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An acequia (Spanish: [aˈθekja]) or séquia (Valencian: [ˈsekia]) is a community-operated watercourse used in Spain and former Spanish colonies in the Americas for irrigation. Particularly in Spain, the Andes, northern Mexico, and the modern-day American Southwest, acequias are usually historically engineered canals that carry snow runoff or river water to distant fields.
The Spanish word acequia (and Valencian séquia) comes from Classical Arabic "as-sāqiya", which has the double entendre of "the water conduit" or "one that bears water" and the "barmaid". The Arabs brought the technology to Spain during their occupation of the Iberian peninsula. The technology was adopted by the Spanish and utilized throughout their conquered lands, except in e.g. Mendoza, Argentina where acequias today run along both sides of all city streets but originally were dug all around by the indigenous Huarpes long before the arrival of the Spanish.
In the United States, the oldest acequias were established more than 400 years ago; many continue to provide a primary source of water for farming and ranching ventures in areas of the United States once occupied by Spain or Mexico including the region of northern New Mexico and south central Colorado known as the Upper Rio Grande watershed or Rio Arriba.
Acequias are gravity chutes, similar in concept to flumes. Some acequias are conveyed through pipes or aqueducts, of modern fabrication or decades or centuries old (see transvasement). The majority, however, are simple open ditches with dirt banks. In many communities, the ditchbanks are important routes for non-motorized travel.
Researchers affiliated with the Rio Grande Bioregions Project at The Colorado College initiated a pioneering collaborative, farmer-led, and interdisciplinary study of Colorado and New Mexico acequias in 1995-1999. Among the most significant findings of this study was that the acequia farms provide vital ecosystem and economic base services to the regions in which they are located. One study, as reported in Peña (2003), found that acequia agroecosystems promote soil conservation and soil formation, provide terrestrial wildlife habitat and movement corridors; protect water quality and fish habitat, promote the conservation of domesticated biodiversity of land race heirloom crops, and encourage the maintenance of a strong land and water ethic and sense of place, among other ecological and economic base values. This pioneering research on acequia ecosystem services, led by environmental anthropologist Devon G. Peña, has more recently been confirmed in studies led by the hydrologist Alexander Fernald and his colleagues(2007).
Known among water users simply as the Acequia, various legal entities embody the community associations, or acequia associations, that govern members' water usage, depending on local precedents and traditions. An acequia organization often must include commissioners and a majordomo who administers usage of water from a ditch, regulating which holders of water rights can release water to their fields on which days. In New Mexico, by state statute, acequias as registered bodies must have three commissioners and a majordomo. Irrigation and conservation districts typically have their own version of majordomos, usually referred to as "ditch riders" by members of the districts.
In recent years, acequias in New Mexico and Colorado have successfully developed and implemented changes in state water laws to accommodate the unique norms, customs, and practices of the acequia systems. The customary law of the acequia is older than and at variance with the Doctrine of Prior Appropriation, and the statutes promulgating acequia water law represent a rare instance of water pluralism in the context of Western water law in the United States (see Hicks and Peña 2003). For example, the Doctrine of Prior Appropriation is based on the principle of "first in use, first in right," while acequia norms incorporate not just priority but principles of equity and fairness. This is evident in the fact that Prior Appropriation considers water to be a commodity owned by private individuals while acequia systems treat water as a community resource that irrigators have a shared right to use, manage, and protect. While Prior doctrines allow for water to be sold away from the basin of origin, the acequia system prohibits the transference of water from the watershed in which it is situated and thus considers water as an "asset-in-place". The Prior regime is based on a governance regime in which the members of a mutual ditch company will vote based on their proportional ownership of shares so that larger farmers have more votes. In contrast, the acequia system follows a "one farmer, one vote" system that has led researchers to consider this a form of "water democracy" (see Rivera 1998; Peña 2003). Acequia water law also requires that all persons with irrigation rights participate in the annual maintenance of the community ditch including the annual spring time ditch cleanup known as the limpieza y saca de acequia.
See also 
- Fernald, A. G., T. T. Baker, and S. J. Guldan, Hydrological, Riparian, and Agroecosystem Functions of Traditional Acequia Irrigation Systems. Journal of Sustainable Agriculture 30:2:147-71.
- Thomas Glick. Irrigation and Society in Medieval Valencia. Cambridge, Mass: Harvard University Press, 1970. Spanish version: Regadío y sociedad en la Valencia medieval. Del Cenia al Segura. Valencia, 1988.
- Thomas Glick. The Old World Background of the Irrigation System of San Antonio, Texas. El Paso, Texas: Western Press, 1972. Spanish version, in Los cuadernos de Cauce 2000, No.15 (Madrid, 1988); also in Instituto de la Ingeniería de España, Obras hidráulicas prehispánicas y coloniales en América, I (Madrid, 1992), pp. 225–264.
- Gregory A. Hicks and Devon G. Peña. Community Acequias in Colorado's Rio Culebra Watershed: A Customary Commons in the Domain of Prior Appropriation. University of Colorado Law Review 74:387-486. 2003.
- Jose A. Rivera. Acequia Culture: Water, Land, and Community in the Southwest. Albuquerque: University of New Mexico Press. 1998.
- Devon G. Peña. The Watershed Commonwealth of the Upper Rio Grande. In: Natural Assets: Democratizing Environmental Ownership, eds. James K. Boyce and Barry G. Shelley. Washington, D.C.: Island Press, pp. 169-85. 2003.