Geography, climate and population
Jamaica is located to the south of Cuba and forms part of the Greater Antilles, at latitude 18o15’N, longitude 77o30’W. It is the largest island of the English-speaking Caribbean with a total area of 10 990 km2. In 2012, the total physical cultivated area was estimated at 220 000 ha, of which 55 percent (120 000 ha) consisted of temporary crops and 45 percent (100 000 ha) of permanent crops (Table 1). Permanent meadows and pasture cover 229 000 ha, which brings to total agricultural area to 449 000 ha. The country is divided into fourteen administrative districts, called Parishes. The capital is Kingston.
The country has three landform regions: the eastern mountains, the central valleys and plateaus, and the coastal plains. There are a series of mountain ranges along the major WNW-ESE axis of the island. In the eastern third, these mountains generally exceed elevations of 1 000 m with Blue Mountain Peak, the highest point, rising to a height of 2 256 m. North of the Blue Mountains lie the John Crow Mountains. Major alluvial lowlands occur in the southern half of the island, where they are often associated with coastal swamps. The other main topographical feature is a narrow and discontinuous coastal plain. Karst formations dominate the island.
The island’s climate can be classified as tropical maritime, hot and humid with a temperate interior. Mean daily temperatures range from 26°C in February to 30°C in August in the lowlands, and from 15°C to 22°C at higher elevations. Daily sunshine hours are fairly constant throughout the year, averaging about 8.2 hours in the southern plains.
Long-term mean annual rainfall over the island is about 2 051 mm. Much of the rainfall results from the northeasterly trade winds, which deposit most of their moisture on the northern slopes of the axial mountain ranges, while the southern half of the island is in rain shadow. Annual rainfall on the northeastern slopes of the Blue Mountain Range is generally 3 000 to 5 000 mm, whereas in the south coastal plains of Saint Catherine and Clarendon it is generally less than 1 500 mm. Annual rainfall exhibits a characteristic pattern, with a primary maximum in October and another in May. The main dry season lasts from December to April.
Jamaica regularly comes under the influence of tropical storms and hurricanes during the period of July to November, characterized by flood-producing rainfall of high intensity and magnitude.
In 2013, the total population was about 2 784 000, of which around 48 percent was rural (Table 1). Population density is 253 inhabitants/km2 but is unevenly distributed. In 2003, the total population was estimated at 2 647 000 reflecting an average annual demographic growth rate over this period of 0.5 percent.
In 2012, 93 percent of the total population had access to improved water sources (97 and 89 percent in urban and rural areas respectively) and 88 percent of the total population had access to improved sanitation (78 and 82 percent in urban and rural areas respectively).
Economy, agriculture and food security
In 2013, the Gross Domestic Product (GDP) was US$ 14 362 million and agriculture accounted for 7 percent of GDP. In 2013, total population economically active in agriculture is estimated at 208 000 inhabitants (17 percent of economically active population), of which 27 percent is female and 73 percent is male.
The agricultural sector has experienced numerous challenges resulting in a decline in output and direct contribution to GDP largely due to increased trade liberalization, competition and low productivity. But it represents a critical component of Jamaica’s national development as an important contributor to GDP, employment, foreign exchange earnings and rural livelihoods. Due to an overall decline in public sector activity, funding for agriculture is projected to be limited to those areas of public good, such as research for smallholder crops, regulatory controls, etc.
Most of the foreign exchange in Jamaica is from tourism, remittances, and bauxite/alumina mining.
Jamaica has greater resilience and potential for food security than most other Caribbean Small Island Developing States (SIDS) as local substitutes for imported staples are widely produced and farmers have implemented successful coping and adaptation mechanisms at the farm-level through damage reducing strategies.
The top imported foods in 2011 by quantity include maize, wheat, soybeans cake, non-alcoholic beverages, and raw sugar. The top exports from Jamaica include raw sugar, barley beer, alcoholic beverages, and non-alcoholic beverages. The main traditional export crops include sugar, bananas, coffee, citrus, cocoa and pimento.
The major trade agreements impacting agriculture include the European Partnership Agreement (EPA), the Caribbean-Canada Trade Agreement (CARIBCAN), the Caribbean Basin Initiative (CBI), and the Caribbean Single Market Economy (CSME).
Large farms are generally located on the plains while small farmers occupy the hillsides.
Surface water and groundwater resources
About 52 percent of the average annual rainfall is lost to evapotranspiration. The internal renewable water resources (IRWR) are 10 823 million m3/year with 9 111 and 5 472 million m3/year for surface water and groundwater respectively and the overlap between surface water and groundwater (baseflow) being 3 760 million m3/year (Table 2).
The central mountain ranges divide the catchment areas for rivers which drain either to the north or to the south coasts. Surface runoff predominates on outcrops of basement rocks and interior valley alluviums, whereas groundwater is the dominant water resource associated with the karstic limestone and coastal alluviums. The surface water resources are characterized by a marked seasonal variability in flow. Streams flowing northward originate mainly in the tertiary limestone. These are mostly perennial rivers, like the Martha Brae and White rivers, with significant baseflow components and low seasonal flow variability. Exceptions are the Great river and several rivers in the Blue Mountains basin which, like many of the south draining rivers, are characterized by widely varying seasonal flows and comparatively low baseflow. Some of the catchments consist of cretaceous volcanoclastic of low permeability.
Jamaica is subdivided into ten major hydrological basins. The basins are further subdivided into 26 watershed management units (WMU). The WMUs and basins are presented in Figure 1.
Almost 40 percent of the IRWR are considered exploitable or reliable, defined as daily flow exceeded during 90 percent of the time for surface water and quantity of water which can be withdrawn over a long period without impairing the limestone and alluvial aquifers as a water source or causing contamination by seawater intrusion for groundwater. About 20 percent from the limestone aquifer are developed through wells, mainly in the Río Cobre and Rio Minho. However, in other basins, the water is generally available as base flow and is exploitable through run-of-river developments.
In 2000, desalinated water produced was estimated at 0.5 million m3.
The National Water Commission (NWC) collects wastewater and sewage from over 600 000 customers across the country. Wastewater is treated and used for irrigation, but this data is not currently being collected.
Approximately 23 percent of the rural population relies on rainwater harvesting via roof collection. The NWC and Local Parish Councils manage 353 public rainwater harvesting catchment tanks. In 2003, 15.3 percent of the population used rainwater harvesting as a water source.
Lakes, dams and wetlands
There are two major raw water storage facilities, both located in Saint Andrew. The Mona reservoir, with intakes at the Hope and Yallahs rivers, has a storage capacity of 3.67 million m3. The Hermitage Reservoir, with intakes at Ginger river and Wag/Morsham river, has a storage capacity of 1.78 million m3.
Jamaica is party to the Convention on Wetlands of International Importance especially as Waterfowl Habitat (Ramsar Convention). Three sites in Jamaica have been designated as Ramsar sites: Black River Lower Morass, Palisadoes Port Royal, and Portland Bight Wetlands and Cays.
In 2007 total water withdrawal was estimated at 812 million m3 of which 448 million m3 (55 percent) for agriculture, 288 million m3 (35 percent) for municipalities and 76 million m3 (10 percent) for industries (Figure 2 and Table 3). In addition, it is said that around 903 million m3/year needs to be reserved for the environment.
In 1993, about 92 percent of the water was withdrawn from groundwater sources and the remainder from surface water (Figure 3). However, use of groundwater for irrigation has high operation costs, and many irrigation well fields on the south coast have high salinity issues. Surface water is therefore imported from the Yallahs river of the Blue Mountain South basin to meet the domestic demands of the Kingston Metropolitan Area. The alluvial and limestone aquifers are widely tapped for irrigation supply.
The maximum agricultural water demands are in the Rio Cobre and Rio Minho basins, which account for about 71 percent and 89 percent of the total demand in these basins.
Irrigation and drainage
Evolution of irrigation development
According to the National Irrigation Development Plan (NIDP), areas suitable for irrigation have been classified into three land categories: (1) lands which may be irrigated with all common irrigation techniques; (2) lands suited only to sprinkler and localized irrigation techniques; (3), lands with generally steep slopes (>10 percent) and thin soils, which are productive with careful management of the limitations and responsive to manual irrigation. This third category applies mainly to small hillside farmers. From this analysis 90 811 ha were classified as Category 1 and 2, while 97 095 ha were classified as Category 3. These categories do not take water resources into account.
Irrigation has always played a significant role in the island’s agriculture, and the need to continuously improve irrigation practices has long been recognized. Over the years some of the improvements which have been made have included channel lining and utilization of closed pipes in order to improve conveyance efficiencies, the use of water measuring techniques to encourage improved management, and the use of overnight storage facilities. In 1997, about 25 220 ha were irrigated.
In 2010, the area equipped for irrigation is estimated at 30 682 ha. Surface irrigation accounts for 23 012 or 75 percent, sprinkler irrigation for 5 216 ha or 17 percent and drip irrigation for 2 454 ha or 8 percent (Table 4 and Figure 4).
Public irrigation systems managed by the National Irrigation Commission (NIC) cover approximately 50 percent of the total area equipped for irrigation, commercial estates and private individual systems the other 50 percent.
The NIC is responsible for operating and maintaining delivery systems for six public districts: Rio Cobre, Saint Dorothy, Mid-Clarendon, Hounslow, Braco and Yallahs. The networks consist of open canals and pressurized pipelines. Water is abstracted from river diversions, small storage reservoirs and deep wells. In the private sector, in addition to sugar estates in Saint Catherine which receive much of their irrigation water from NIC, there are several commercial estates which have implemented their own irrigation systems. Many farmers with small holdings in most parishes irrigate vegetables or fruit trees using their domestic water supply or from local surface sources or springs or stored precipitation. In general, irrigation in Jamaica is characterized by low efficiencies and significant wastage of water.
Role of irrigation in agricultural production, economy and society
In 2010, the harvested irrigated crop area covered 30 682 ha, giving an irrigated cropping intensity of 100 percent. Of the total harvested irrigated crop area, 12 000 ha or 39 percent were sugarcane, 8 682 ha or 28 percent vegetables, 8 000 ha or 26 percent citrus and 2 000 ha or 7 percent bananas (Table 4 and Figure 5).
Irrigated sugarcane is mainly on public schemes using surface irrigation, whereas private schemes favour more high valued crops (e.g. banana and vegetables) and systems with higher efficiencies such as localized and sprinkler irrigation. It should be noted that non-irrigated crops such as coffee, cocoa, and pimento are also important to the economy.
Based on an analysis of 51 projects undertaken under the NIDP, the average construction cost of irrigation schemes was estimated to be US$4 785/ha, with a range from US$943/ha to US$20 450/ha. The average operations and maintenance cost was estimated to be US$740/ha, with a range from US$13/ha to US$1 714/ha.
Water management, policies and legislation related to water use in agriculture
The main agencies responsible for water resources management, especially relating to the agricultural sector, are:
Integrated water resources management is being incorporated into the national Water Sector Policy as a part of the GOJ’s Vision 2030 National Development Plan.
The MOAF’s Production and Productivity Programme aims to improve best management practices among groups of farmers, including incorporating drip irrigation systems integrated with the use of black tanks.
Agricultural financing can be accessed through the Development Bank of Jamaica via the Peoples Cooperative Banks and other financial intermediaries. The Government of Jamaica (GOJ), Caribbean Development Bank (CDB), and Inter-American Development Bank (IDB) have embarked on funding for several irrigation projects under the National Irrigation Development Plan. The plan includes increasing access for loans and grant funding to farmers to upgrade farms inclusive of small-scale irrigation systems, as well as to expand irrigation services in major agricultural production areas.
FAO has provided funding to establish a rainwater harvesting project in Jamaica, consisting of 11 pilot projects in South Saint Elizabeth and Manchester.
Policies and legislation
The following laws and policies are key in water resources management:
Environment and health
Groundwater sources are becoming polluted due to the bauxite-alumina industry, saline intrusion in production wells in the southern plains, and excessive nitrates due to improper sewage disposal, especially in Kingston.
Waterlogging, salinity, disruption of water tables and damage to the natural environment and water supply systems are some of the consequences of irrigation. Many farmers do not follow best management practices related to pesticides management, fertilizer application, slope management, soil conservation, etc. Though, the use of pesticides has been reducing since 2006. This can be due to either more environmentally friendly farming practice, or reduced agricultural area being cultivated. Fertilizer imports have also decreased since 2008.
Climate change impacts are already being observed in the Jamaican agricultural sector, resulting in lower yields due to the prevalence of more pests and diseases. Coffee and banana production have faced many extreme weather events during the past years, mainly hurricanes, which have destabilized the agricultural industry and caused declining productivity and crop damage. A significant contributing factor to vulnerability is land degradation due to the use of unsuitable farming techniques.
Prospects for agricultural water management
Future trends are projected for water demand to increase in total as well as for the agricultural sector. Plans are continuing to implement the 51 irrigation projects under the NIDP. Alternative technologies for water supply are also being investigated.
Steps to identify funding sources, expand irrigation systems, and construct and operate new systems will continue. The focus of the NIC is planned to shift to partnerships between NIC and private firms, or have a private operator build and operate the irrigation scheme directly. Cost recovery efforts will include increasing the collection rate, improving operational efficiency, and moving tariffs toward cost recovery as much as possible.
Major coping strategies suggested in the FAO report “Climate change and agriculture in Jamaica: agricultural sector support analysis” include enhancing irrigation water use efficiency to reduce overall water use requirement.
Main sources of information
Agriculture Task Force. 2009. Vision 2030 Jamaica: Final draft agriculture sector plan.
Agritrade. 2011. Jamaican agricultural trade policy reviewed under WTO TPR process.
CARICOM. 2006. Agriculture development profile – Jamaica. Caribbean Community Secretariat. Extracted from the National Medium Term Priority Framework for FAO Assistance – Jamaica Draft document, 2006.
CIA. 2009. The world factbook. Central Intelligence Agency.
CEG. 2013. Draft final report for the assessment of the water sector in the Caribbean. Cole Engineering Group
ESL Management Solutions Limited. 2009. Strategy and plan of action: Development of a national water sector adaptation strategy to address climate change in Jamaica.
FAO. 2013. Climate change and agriculture in Jamaica: agriculture sector support analysis. Environment and Natural Resources Management Series 21: Climate Change. Food and Agriculture Organization of the United Nations
FAO. 2014. FAOSTAT database. Food and Agriculture Organization of the United Nations.
Index mundi. 2013. Jamaica.
IMF. 2014. IMF Executive Board concludes 2014 Article IV consultation and fourth review under the extended fund facility with Jamaica and approves US$70.9 million disbursement. Press Release No. 14/296. International Monetary Fund
Meditz, S.W. and Hanratty, D.M., eds. 1987. Caribbean islands: a country study. Washington: GPO for the Library of Congress.
Meteorological Service Jamaica. 2002. Climate – general.
Ministry of Water and Housing. 2004. Jamaica Water Sector Policy: Strategies and action plans.
MWLECC. 2014. Draft Water Sector Policy. Ministry of Water, Land, Environment and Climate Change.
NEPA. 2010. State of the Environment report. National Environment and Planning Agency.
NIC. 2011. Annual report – 2010-2011. National Irrigation Commission Limited.
NIC. 2014. NIC website. National Irrigation Commission Limited.
Planning Institute of Jamaica. 2009. Vision 2030 Jamaica – National Development Plan.
Statistical Institute of Jamaica. 2011. 2011 Census of population and housing - Jamaica.
United Nations Statistics Division. 2007. State of water statistics in Jamaica. Regional workshop on water accounting: Santo Domingo.
US Army Corps of Engineers. 2001. Water resources assessment of Jamaica.
Water Task Force. 2009. Vision 2030 Jamaica: National development plan, water sector plan.
WRA. Creating an enabling environment for rainwater harvesting, rainwater harvesting & irrigation, rainwater harvesting for potable water supply. Water Resources Authority.
WRA. Website of Water Resources Authority. Hydrology of Jamaica. http://www.wra.gov.jm/dynaweb.dti?dynasection=general&dynapage=hydrology. Website accessed on 08/04/2015. Water Resources Authority.
World Bank. 2014. Jamaica.
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