PROJ00479

• Contract/PO #: C153472
• Contractor Name: San Miguel Water Conservancy District
• Water District: 0
• County: San Miguel
• Bill Number: XB 99-999
• Loan Projects - Doc Type: Feasibility Study

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To investigate alternatives for increasing the late season water supply for the study area, it was
necessary to determine the availability of water for an irrigation project and the crop water
demands to be served, Water availability was determined through hydrological analyses of
water rights and historical streamflows, Water demands were determined through analyses of
cropping patterns, irrigation delivery and application methods, and municipal and industrial
demands, A basic premise of the study was that the conditional San Miguel Project water rights
held by the SMWCD could be used to develop additional water supplies for any of the
proposed alternatives,

The alternative projects formulated in the study are based on providing a reliable water supply
under project conditions to as much of the irrigated areas as practicable with the distribution of
crops indicated in Table 1, For this study a reliable supply was defined as the full season
irrigation water demand that could be supplied in eight out of ten years and is referred to as the
"80 percent reliable yield', Based on this criterion, reliable water supplies would be provided for
alfalfa, spring grains, silage corn, and a portion of the grass hay-pasture, while excess water
supplies in some years would be utilized for marginally-irrigated grass hay/pasture,

TABLE 1
IRRIGATED AREAS AND CROPPING PATTERNS INVESTIGATED
UNDER PROJECT CONDITIONS

Norwood-Redvale East Lilylands Dry Creek Basin
Service Area Service Area Service Area
Crop Crop Crop
CroD Acres ~ Acres ~ Acres ~
Grass Hay/Pasture 6,790 55 200 55 590 50
Alfalfa 3,710 30 110 30 350 30
Spring Grains 1,240 10 50 15 120 10
Silage Corn 620 ~ ~ ~ ....J.gQ -1Q
TOTALS 12,360 100 360 100 1,180 100

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