Irrigation in Mexico

Irrigation in Mexico

Mexico has a total land area of 2 million square kilometres and it is classified as an arid and semi-arid country. The agricultural sector plays an important role in the economic development of the country accounting for 8.4 of agricultural gross domestic product (GDP) and employing 23% of the economically active population. Irrigated agriculture contributes about 50% of the total value of agricultural production and accounts for about 70% of agriculture exports. Mexico’s government initiated a number of structural reforms in the water sector aimed to introduce modern water management and irrigation.

Irrigation development

Irrigation infrastructure

Of the 6.2 million hectares (ha) with irrigation facilities in Mexico, about 4.2 million ha (67%) are irrigated with surface water, and the remaining, some 2 million ha (33%) are served by groundwater pumping. Approximately 3.3 million ha correspond to 80 bigger systems, namely irrigation districts (Distritos de Riego – DR). The remaining 2.9 million ha are distributed among more than 30 thousand small size communal and irrigation units (Unidades de Riego – UR).

The average plot size is relatively small, less than 1 ha is common, particularly in the irrigation units. At the same time, many landowners have farms larger than 50ha and family farms, combining individual land holdings, may surpass 500ha.

Irrigation infrastructure and irrigated area

"Source": FAO

The most important irrigation projects in Mexico are: Culiacán-Humaya-San Lorenzo Project, Yaqui River Project, Fuerte River Project, Colorado River Project, Lower Bravo River Project, Higher Lerma River Project, Lagunera Region Project, Guasave Project, Mayo River Project, Lazaro Cardenas Project, and Delicas Project. These projects range from some 250,000 hectares to around 80,000 hectares of irrigated area each one ref_harv|ICID|ICID|ICID.

Linkages with water resources

The mean annual rainfall of 777 mm results in a mean annual runoff of 410 km2, slightly more than 62 km3 of yearly renewable groundwater (including an estimate of 15 km2 of induced replenishment in the irrigation areas), and the remaining, some 1,060 km2, evaporates ref_harv|ICID|ICID|ICID. Most of the country experience in rainy season, from June to mid-October and significantly less rain during the remainder of the year. February and July generally are the driest and the wettest months, respectively. Less than a third of the runoff from precipitation occurs within 75% of the national territory, where most of the irrigated land is located ref_harv|World Bank|Tsur|Tsur.

In 1995, 61, 2 km3 were used for irrigation, 67% of which was supplied by superficial water, 33% from groundwater. Only 40 km3 were actually used, due to inefficiencies related with water canals and evapotranspiration ref_harv|Country Brief|FAO|FAO.

There are three main watersheds in Mexico: the Western or Pacific Watershed, the Eastern or Atlantic Watershed (Gulf of Mexico and Caribbean Sea) and the Inland Watershed, where rivers do not empty out into the sea. Two thirds of the country’s 146 rivers drain into the Pacific Ocean.

There are approximately 100 rivers in the Western or Pacific Watershed, the most important in terms of water flow being the Balsas, Colorado, Culliacan, Fuerte, Lerma-Santiago, Verde, and Yaqui Rivers.

The Eastern Watershed is made up of 46 main rivers, the most important being the Bravo, Coatzacoalcos, Grijalva, Panuco, Papaloapan and Usumacinta Rivers.

The Inland Watershed is made up of large closed basins. The Nazas-Aguanaval river system is the largest ref_harv|ICID|ICID|ICID.

Environmental impacts of irrigation

More than 22 km3 of waste water are discharged into Mexico’s water bodies. Agricultural use accounts for 50% of this volume, mainly in the form of nonpoint discharges with high levels or residues for pesticides, fertilizers, and other chemicals.

Vast expanses of southern and southeastern tropical forest have been denuded for cattle rising and agriculture. Deforestation has contributed to serious soil erosion nationwide. In 1985, the government classified almost 17% of all land as totally eroded, 31% in an accelerated state of erosion, and 38% showing signs of incipient erosion.

Soil destruction is particularly pronounces in the north and northwest, with more than 60% of land considered in a total or accelerated state of erosion. Fragmented because of its semiarid and arid character, the soil in this region has become increasingly damaged through excessive irrigation with waters high in salt. As a result, desertification is spreading throughout the region ref_harv|World Bank|Tsur|Tsur.

Ineffective irrigation has generated salinization and drainage problems in 384,163 ha in a total drained are of 5,203,346 ref_harv|Country Brief|FAO|FAO.

History of the irrigation sector

Agricultural land under irrigation/past and present trends

Irrigation development in Mexico has been traditionally affected by the Mexican revolution and the agrarian reform. At the beginning of the Revolution (1910), there were about 1.2 million ha if irrigated land. Much if this land had been developed by land companies, mainly American, to grow plantation crops such as sugar cane and cotton. After the creation of the National Irrigation Commission in 1926, the irrigated area quickly expanded, and the agricultural census reported a total of 4.3 million ha of irrigated land by 1960. By the late 1980s, Mexico had about 6 million ha under irrigation ref_harv|World Bank|Tsur|Tsur.

During the 1980s and 1990s, irrigation development slowed down due to the economic crisis. The irrigation sector focused then on optimizing the use of exiting infrastructure. In 1997, the total irrigated area accounted for 6, 2 million ha, 5, 4 million ha were actually irrigated. The northern states of Sinaloa and Sonora, account for 15% and 11% respectively of the total irrigated land ref_harv|Country Brief|FAO|FAO.

Institutional Development

Food production requirements and the need to settle vast unpopulated areas in the northern region bordering the United States triggered the creation of the National Irrigation Commission and the enactment of the Irrigation Act of 1926. Water use was then low, even regionally and locally, so planning was undertaken project by project. Land reform, a stepping stone of post-Revolutionary governments, was closely related to irrigation projects.

In 1946, The Ministry of Water Resources took place of the National Irrigation Commission and, for the first time, responsibility for water development was concentrated within the realm of a single ministry. Water use increased substantially as a result of the economic development policies, especially for the industrial sector.

During the 1940s and 1950s, River Basin Commissions were created to launch regional development programs sustained by water-related projects. In 1975, the first National Water Plan provided a framework for improving water resources management consistent with national and regional objectives. In 1976, the National Water Plan Commission was created to implement the plan and update it systematically. Also in 1976, the Ministries of Water Resources and Agriculture become the Ministry of Agriculture and Water Resources, mainly to unify governmental actions directed at solving the growing problems of the agricultural sectors. This institutional change however, caused a disintegration of water planning and managementref_harv|World Bank|Tsur|Tsur. The economic crisis of the 1980s led to drastic changes in Mexico’s irrigation policy. The National Development Plan (1989-1994) called for an increase in irrigation efficiency and the use of existent infrastructure. Under the National Program for Decentralization of Irrigation Districts, derived from the National Development Plan, Mexican government initiated the management transfer of irrigation districts to Water User Organizations (WUOs). The National Program, implemented by CONAGUA, originally planned the transfer of operation and maintenance of 21 irrigation districts, comprising 1.98million ha. To date, actual targets far exceed the target of 1.98 million ha of area during the 1990-1994 period ref_harv|World Bank|Gorriz|Gorriz.

Legal and institutional framework

Legal framework

In 1992, the Mexican government issued the renewed federal National Water Law (NWL), and the corresponding Regulations issued in 1994. These legal instruments, together with Mexican Constitution, are the main juridical basis for water and irrigation management in the country, and entitle the nation with the original property of practically all waters.

The NWL explicitly declares sustainable development as its primary objective. Furthermore, the last is consistent with Mexico’s initial efforts related to decentralization, water-user participation, efficient use of water, expanded participation of the private sector, and fiscal policies related to the collection water levies for both water use and water pollution control.

Institutional framework

The National Water Commission (Comision Nacional de Agua – CONAGUA) was created in 1989, as the National Water Authority an autonomous agency under the Ministry of Agriculture and Water Resources. CONAGUA should coordinate investments in the water, sector, setting priorities and constrains reflecting each river basin’s actual situation.

The Instituto Mexicano de Technologia del Agua (IMTA) was create din 1986 to foster the technological effort needed for a policy implementation, especially in relation to efficient use of water and conservation of water quality in every sector of water useref_harv|World Bank|Tsur|Tsur.

Officers from both Government agencies have close contact and relationships with the people managing the Irrigation Districts ref_harv|FAO|Alexander, 2002|Alexander, 2002.

At the crop level, three main groups of institutions have been assigned with responsibilities for WRM: the irrigation districts, the irrigation units, and small private irrigation schemes.

The irrigation districts, covering 3.4 million ha (or 53% of the irrigated area), are large-scale irrigation schemes supplied mainly with surface water and some with groundwater. The responsibility for their operation and maintenance has been transferred to water users associations (Asociaciones Civiles de Ususarios – WUAs) in the 1990s except for 5% of the area that is still operated by CONAGUA as well as some if the upstream infrastructure such as dams and large canals.

The irrigation units, covering about 2million ha (or 32% of the irrigated area), are smaller public irrigation schemes, supplied from both surface and groundwater and operated and maintained from their inception by agricultural producers.

Small private irrigation schemes, covering about 0.9million ha (15% pf the irrigation area) are supplied primarily from groundwater. Agricultural producers carry out O&Mref_harv|World Bank|Olson|Olson.

The National Federation of Users of Irrigation Water (Asociación Nacional de Usuarios de Riego), established in 1994, represents the interests of WUAs in negotiations with the Government.

Farmers/organizations and on-farm water management

Agricultural producers who are interested in organizing a common irrigation systems form Water User Associations (WUA). The 1992 National Water Law (Ley de Aguas Nacionales), and the implementing regulation of the 1004, Law on National Waters (Reglamento de la Ley de Aguas Nacionales) recognize WUAs as civil non-profit associations responsible for irrigation infrastructure management as well as management of Irrigation Districts and Irrigation Units. Despite the increasing role of agricultural producers, CONAGUA remains the sector’s dominant player in terms of policies, subsidies, programs and norms ref_harv|World Bank|Olson|Olson.

WUA consist of water users and its functions are the delivery of irrigation water and operation and maintenance of canals and dispute settlement. WUAs can also construct their own infrastructure or participate in government-financed construction projects. WUAs shall keep and update a register of members and their respective water rights.

WUAs can be granted water rights. In order to be granted water rights, WUAs must adopt an internal statute that indicates, among others: conditions for water distribution and management, internal organization of the WUA, rights and duties of members, provisions on financial management (income and expenditures), provisions for the transfer of water rights among members and provisions on dissolution of the WUA.

WUAs sources of income are revenues from the collection of service charges and membership dues ref_harv|Legislation|FAO|FAO.

Government strategy on the irrigation sector

The transfer of the biggest irrigation systems or irrigation districts (53% of total irrigated area) from federal government to water users associations (WUA's) is a key component of the new water policy (Ley de Aguas Nacionales, 1992).

Along with the transfer program, the government, supported by the [http://www.worldbank.org/ World Bank] and the Inter-American Development Bank invested in rehabilitation and improvement to irrigation and drainage systems and in operation and maintenance equipment that was transferred to the WUAs along with the systems. This has resulted in some improvement in operation and maintenance, WUAs financial sustainability and fewer conflicts between users.

Water tariff and cost recovery

Water tariff for irrigation fluctuate between the US$40 ha/year for irrigation systems supplied by surface water and 150-200 US$ ha/year for irrigation systems supplied by groundwater. Water tariffs had to cover both the cost of operation, administration and maintenance at the module level and the module’s share of costs at the main canal and water-source level.

Water charges are determined for each perimeter by the respective WUA. The tariff is to be calculated every year by dividing the estimated O&M budget by the amount of water authorized for each module. However, this would imply that water services are charged by volume. In fact, fees are assessed by total hectares, by irrigated hectares, by type of crop, and by cultivated area, and only in a few cases by volume. In most irrigation districts, users are required to pay for service in advance. Thus, most of the WUAs receive most of their income at the beginning of the irrigation circle. Even during drought and financial crisis, more that 90% of users paid water charges ref_harv|World Bank|Tsur|Tsur.

Cost recovery in the IDs contributes for 72% of O&M costs, which is considered low. Between 1998 and 2002, farmers covered more than 90% of the administration and O&M costs in 14 out of 82 IDs. In the other 68 IDs the cost recovery was lower ref_harv|World Bank|Olson|Olson.

Investment and financing

The overall expenditure in the water sector approached US$ 3.9 billion in 2004, or 0.5% of the GDP. Of this amount, the public sector spent over US$ 3.5 billion, which is close to 2.5 % of Mexico’s budget, while the private sector accounted for the rest. A significant share of resources spent in the sector, including both investment and recurrent expenditures, comes directly or indirectly from water users. CONAGUA accounts for 30% of total expenditures in the water sector.

From 2000 to 2005, CONAGUA invested US$1.28 million in the irrigation sector, or about 40%of the overall CONAGUA investments. Seventy percent of those investments were allocated to the IDs and 30% were allocated to the IUs. Most CONAGUA investments programs are co-financed with the States and farmers. For example, in 2005, the Irrigation and Drainage Program (Programa Sectorial de Riego y Drenaje), was financed at 50% by CONAGUA, 15%by the States and 35% by farmers and the On-farm Irrigation Development Program (Programa de Desarrollo Parcelario), at 56% by CONAGUA, 5% by the States and 39% by farmers ref_harv|World Bank|Olson|Olson.

Possible climate change impacts on irrigated agriculture

Mexico is prone to several weather events including hurricanes on both Pacific and Caribbean coasts. Hurricanes contribute to recharge surface and groundwater reservoirs with increases water supply for cities, irrigation and electricity generation. Hurricanes pose also a threat to service delivery, infrastructure and ultimately to ecosystems and human life. This situation is aggravated by deforestation upstream as well as human settlements located in flood prone areas ref_harv|Plan Nacional|CONAGUA|CONAGUA.

With more than 85% of the Mexican land area defined as arid or semi-arid and a highly variable inter annual rainfall Mexico is also prone to droughts, especially in the northern areas.The most severe droughts in Mexico in recent decades coincide with the variations in Pacific sea-surface temperatures associated with El Niño. The economic and social and environmental impacts of droughts in Mexico are notable. In 1996, four years of below normal rainfall produced farms losses estimated at US$1 billion and interstate political between Sonora and Sinaloa ref_harv|Oxford|Liverman|Liverman.

Climate change will produce a decrease in water flow and an increase on water demand due to increasing temperature, decreasing rainfall and more extreme weather conditions such as droughts and floods due to El Niño Southern Oscillation and La Niña.

The IPCC estimates an increase in temperatures between 1 and 6 degrees Celsius. By 2050, the Mexican Institute of Water Technology expects a 7-12 % decrease in precipitation in the southern basins, 3% in the Mexican Golf basin, and 11% in the central basing. Precipitation is estimated to continue decreasing over the next 50 years. A diminished river flow will also contribute to higher evapotranspiration. There is also expected to see an increase on 5 category hurricanes ref_harv|IMTA|Martinez| Martinez.

During some El Niño/La Niña years, winter precipitation may be so great that stream flow and water levels in dams may exceed those observed during summer. In contrast, summer droughts during these events can lead to serious deficits in reservoir levels and in rain-fed maize production. In Mexico during 1997, the estimated costs of climate anomalies associated with El Niño were 900 million US dollars, particularly in agricultural activities, when 2 million hectares (5million acres) were affected by a severe drought ref_harv|Universidad|Conde|Conde.

External cooperation

In 1993, the World Bank approved a US$303 million loan to support an [http://www-wds.worldbank.org/external/default/WDSContentServer/WDSP/IB/2003/11/18/000090341_20031118095759/Rendered/PDF/271740MX.pdf integrated irrigation modernization project] . This project, whose closing date is 2009, aims to assisting Mexico’s government in its efforts to adopting a new model to improve the competitiveness of irrigated agriculture and the efficiency of irrigation water use, in both DRs and URs, that would include the development of partnerships between the public and private sectors as well as effective institutional collaboration within the public sector, plus the strengthening of a demand-driven approach to investment decisions and financing.

In June 2007, the Inter-American Development Bank (IDB) approved US$150,000 for an examination of the distributional effects of water reforms. The project is currently being implemented. In September 2007 it approved a US$200,000 project to support a program to relief damages caused by Hurricane Dean.

Lessons learned from Mexico's model

The irrigation sub-sector of Mexican agriculture has been experiencing profound transformations, moving towards decentralization and market-oriented approaches in the management of irrigation water.

After the transfer, there is a steady pace of better maintenance in the majority of the irrigation districts. At present, most irrigation systems are operated and maintained by WUA's or farmers themselves, with only O&M of head works and some main canals of big systems remaining in the hands of CONAGUA. As the process of irrigation-management transfer advances is consolidated, the commission’s role will dismiss.

Parallel to decentralization, CONAGUA is promoting participatory processes in water management through the creation of river basin councils and regional offices conforming to hydrological boundariesref_harv|World Bank|Tsur|Tsur.

The new water law defined property rights over water and provided water users associations with clear rights, roles, functions and responsibilities. In addition, it was developed on already existing strong institutional and ideological basis for user representation in the new organizationsref_harv|World Bank|Olson|Olson.

The water markets that are emerging as a result of changes in the Mexican Water Law will bring about a reshaping of the irrigated agriculture sub-sector in the country ref_harv|FAO|Garces-Restrepo|Garces-Restrepo.

ee also

*Electricity sector in Mexico
*Water resources management in Mexico
*Water resources in Mexico
*Water supply and sanitation in Mexico
*List of countries by irrigated land area

Cited References


*note_label|FAO|Alexander, 2002|Alexander, 2002cite web
author=Alexander, Peter
title=Benchmarking the Irrigation and Drainage Sector in Mexico
work=International Program for Technology and Research in Irrigation and Drainage
url=ftp://ftp.fao.org/agl/iptrid/benchmark_mex_2.pdf
accessdate=March 21 |accessyear=2008

*note_label|Plan Nacional|CONAGUA|CONAGUAcite web
author=CONAGUA
title=National Water Program
work=SEMARNAT
url=http://www.agua.org.mx/images/stories/BibliotecaT/Leyes_y_normas/programa%20naciona%20h%EDdrico%202007%202012.doc
accessdate=March 13 |accessyear=2008

*note_label|Universidad|Conde|Condecite web
author=Conde, Patricia and Gay, Carlos
title=Impact of climate change and climate variability in Mexico
work=Acclimations
url=http://www.usgcrp.gov/usgcrp/Library/nationalassessment/newsletter/1999.10/Mexico.html
accessdate=March 13 |accessyear=2008

*note_label|Country Brief|FAO|FAOcite web
author=Food and Agriculture Organization
title=Country Profile: Mexico
work=Aquastats
url=http://www.fao.org/nr/water/aquastat/countries/mexico/indexesp.st
accessdate=March 19 |accessyear=2008

*note_label|Legislation|FAO|FAOcite web
author=Food and Agriculture Organization
title=WUA legislation country profiles: Mexico
work=FAO
url=http://193.43.36.103/ag/agl/aglw/waterinstitutions/docs/LegalCSMexico.pdf |accessdate=March 21 |accessyear=2008

*note_label|FAO|Garces-Restrepo|Garces-Restrepocite web
author=Garces-Restrepo, Carlos
title=Irrigation Management Transfer: Mexico
work=FAO
url=http://www.fao.org/AG/agl/aglw/waterinstitutions/docs/mexico.pdf
accessdate=March 21 |accessyear=2008

*note_label|World Bank|Gorriz et al.|Gorriz et al.cite web
author=Gorriz, Cecilia M., Subramanian, Ashok, and Simas, Jose. Douglas Olson (1995)
title=Irrigation Management Transfer in Mexico
work=World Bank
url=http://books.google.com/books?id=O1qUqqDpU1EC&dq=world+bank+irrigation+mexico&pg=PP1&ots=g1VzfxGr4I&source=citation&sig=urm6l11yMEMaORcrIwB0nq18uko&hl=en&prev=http://www.google.com/search?hl=en&q=world+bank+irrigation+mexico&sa=X&oi=print&ct=result&cd=1&cad=bottom-3results#PPP1,M1
accessdate=March 19 |accessyear=2008

*note_label|ICID|ICID|ICIDcite web
author=International Commission on Irrigation and Drainage
title=Country Profile Mexico
work=ICID
url=http://www.icid.org/cp_mexico.html
accessdate=March 19 |accessyear=2008

*note_label|Oxford|Liverman|Livermancite web
author=Liverman, Diana M.
title=Adaptation to Drought in Mexico
work=Oxford University Centre for the Environment
url=http://www.eci.ox.ac.uk/~dliverma/CV/Liverman%20paper%20from%20NRJ%20on%20Drought%20in%20Mexico.pdf
accessdate=March 13 |accessyear=2008

*note_label|IMTA|Martinez|Martinezcite web
author=Martinez Austria, Polioptro F.
title=Efectos del Cambio Climatico en los Recursos Hidricos de Mexico
work=Instituto Mexicano de Tecnología del Agua
url=http://www.imta.gob.mx/gaceta/anteriores/g07-11-2007/gaceta-imta-07.pdf
accessdate=March 13 |accessyear=2008

*note_label|World Bank|Olson|Olsoncite web
author=Douglas Olson
title=Mexico: Water Public Expenditure Review
work=World Bank
url=http://wbln0037.worldbank.org/852572430067B82D/DOC_VIEWER?ReadForm&I4_KEY=7BE0C4F2B7C482B285256BCE0066AFC44E15B07A6E9F500C8525701300058C34&I4_UNID=8A691A867B6F938185257222005E5ED9&
accessdate=March 10 |accessyear=2008

*note_label|simmons|Sanderson|Sandersoncite journal
author=Sanderson, S.E.
title=Agrarian Populism and the Mexican State: The Struggle for Land in Sonora
journal=University of California Press
year=1981

*note_label|arizona|Scott|Scottcite journal
author=Scott, Christopher A. and Banister, Jeff M.
title=The Dilemma of Water Management “Regionalization” in Mexico under Centralized Resource Allocation
journal=University of Arizona.
year=2007
volume=05
issue=07
pages=11–19
url=http://geog.arizona.edu/about/GRD%2005_07%20Discussion%20Paper.pdf

*note_label|World Bank|Tsur|Tsurcite web
author=Tsur, Yecov
title=Pricing Irrigation Water: Principles and Cases from Developing Countries
work=World Bank
url=http://books.google.com/books?id=gRHnRHkl28gC&pg=PA90&lpg=PA90&dq=irrigation+water+tariffs+in+Mexico&source=web&ots=w-OdLwxRiF&sig=KoQg6n50A6DhsTq-Et87X21FZos&hl=en#PPA92,M1
accessdate=March 21 |accessyear=2008

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