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Last modified
4/17/2013 9:38:02 AM
Creation date
5/27/2008 11:42:45 AM
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Decision Support Systems
Title
SPDSS Task 71 - Estimate Historical Acreage
Description
This memorandum presents the general approach and results from the completion of the following: Determine an appropriate method for using agricultural statistics, water rights, water availability, and other data to estimate historic irrigated acreage and crop types by ditch or other water source for the entire SPDSS study period (e.g. time periods before and between GIS irrigated acreage coverages).
Decision Support - Doc Type
Task Memorandum
Date
3/21/2007
DSS Category
Consumptive Use
DSS
South Platte
Basin
South Platte
Contract/PO #
C153954
Grant Type
Non-Reimbursable
Bill Number
SB01-157, HB02-1152, SB03-110, HB04-1221, SB05-084, HB06-1313, SB07-122
Prepared By
Leonard Rice Engineering
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SPDSS_Task71_EstimateHistoricalAcreage
Last modified:
4/17/2013 9:38:02 AM
Path:
\Decision Support Systems\DayForward
Comments:
2007 Revision
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acres in 1956 and 1976 but dropped to 175 acres in 1987 and to 157 acres in 2001 as <br />parcels portions of the ditch were transferred to municipal use. <br />In Figure 10, the junior Reese Stiles Ditch (WDID 0500519) went from 100% pasture in <br />1976 to 28% pasture and 72% alfalfa in 1987 back to 100% pasture in 2001. The total <br />acreage under this ditch remained constant at 29 acres until 2001 when it dropped to 9 <br />acres. User-supplied acreage reported annually in HydroBase indicates acreage under <br />this ditch has both increased and decreased several times over the last 20 years, even <br />though water rights have not been transferred. <br />During this same time period, the junior Harris Ditch (WDID 0600611) went from 40% <br />alfalfa, 55% pasture, and 5% small grains in 1976 to 28% alfalfa, 62% corn, 5% dry <br />beans, and 5% pasture in 1987 to 28% alfalfa, 25% pasture, and 47% small grains in <br />2001. The total acreage under this ditch stayed relatively consistent at 59 acres in 1956 <br />and 1976 and 56 acres in 1987 and 2001. <br />Figure 9. Crop Type Changes Over Time for Representative Senior Ditches <br />Boulder County Senior Ditch Crop/Acreage Comparison <br />90000 ^ 100% <br />80000 ® O 90% <br />70000 80% <br />® 70% <br />60000 <br />0 <br />50000 60 /o <br />50% <br />40000 <br />40% <br />30000 ^ 30% <br />20000 - _~ 's _ 20% <br />-.__ .,,. <br />10000 ~ _,~_ _^ ~- 10% <br />0 ~` -_ _ 0% <br />Ag Stat Corn Ag Stat Grains Ag Stat Alfalfa <br />Ag Stat Beans Ag Stat Sugarbeets Ag Stat Pasture <br />Ag Stat Total GIS Alfalfa-0600536 ^ GIS Pasture-0600536 <br />o GIS Alfalfa-0500546 s GIS Pasture-0500546 ^ GIS Corn-0500546 <br />® GIS Grains-0500546 <br />Page 7 of 11 <br />
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