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Nigeria is located in the tropical zone of West Africa and has a total area of 923 770 km². It is bordered to the west by Benin, to the northwest and north by Niger, to the northeast by Chad and to the east by Cameroon, while the Atlantic Ocean forms the southern limits of Nigerian territory. Land cover ranges from thick mangrove forests and dense rain forests in the south to a near-desert condition in the northeastern corner of the country. Nigeria is a federal republic constituted by 36 States and a capital territory.
Three broad ecological zones are commonly distinguished in the country: the northern Sudan Savannah, the Guinea Savannah zone or Middle Belt, and the southern rainforest zone. A mountainous zone is found at the border with Cameroon and the plateau zone in the centre of the country.
Total agricultural land is estimated at almost 71 million ha, which is 77 percent of the total area of the country. In 2013, the cultivated area was 40.5 million ha, of which arable land covered 34.0 million ha and permanent crops 6.5 million ha (Table 1). Internal water bodies cover around 1 million ha (FMWR, 2014).
The climate is semi-arid in the north and gradually changes toward the south into savanna and finally tropical rainforest with humid conditions. Except for an ultra-humid strip along the coast with rainfall averages of over 2 000 mm/year, where it rains almost all year round, rainfall patterns are marked by distinct wet and dry seasons of varying duration. The rainy season lasts from 9-12 months in the south to 2-3 months in the northern area. Rainfall is concentrated in the period June-September. Deficiency in total annual precipitation is a problem in parts of the country, particularly in the northern parts where it is only 400 mm. In most other areas, however, the major problems are the distribution in time and space and the low dependability of rainfall. Mean annual rainfall over the whole country is estimated at 1 150 mm. Mean annual pan evaporation is 2 450 mm in the southeast, 2 620 mm in the centre and 5 220 mm in the north of the country. The average air temperature is 26.6°C.
Nigeria is by far the most populous country in Africa. With its 182 million people it accounts for over one-seventh of the total population of Africa’s 54 countries (2015). The population density of 197 inhabitants/km² is also high, being almost five times the population density for Africa as a whole. Annual growth rate during 2005-2015 is about 2.7 percent and 52 percent of the population is rural in 2015, which is the same as 10 years earlier.
In 2014, the Human Development Index ranks Nigeria 152 among 188 countries. Life expectancy is 53 years and the under-five mortality is 113 per 1000 births, both progressing from 46 years and over 200 per 1000 in the 1990s. Around 66 percent of the children in 2010 are enrolled in primary education with over 10 point difference between girls (60 percent) and boys (71 percent). There is no data available regarding secondary school’s enrolment, but only 10 percent are enrolled in tertiary education with a reduced gap between female (9 percent) and male (12 percent) (WB, 2016). Adult literacy is 51 percent in 2008, with a significant gap between female literacy (41 percent) and male literacy (61 percent). Poverty concerns almost half of the population (46 percent) in 2009 and is more common in rural areas (53 percent of the rural population). Despite steady GDP growth, poverty increased over the period 2004-2010 as a result of growing unemployment, especially in the northern areas (FMWR, 2014). In 2015, 81 percent of the urban and 57 percent of the rural population were using improved drinking water sources, that is 69 percent of the total population This represents a major improvement since 2002 when only 60 percent of the population had access to an improved drinking water source (JMP, 2015).
The economy is highly dependent on oil revenues, which account for about 90 percent of total exports and for nearly 75 percent of government revenues (WB, 2014). The country’s gross domestic product (GDP) was estimated at US$569 000 million in 2014 and the contribution from agriculture was 20 percent. Agriculture provides occupation to 31 percent of the economically active population in 2007 (FMWR, 2014) and is thus the largest employer in the country, especially considering the fact that 45 percent of the economically active population unemployed (WB, 2014).
Nigerian agriculture, however, remained until recently largely uncompetitive in major crops when compared with international markets (WB, 2014) and required large food imports. But between 2011 and 2014 drastic reforms of the agricultural sector, aimed at increasing production and attracting investments through incentives for agricultural commodity producers, led to creation of jobs, sharp increase in food production and thus reduction in food imports.
Farming systems are mainly smallholder-based and agricultural landholdings are scattered. Simple, low-input technology is employed, resulting in low-output labour productivity. A typical farm holds an average of 2.5 plots of 0.5 ha each (NBS, FMARD and WB, 2014). Nigeria’s wide range of agro-ecological zones allows for a diversity of crop production activities:
Major crops produced are rice, cassava, yam, maize, sorghum, millet and groundnut. The country is self-sufficient in most basic staples such as cassava and yam, but it is still heavily dependent on import of processed agricultural products, particularly rice, wheat, sugar, livestock products and fish (FMWR, 2014). The main agricultural exports are cocoa, nuts and sesame. Livestock in 2011 consisted of 19.5 million cattle, 72.5 million goats, 41.3 million sheep, 7.1 million pigs, 158 million poultries, 0.97 million donkeys and 28 000 camels.
Nigeria achieved the first Millennium Development Goal (1c) of halving the proportion of hungry people by 2015, despite population growth. As a result, the prevalence of undernourishment is 6.4 percent in 2014, down from 21 percent in 1990-92, thanks to agricultural and trade reforms (FAO, 2015).
The country is well drained with a close network of rivers and streams. Some of these, particularly the smaller ones in the north, are seasonal. There are four principal surface water basins in Nigeria (Table 2), the Lake Chad basin being the only internal drainage basin in the country.
For the purpose of water resources management, Nigeria is divided into eight hydrological areas (HA), considering hydrological and topographical conditions (Table 3).
The Niger river flows from Benin into Nigeria in south-easterly direction. A major tributary in Nigeria is the Benue river, which joins the Niger river near Lokoja. Then the Niger river flows southwards to the Gulf of Guinea through the Niger Delta. Its discharge in the ocean combines two types of flow during the year. Around March-April, the discharge reflects mostly the inflow from Niger with the peak occurring almost half year after the precipitation event in the upper Niger river because of the inland delta in Mali. The runoff in the lower reach almost coincides with the precipitation season with the peak around August-September.
Nigeria has extensive groundwater resources:
Low-lying areas flooded during the wet season, known as fadama areas, are scattered across the ecological zones of Guinea Savanna, Sudan Savanna, and the Sahel. These diverse wetlands are valuable for grazing, agriculture and municipal uses, and are of international importance as breeding grounds for migratory birds, thereby having a global value for biodiversity. Flood plains cover over 515 000 ha and 11 sites are declared Ramsar sites for a total area of 1 076 728 ha in 2013. The main wetlands are the Lake Chad wetlands in Nigeria lying in the semi-arid Sahel corridor (> 600 000 ha), the Lower Kaduna-Middle Niger Floodplain (> 200 000 ha) and the Baturiya Wetland (> 100 000 ha) (Ramsar, 2013).
Long-term average internal renewable surface water resources are estimated at 214 000 million m³/year and renewable groundwater resources at around 87 000 million m³/year, but 80 000 million m³/year is considered to be overlap between surface water and groundwater, which gives a value of total internal renewable water resources (IRWR) of 221 000 million m³/year (Table 4). External water resources are estimated at 65 200 million m³/year, which is the inflow from the Niger basin from Niger (32 400 million m³/year) and from Benin (3 800 million m³/year), as well as the Benue river and its tributaries from Cameroon (29 million m³/year). Surface water leaving the country to other countries is estimated at 2 900 million m³/year, of which 200 million m3/year through the Maradi river to Niger and 2 700 million m³/year through the Komadougou Yobé river to Chad. The dependency ratio is 23 percent and the long-term average annual total renewable water resources are 286 200 million m³/year, or 1 571 m³/year per capita in 2015.
Annual exploitable groundwater resources are estimated at about 59 510 million m³, distributed as follows: 10 270 million m³ in the north, 25 480 million m³ in the Middle Belt and 23 760 million m³ in the south.
Currently, there are 264 existing dams in Nigeria (FMWR, 2013). Cumulated capacity of larger dams is estimated at 50 667 million m³. The main dams, such as Kainji, Jekara and Jebba, are associated with large hydropower generation plants. The average effective storage is about 78 percent of the total storage capacity. There are about 30 dams under construction for an additional capacity of 1 600 million m³ and plans for the development of 10 000 million m³ by 2020, in addition to the rehabilitation of 50 existing dams (FMWR, 2014). These figures do not include the controversial Dasin Hausa dam, with an expected capacity of 16 000 million m³, which was planned together with the Lagdo dam in Cameroon operational since 1982 (see “International water issues” below).
No data is available regarding the volume of wastewater produced, collected and treated, but most of it finds its way back to water bodies without any treatment. There is a very limited volume of desalinated water produced. A project of brackish water desalination with a capacity of 73 million m³/year is currently being developed in Lekki Lagos.
Main transboundary rivers flowing into Nigeria are the Niger river, flowing from Benin and Niger, and the Benue river, flowing from Cameroon, which joins the Niger river at Lokoja at approximately 400 km north from the estuary. Nigeria also shares Lake Chad with Niger, Cameroon and Chad (Table 5). In addition to being part of the Niger Basin Authority and the Lake Chad Basin Commission, Nigeria is also part of two binational joint commissions. The Nigeria-Niger Joint Commission initiated the Maiduguri Agreement signed on 18 July 1990, and amended 5 October 1998, dealing with development, conservation and utilization of the water resources of the Komadougou-Yobe sub-basin in particular. The Cameroon-Nigeria Mixed Commission was established after Lake Chad receded in order to settle the conflict over the blurred border between the two countries. A protocol to exchange daily data on flows, especially release from the Lagdo dam, and coordinate large infrastructures was also signed with Cameroon.
There are issues with these transboundary basins, mostly associated with the development of dams in the upstream countries Niger and Cameroon:
Transboundary groundwater is limited in sedimentary rock area. In four of the hydrological areas (HA) of Table 3 transboundary groundwater flow exist: Sokoto (HA1), Upper Benue (HA3), Western Littoral (HA6) and Lake Chad (HA8).
Total annual water withdrawal was estimated at 12 475 million m³ for the year 2010. Agriculture is the sector withdrawing the largest share of water, with about 5 510 million m³ (44 percent) made up of 4 549 million m³ for irrigation, 233 million m³ for livestock and 728 million m³ for aquaculture. The latter sub-sector saw a strong development in recent years. Estimations are based on irrigation water requirements and cropping patterns. Municipalities’ water withdrawal is estimated at 5 000 million m³, or 41 percent of the total water withdrawal. Around three quarter of the municipal water withdrawal is from groundwater resources, the remaining coming from surface water. Industry is the sector with the smallest withdrawal with 1 965 million m³ (14 percent) (Table 6 and Figure 1).
About 41 percent of the water demand is expected to be met from surface water source and 59 percent from groundwater source. Groundwater is available and used in the whole country for all types of uses–water supply, private irrigation, livestock, aquaculture and industries–either in the Basement Complex area, where depth of boreholes is 50m in average for a 10 to 150 m³/day yield, or from sedimentary rock area with deeper boreholes with larger yields (50 to 400 m deep for 10 to 500 m³/day). There are about 64 500 boreholes in Nigeria, of which 57 600 are for public water supply. Motorized and hand pumps are installed into boreholes, but only 63 percent of boreholes are functional due to breakdown of pumps. Groundwater withdrawal is estimated at about 2.3 million m³/year (FMWR, 2014).
Irrigation potential estimates in Nigeria vary from 1.5 to 3.2 million ha. The latest estimate gives a total of about 2.3 million ha, of which over 1 million ha are in the north (WB, 2014).
Traditional irrigation dates back to the 9th century. Until recently, the majority of irrigation was located in naturally flooded swamps, or fadamas, usually controlled with simple mud bunding. Fadamas are lowlands, flood plains or valley bottoms with a high water table. The traditional dry season farming in northern Nigeria was practiced in the valley of the Komadougou Yobe along the border with Niger and on the swampy area of Lake Chad and was dominated by simple lift systems (shadufs replaced by pumps in the 1970s). Flood-recession cultivation was possible in the Lake Chad region, although it has never become widespread. In the early 1950s, some rice schemes and simple flood control schemes were created in the Niger State in the centre-west of the country (Blench, 1993). Public irrigation was initiated only in the 1970s, during the oil boom and following a strong drought in 1970-75. The three pilot irrigation schemes developed in the early 1970s, Bakolori in the northwest, Kano in the north and Chad basin in the northeast, were successful. Hence, substantial investment was made by the government during the 1970-80s, especially in dams. However, the corresponding irrigation infrastructure was often not developed due to economic reform made in the late 1980s aiming at economic efficiency and higher productivity, resulting in budget reduction for public irrigation infrastructure development. At the same time, agricultural development projects (ADPs) were designed to develop small-scale, farmer-based, privatized irrigation systems in fadama lands for wheat and vegetable cultivation especially during the dry season by providing pumps and tubewells. The National Fadama Development Project (NFDP) built on the ADPs’ achievements from 1993 onwards.
The area equipped for irrigation in 2004 was 293 117 ha, comprising 238 117 ha full control irrigation and 55 000 ha of equipped lowlands, i.e. improved fadamas. About 75 percent, or 218 840 ha, of the equipped area was actually irrigated in 2004.
In 2010, the area equipped for irrigation increased to 325 106 ha, of which 232 106 ha are full control irrigation and 93 000 ha equipped wetlands (FMWR, 2014; Table 7 and Figure 2). The area equipped for full control irrigation can be classified into:
In addition, non-equipped flood recession cropping was being practiced on 681 914 ha, bringing the total water-managed area to 1 007 020 ha in 2010. Traditionally many farm families in Nigeria had cultivated small areas in fadamas during the dry season, using water manually drawn from shallow wells or streams. Major fadama areas are located along the flood plains of the Niger, Sokoto Rima, Benue and Yobe rivers.
With irrigated land being less than 1 percent of the cultivated area, the contribution of irrigated agriculture to total crop production is small. The impact of irrigation is felt only with regard to specific crops such as wheat, sugarcane and to some extent rice and vegetables. In the 2003-2004 season irrigated grain production contributed to 0.9 percent of the total grain production and irrigated vegetable production contributed to 2.3 percent of the total vegetable production. The main irrigated crops in 1999 were vegetables, wheat, maize and sugarcane. Other irrigated crops were rice, potatoes, cotton, cowpeas, oil palm, citrus fruits, cocoa, rubber, taro and cashew nuts. The crop with the highest increase in net return resulting from irrigation is sugarcane, due to a four-fold per hectare yield increase. Next are onions and tomatoes, the least profitable crops being rice and wheat.
Productivity of irrigated agriculture is negatively impacted both by land fragmentation–in schemes and in fadamas–and under-utilization of large dams in particular in the North where most dams and irrigation infrastructures are located. This under-utilization resulted in large irrigation schemes becoming unsustainable physically, environmentally and financially and non-functional schemes have reverted back to rainfed cultivation. This situation makes irrigated agriculture uncompetitive and unattractive, thereby discouraging potential investors and youths to participate in irrigated agriculture (FMWR, 2013). In 2010-2011, 2.8 percent of farm household plots were irrigated and only 1.6 percent the following year (NBS, FMARD and WB, 2014). Irrigation is most common in the northwest with 6 percent of plots reported as irrigated compared to 1.3 percent in the southwest in 2010-2011 with slightly higher rate of plots being irrigated in the urban than in the rural areas (NBS, FMARD and WB, 2013).
Crops cultivated in public irrigation schemes are diverse, including rice, maize, tomatoes and other vegetables. However, rice generally constitutes the major crop cultivated in the rainy season. Irrigated rice is with 510 050 ha nevertheless less common than rainfed upland and lowland rice together with 1 243 151 ha and 47 799 ha in 2008 respectively (FMWR, 2014). However, irrigated rice has the highest yield with 3.5 tons/ha, which is almost double the rainfed rice yield (1.7 tons/ha for rainfed upland rice and 2.2 tons/ha for rainfed lowland rice) (Ugalahi, 2016). High irrigated rice yields are obtained in some public irrigation schemes. For example, the Bakolori irrigation scheme, one of the largest schemes in the country with over 5 000 ha actually irrigated and almost 19 000 registered farmers in 2014, experiences yields comparable to Asian rice with 5.4 tons/ha during the dry season and 4.6 tons/ha during the rainy season (IFPRI, 2015).
Irrigated agriculture reduces poverty as demonstrated by a study of the role of Kampe irrigation dam in Kogi State, where the poverty incidence reduced to 41 percent for beneficiaries of irrigation projects compared to 57 percent for non-beneficiaries in the same community (Gbenga, 2015).
Women do most of the water fetching in low-income urban areas, as they do in rural areas. They, together with children, are also the most affected by floods especially in the lower Niger river, since their share of the workload for most of the farming tasks is larger than the men’s share, in addition to doing most of the water fetching. They are thus more exposed to the flow release from upstream dams (Atakpu, 1999).
In 2007, out of the 15.7 million agricultural holders in Nigeria, 10 percent were women. Women nonetheless provide 70 percent of the agricultural workload and 90 percent of the animal husbandry workload and they also play a major role in producing, processing and marketing food crops. This is because under customary law, women rarely inherit land and primarily obtain use rights through their husbands. Although statutory law says women are entitled to inherit in the same way as men, this law applies only to women who are married under statutory law and only if there is a will. Furthermore, under both statutory and customary systems, land registration is usually in the man’s name. Ninety percent of registered land and properties are in men’s names. Less than 14 percent of women have land in their name. They also have limited access to agricultural inputs such as fertilizer, improved seedlings and agricultural extension services. Indeed male-headed households use considerably more inputs, except seeds, than female-headed households. Only 15 percent of beneficiaries of government programmes are women (FAO, 2016). Male-headed household plots are also more likely to be irrigated than plots cultivated by female-headed households: 3 percent of the former are irrigated against 1.3 percent of the latter in 2010-2011 (NBA and WB, 2013). These figures drop to 1.8 percent and nil respectively in 2011-12 (NBS, FMARD and WB, 2014).
The culture in some of the northern states prevents married women from direct participation in farming. Where culture practices are enforced strictly, so that married women cannot engage directly in fadama farming, they cultivate land they may inherit or purchase by using the labour of their husbands, friends, other male relatives or hired workers. This presents a cost disadvantage to such women as all fadama cultivation involves relatively high labour inputs. In some communities there is a belief that fadama farming is too complicated for women and women are excluded from the more productive aspects of farming.
Decision-making at household level is not very different between men and women. However, at the community level, female participation in decision-making is much lower than their male counterpart –1.7 percent and 17.4 percent respectively (AfDb, 2013).
Most large-scale irrigation schemes in Nigeria are fully equipped with drainage networks. For instance, in the Kano River Irrigation Project I the total area of 15 000 ha equipped with irrigation canals has a corresponding drainage network. This also applies to Bakolori Irrigation Project, South Chad Irrigation Project, Kiri Irrigation Project, Bagwai Irrigation Project, Lower Anambra Irrigation Project and Hadejia Valley Irrigation Project for example. Most is surface drainage. Subsurface drainage is not very common in the country, except in the irrigation schemes of the Savannah Sugar and Bachita Sugar Companies. However, most of the surface drainage networks are not operational due to encroachment by landless farmers, weed infestation, cattle crossing, tractor crossing during seedbed preparation for dry and wet season cropping, etc. Combined with poor on-farm water management practices, waterlogging and salinization appeared in of some irrigated fields (FMWR, 2015).
The Federal Ministry of Water Resources (FMWR) is the main national coordinating body in the water sector. The present FMWR was established in 2010, but inherited directly from the Water Resources Division established in the 1960s within the Federal Ministry of Agriculture (FMA). Merges and divisions between the FMWR and FMA have been frequent since then. Four of the eight FMWR departments are directly concerned with irrigation subsector matters:
The FMWR is also responsible for 16 parastatals agencies:
Other federal institutions involved in the irrigation subsector are:
The current institutional arrangement presents some overlaps, for example between the FMEnv and the FMWR’s Department of Water Supply (FMWR, 2014).
At the State level, agencies involved in the irrigation subsector are:
Public irrigation in the Nigerian context means schemes run either by River Basin Development Authorities (RBDAs) or by the States. A farmer group in each scheme is supporting the maintenance of irrigation facilities. And for example, in the Bakolori irrigation scheme, collective action on canal and drainage maintenance is relatively common and was often initiated by the irrigators themselves (IFPRI, 2015). However, the infrastructures are in most cases in dire need of rehabilitation with non-functional pumps, damaged or silted up canals. Non-equipped water managed areas are effective due to their low maintenance. Many of the public small schemes in the south of the country are effectively operational whilst some of the public large schemes are still active but operating at low capacity level and low cropping intensity (FMWR, 2014).
The National Fadama Development Project (NFDP) resulted in the formation of more than 9 000 Fadama User Associations (FUAs). And government policy is to subdivide schemes along the lines of one Water User Association (WUA) per distribution canal; thus, a WUA comprises 10-25 farmers. Responsibilities include operation and maintenance (O&M) of the canal and its structure and adherence to water scheduling programmes. WUAs have traditionally been weak from design to operation and maintenance of irrigation projects. They rarely are effective or active in most schemes.
Between 2006 and 2013 it became clear that that irrigation development did not progress as planned, that farmers did not get reliable delivery of irrigation water and that irrigated production sometimes decreased. So FMWR signed in 2014 a delegation of authority for large-scale public schemes to transfer tertiary irrigation and drainage facilities to WUAs. The WUAs Federations (WUAFs) will be in charge of O&M at tertiary and field level, and the collection of water charges, as soon as the new Water Bill has been passed.
Although for commercial use a license for water abstraction and use is required according to the 1993 Water Resources Act, it has not yet been implemented. As a result, either water is withdrawn without a license, even by governmental agencies, or a contract between the agency and the RBDA is considered to be a license (FMWR, 2014).
Only from 1983 onwards, a token irrigation water charge was requested to farmers. The water charge paid in most of public irrigation schemes is on average US$ 10/ha per season, while operation and maintenance (O&M) costs are estimated at US$61/ha/year for gravity-fed schemes and US$530/ha/year for schemes using pumps. The water charges are too low to meet the cost of water delivery. In most cases, charges were never collected and when they were, collection rate was weak. The Federal and State governments played a significant role in O&M expenses (FMWRRD, 1995), considering water supply as a social service (Brebbia and Bjornlund, 2014). But with economic reforms, it resulted in infrastructure deterioration and low level of productivity, requiring rehabilitation. The inadequate pricing is responsible for the cycle of poor services leading to lack of willingness to pay by the user (FMWR, 2014).
The main legislation regarding water management is the 1993 Water Resources Act No. 101 giving the FMWR significant power to control and coordinate activities for proper watershed management and resources protection and for public administration of water resources. A new National Water Resources Bill was drafted from October 2006 and will replace the 1993 Water Act, as soon as it is enacted by the National Assembly–still pending by mid-2016. It is based on the 2009 revised National Water Policy and includes principles of integrated water resources management and stakeholders’ participation.
In addition to the 1993 Water Resources Act, the following legislations also affect the water sector:
To complement these legislations, the following policies and strategies in relation with water apply in Nigeria:
More generally, the federal government launched an Agriculture Transformation Agenda (ATA) in 2011 to promote productivity growth.
Desertification is by far the most pressing environmental problem in the northern states along the border with Niger. Nigeria is presently losing about 351 000 km² of its land mass to the desert which is advancing southward at the rate of 0.6 km/year.
Soil degradation is induced by human activities, such as:
Hydrology downstream from dams and major diversions and pumping stations has been modified, especially in the north. Extensive areas of fadama, fisheries and wildlife habitats were wiped out.
The Hadejia Nguru Wetlands in the northeast of the country receive their water from the Hadejia and Jama’are rivers, which meet to form the Komadougou Yobe river, flowing northeast into Lake Chad. So far, more than half of the wetlands have been lost due to drought and upstream dams. New development could divert still more water from the wetlands for irrigated agriculture in upstream areas, affecting both the ecology and the irrigated agricultural production in the floodplain using water from the shallow groundwater aquifer, as recharging would decrease further.
Inappropriate agricultural practices, such as lack of crop rotation, adoption of maximum tillage, inadequate or total lack of fallowing, inadequate fertilization, overgrazing, absence of mulching, and the opening up of riverbanks have led to silting of riverbeds and loss of watercourses.
Expansion of irrigated crop production in the fadama lands has led to a lowering of the water table in some areas. Overexploitation of groundwater starts to be felt in some areas also for industrial and municipal use due to the non-enforcement of controlled drilling. In the northern areas, it could build-up salinity and in the southern parts, salt-water intrusions are threatening due to the lowering of the groundwater table, as it is already the case in metropolitan areas such as Lagos and Port Harcourt, located in the coastal plains.
The quality of the groundwater is generally good. The occurrence of iron rich water in the Niger Delta can sometimes constitute a major problem in some isolated localities in the dry deltaic plains (AfDB, 2013).
Wastewater treatment is almost inexistent, so most of the wastewater reaches water bodies without any treatment. The water quality of rivers is strongly influenced by human activities especially when passing through urban, industrial and agricultural areas. Generally, the water quality of rivers is good in the southern areas, but in the northern areas water quality decreases in the dry season with low flows.
In the Niger Delta, water resources are being polluted from oil exploration activities such as oil drilling and pipe leakages and vast farmlands have been destructed.
Poor operation and maintenance of irrigation infrastructures, results in deterioration of water delivery and low performances in already ageing irrigation schemes. In addition, enforcement of water legislation is weak, institutionsâ€™ mandates are overlapping, irrigators do not participate in decision-making, and lack of extension services leads to poor on-farm water management practices. As a result, development of irrigated agriculture in the country has been very slow and behind planned development.
The 1995 National Water Resources Master Plan (NWRMP) planned an additional 800 000 ha equipped for irrigation by 2020 to bring the total area equipped for irrigation at 1 500 000 ha, of which 1 120 000 ha public irrigation and 380 000 ha private irrigation. The new irrigation development plan of the updated 2014 NWRMP revised these targets with 468 752 ha of public irrigation and 335 000 ha of private irrigation, i.e. a total of 803 752 ha equipped for irrigation by 2030 (FMWR, 2014).
Achievement of these targets should first take advantage of the already existing infrastructures, both dams and irrigation schemes. Some storage dams, such as Dadin Kowa dam for example, are still in good condition, but nonetheless abandoned (WB, 2014). This is also the case for some irrigation schemes where the actually irrigated areas are far less than the developed area. The objective in 2013 is to increase the then 32 percent of equipped area actually irrigated under River Basin Development Authorities (RBDAs) management, and 55 percent under State government management, to 70 percent and 80 percent respectively by 2017 (AfDB, 2013b). However, in most cases dams and irrigation schemes require rehabilitation that would increase the water storage capacity and irrigation performances. New water storage infrastructures are also considered to allow for the planned irrigation targets.
The projected water demand by 2030 for agriculture, industries and municipalities is 16 584 million mÂ³, of which for municipalities 8 852 million mÂ³ (53 percent), for irrigation 6 245 million mÂ³ (38 percent), for aquaculture 1 166 million mÂ³ (7 percent) and for livestock 321 million mÂ³ (2 percent). Almost half of this demand could be supplied by groundwater resources, while the remaining would be by surface water resources (FMWR, 2014).
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