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The dry climate that provides the almost year-round growing season also can require heavily irrigated soils.

Alternatively, “colluvium” refers to the accumulation at the base of hills, brought there from runoff (as opposed to a water body).Rainfall is scarce in the desert region at less than three inches per year and groundwater is of little value.Alluvium generally refers to the clay, silt, sand and gravel that are deposited by a stream, creek or other water body.An acre foot of water equals about 326,000 gallons, or enough water to cover an acre of land 1-foot deep.To put it another way, an acre foot of water is enough to flood a football field 1-foot deep (a football field is roughly an acre in size).

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