfa and the three HUCs found in Delta County

GISacres
HUC% = *100
TotalAcresInCounty

HUC 12060003 example

22,237 acres /72,0186acres *100 = 82%

Alfalfa_Acre _ HVC = % * TotalAcreslnHuc

Alfalfa HUC 14020005 example:
2,230 acres * 68% = 21 ,580 acres of Alfalfa in 1996
6,877 acres * 68% = 22,444 acres of Alfalfa in 1997
6,877 acres * 68% = 22,238 acres of ~Ifalfa in 1 ~98 .
6,877 acres * 68% =='2'1 :826 acres of Alfalfa in 1999
6,877 acres * 68% = 21,888 acres of Alfalfa in 2000

4