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Sustainable Agriculture Literature Review - Boulder County

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Irrigated agriculture is the largest user of water in Colorado representing 80 percent of all<br />

surface and groundwater use, 220 a rate that is consistent with other regions nationally. 221<br />

Within the South Platte River Basin there are two main sources of water for irrigation and<br />

domestic water use in <strong>Boulder</strong> <strong>County</strong>: streams and storage reservoirs. The various<br />

streams in the South Platte River Basin include <strong>Boulder</strong> and South <strong>Boulder</strong> Creeks, and<br />

the Left Hand and St. Vrain Creeks. The storage reservoirs include Highland Reservoir<br />

No 2, Foothills Reservoir, Base Line Lake, Marshall Lake, and Left Hand Valley<br />

Reservoir. Figure 12 shows the main river basins in Colorado and their main tributaries.<br />

The Colorado Big Thompson Transmountain Diversion Project provides additional water<br />

to the Front Range from the Western Rockies, to help ensure a supply of late-season<br />

irrigation water during most years. 222<br />

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Figure 12: Major Geologic Regions and River Basins 223<br />

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