CRDSS_Task1_14-19_ImprovedEstimationIrrigatedAcres_GunnisonBasin

• Title: CRDSS Task 1.14-19 - Consumptive Use Model - Improvised Estimation of Irrigated Acreage in the Gunnison River Basin
• Description: This task memorandum documents the methods used to improve the estimation of crop-type acreage and distribution by county for all irrigated crops in the Gunnison River basin.
• Decision Support - Doc Type: Task Memorandum
• Date: 1/9/1995
• DSS Category: Consumptive Use
• DSS: Colorado River
• Basin: Gunnison
• Contract/PO #: C153658, C153727, C153752
• Grant Type: Non-Reimbursable
• Bill Number: SB92-87, HB93-1273, SB94-029, HB95-1155, SB96-153, HB97-008
• Prepared By: Riverside Technology inc.

TABLE 6
CROP ACREAGES USING METHOD 2
ESTIMATED 1985
COUNTY CROPS TYPE GIS GIS 1993 ACREAGECROPS TYPE CAS 198 5 ACREAGE
Delta Alfalfa 1111 Alfalfa 4582
14020002 Pasture 6421 Pasture 1110
Orchard 9 Orchard 0
Small Grain 238 Small Grain 487
Total HU2 7779 Total HU2 6180
Delta Alfalfa 2903 Alfalfa 11973
14020004 Corn 194 Corn 348
Pasture 25668 Pasture 4439
Orchard 2475 Orchard 0
Small Grain 728 Small Grain 1489
Tree Farm 47 Tree Farm 0
Vegetables 3 Vegetables 0
Total HU4 32018 Total HU4 18249
Delta Alfalfa 6211 Alfalfa 25617
14020005 Beans 990 Beans 1954
Corn 6220 Corn 11143
Pasture 16964 Pasture 2934
Orchard 2870 Orchard 0
Small Grain 1979 Small Grain 4048
Tree Farm 180 Tree Farm 0
Vegetables 1058 Vegetables 0
Total HU5 36472 Total HU5 45696
Delta Alfalfa 624 Alfalfa 2574
14020006 Beans 1055 Beans 2082
Corn 1618 Corn 2899
Pasture 666 Pasture 115
Orchard 54 Orchard 0
Small Grain 143 Small Grain 293
Vegetables 642 Vegetables 0
Total HU6 4160 Total HU6 7962
Delta Total81071Delta Total78088
Notes for method 2 :
? Some of the crops type and acreage in the estimated county statistics are not shown because they are listed in
the GIS only.
? HU2, HU4, HU5, and HU6 are the hydrological units in Delta County.
? GIS 1993 Total County Alfalfa Acreage
? The CAS total irrigated acreages in Delta County for 1993 and 1985 are 46,200 and 44,500 acres, respectively.
? Correction Factor = GIS TOTAL Acres(81071)/County Statistic (46200) 1993=1.7547835.
? Estimated Total County For 1985 = Cor. Factor * Total County Statistic Acres 1985.
? Estimated Total County For 1985 = (1.75478 * 44500 ) = 78088 Acres.
? Estimated County Alfalfa Total Acres For 1985= Cor. Factor * (CAS 1985 Total Alfalfa acreage).
? Estimated Total County Alfalfa Total Acres For 1985 = 1.7547835*25500 =44747 Acres.
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A 275 01.09.95 1.14-19 Al-azzawe