|Pays, régions, bassins fluviaux|
|Ressources en eau|
|Usages de l'eau|
|Irrigation et drainage|
|Ensembles de données|
|Cartes et données spatiales|
Info pour les médias
|Visualisations et infographies|
|ODD Cible 6.4|
|Year: 2011||Revision date: --||Revision type: --|
|Regional report:||Water Report 37, 2012|
Pakistan, with a total area of 796 100 km2, is located in Southern Asia (Table 1). It is bordered by India in the east, China in the northeast, Afghanistan in the north and northwest, the Islamic Republic of Iran in the southwest and the Arabian Sea to the south. Pakistan is divided into four provinces, namely the Punjab, Sindh, Khyber Pakhtunkhwa and Balochistan.
The geography of Pakistan is a profound blend of landscapes varying from plains to deserts, forests, hills and plateaus and ranging from coastal areas of the Arabian Sea in the south to the mountains of the Karakoram range in the north. Pakistan geologically overlaps both with the Indian and the Eurasian tectonic plates, where its Sindh and Punjab provinces lie on the northwestern corner of the Indian plate, while Balochistan and most of Khyber Pakhtunkhwa lie within the Eurasian plate, which mainly comprises the Iranian plateau, some parts of the Near East and Central Asia. Pakistan is divided into four broad geographic areas:
The land is mostly used for agriculture and rangelands. In 2009, the total cultivated area was an estimated 21.3 million ha, of which 20.4 million ha (96 percent) for annual crops and 0.9 million ha (4 percent) for permanent crops.
Pakistan lies in the subtropical arid zone and most of the country is subjected to a semi-arid climate. Based on physiographic factors and causes of diversity in climate, the country has been classified into four major climatic regions: i) the marine tropical coastland; ii) the subtropical continental lowlands; iii) the subtropical continental highlands; and iv) the subtropical continental plateau (ADB, 2003).
Water is a critical and limiting resource for the country’s sustained economic development. Linked to water, and based on physiography, in 1980 Pakistan was divided into ten agro-ecological zones, these are: i) Indus delta; ii) southern irrigated plain; iii) sandy desert; iv) northern irrigated plains; v) Barani (rainfed) areas; vi) wet mountains; viii) western dry mountains; ix) dry western plateau; and x) Sulaiman Piedmont (Ahmad, 2004a).
June is the hottest month on the plains and July in the mountainous areas, with temperatures over 38 °C, while the mean monthly minimum is only 4 °C in December/January. The average annual precipitation is around 494 mm, but is unevenly distributed. It varies from less than 100 mm in parts of Balochistan and Sindh provinces to more than 1 500 mm in the foothills and northern mountains of Punjab and Khyber Pakhtunkhwa. The mean Rabi season rainfall (October to March) varies from less than 50 mm in parts of Sindh province to more than 500 mm in Khyber Pakhtunkhwa. The mean Kharif season rainfall (April to September) varies from less than 50 mm in parts of Balochistan to more than 800 mm in the northern Punjab and Khyber Pakhtunkhwa.
About 60 percent of the rainfall in the monsoonal climate is received from July to September. The extreme variability in seasonal rainfall directly affects river flows, which vary considerably during the Rabi and the Kharif seasons. In the northern areas, at altitudes of more than 5 000 m, snowfall exceeds 5 000 mm/year and provides the largest resource of water in the glaciated zone. Around 92 percent of the country’s area is classified as semi-arid to arid, facing extreme shortage of precipitation. Most of the irrigated area is classified as semi-arid to arid. The reference crop evapotranspiration varies from 1 150 to 1 800 mm/year (Ahmad, 2008a).
In 2009, the total population was 170 million, of which around 64 percent lived in rural areas (Table 1). The average population density is 214 inhabitants per km2, with the population being concentrated on the Indus plain. The population density in the Balochistan plateau is extremely low because of the mountainous terrain and scarcity of water. Average annual population growth during the period 1999-2009 was an estimated 1.9 percent.
In 2008, access to improved drinking water sources reached 90 percent (95 and 87 percent for the urban and rural population respectively). Sanitation coverage was 45 percent (72 and 29 percent for urban and rural population respectively).
The total population economically active in agriculture was an estimated 24.0 million, which was 40 percent of the economically active population. About 29 percent of the population economically active in agriculture are women. In 2009, GDP was US$161 990 million of which agriculture accounted for 22 percent.
The roles of men and women are sharply defined, but women are actively involved in farming. Women are largely responsible for livestock production and maintenance, picking cotton, transplanting rice, harvesting and threshing other crops.
In 2007, the overall unemployment rate was 5.2 percent of the total labour force, out of which 4.7 percent of rural labour and 6.3 percent of urban labour is unemployed. There is an increase in the number of severely food-insecure people, from 23 percent in 2005-2006 to 28 percent in 2008. Food security in 2007-2008 had significantly worsened as a result of food price hikes. The total number of households falling into this category in 2008 was around 7 million; equal to about 45 million people. In relative terms, the increase is more pronounced in rural areas, where food expenditure rose by 10 percent and total expenditure by 4 percent (GoP, 2008b).
Food exports account for 13.2 percent of total exports, or US$2 050 million, contributing 26.1 percent to overall export growth. Rice accounting for 60 percent, has registered an impressive growth of 28.5 percent. Pakistan clearly benefited from the unprecedented rise in the international price of rice. Since Pakistan is a net exporter of rice, it is likely to benefit from the elevated international price of rice in coming years. This will encourage farmers in Pakistan to grow more rice and benefit from the higher prices on the international market. Other important foods registered impressive growth, such as fruits, oilseeds, nuts and kernels, meat and fish. More than a 67 percent increase in imports is attributed to wheat, followed by 47 percent for edible oil (GoP, 2008a; GoP, 2008b).
Pakistan can be divided into three hydrological units:
The flows in the river basins outside the Indus Basin Irrigation System (IBIS), the Makran coast and the Karan closed basin, are flashy in nature and do not have a perennial supply. They account for a total flow inferior to 5 km3 per year.
The long-term average annual precipitation for Pakistan is 494 mm, representing 393.3 km3 (Table 2). Precipitation in 2008 was 278 mm. Internally produced surface water is 47.4 km3/year, whereas internally generated groundwater is 55.0 km3/year. Some of the groundwater drains directly into the sea, while the rest feeds the base flow of the river system, which is an estimated 47.4 km3/year. Taking into account this overlap of 47.4 km3/year between surface water and groundwater, the internal renewable water resources (IRWR) are an estimated 55 km3/year.
River flows are composed of glacier melt, snowmelt, rainfall and runoff. The Indus basin has a total drainage area of 1.1 million km2, of which 47 percent lies in Pakistan, and the other 53 percent in China, Afghanistan and India. Because of the importance of irrigation on the Indus plain, the water balance of the Indus basin has been carefully studied, which is not the case for the other basins. Most results found, therefore, refer only to the Indus basin. The mean annual inflow into the country through the Indus river system is an estimated 265.08 km3, of which 21.5 km3 is from the Kabul river and other tributaries of the Indus river flowing from Afghanistan, 11.1 km3 from the eastern rivers of the Indus basin and 232.48 km3 from the western rivers, both flowing from India.
Under the Indus Water Treaty (1960) between India and Pakistan, it is estimated that 170.27 km3/year is reserved for inflow from India into Pakistan. The following rules apply:
Given the seasonal nature of the Himalayan runoff, roughly 85 percent of the annual flows are in the Kharif season (summer), and only 15 percent in the Rabi season (winter).
The Indus basin has a large groundwater aquifer covering a gross command area of 16.2 million ha.
In 2005, the total dam capacity was an estimated 23.36 km3 (Table 2). Currently, there are three large hydropower dams and 50 smaller dams (no more than 15 m high), while 11 smaller dams are under construction.
The designed live storage capacity of the three large hydropower dams in the Indus basin is 22.98 km3 (Tarbela 11.96 km3, Raised Mangla 10.15 km3, which includes recent raising of 3.58 km3, and Chashma 0.87 km3). The current live storage capacity of these three large hydropower dams is 17.89 km3, representing an overall loss of storage of 22 percent (World Bank, 2005). Pakistan can barely store 30 days of water in the IBIS. Each km3 of storage capacity lost means 1 km3/year less water that can be supplied with a given level of reliability. There is an urgent need for storage just to replace capacity that has been lost as a result of sedimentation. Given the high silt loads from the young Himalayas, two large reservoirs are silting rapidly. In 2008, because of the raising of the Mangla dam, the loss owing to sedimentation was recovered (WB, 2005).
The designed live storage capacity of 50 small dams is 0.383 km3. The information related to sedimentation and loss of live storage of small dams is not available. It was assumed, therefore, that on average 25 percent of the live storage in these small dams has been lost as a result of sedimentation.This has lead to the current live storage capacity of these small dams of 0.287 km3. There are more than 1 600 mini dams (less than 15 m high), which were constructed for small-scale irrigation, but the capacity of these mini dams is low because they are usually constructed for an individual farmer. The information on the live storage capacity of mini dams is not available. Storage of mini dams is negligible compared to that of small dams. According to certain estimates, the total designed capacity of these mini dams would be around 0.036 km3.
Pakistan has a hydroelectric potential of about 50 000 MW, when the whole of Chitral as well as Skardu gorges are comprehensively assessed. The Indus river and its tributaries are the main source of water. Its main gorge, between the Skardu and Tarbela, has a potential of almost 30 000 MW. These include Bashan (4 500 MW), Disso (3 700 MW), Banjo (5 200 MW), Thicket (1 043 MW), Paten (1 172 MW), Racicot (670 MW), Yuba (710 MW), Hugo (1 000 MW), Tunas (625), and Sakardu or Kithara (possibly 4 000 to 15 000 MW). Almost 20 000 MW potential is available on various sites on the rivers: Swat, Jhelum, Neelam, Punch and Kumar (Qazilbash, 2005).
In 2000, the total wastewater produced was an estimated 12.33 km3, while treated wastewater was an estimated 0.145 km3.
The Indus Water Treaty (1960) between India and Pakistan, described earlier, helped to resolve the issues between these two countries and allowed Pakistan to have large investments in the Indus Basin Project (IBP) during the 1960s to construct a network of canals and barrages to divert water from the western rivers to the command of the eastern rivers as replacement works.In the last few years, however, Pakistan has objected to India’s development of the of hydropower projects on the western rivers, Chenab and Jhelum.
Total water withdrawal in 2008 was an estimated 183.4 km3, of which surface water withdrawal accounts for 121.8 km3 (66.4 percent) and groundwater withdrawal accounts for 61.6 km3 (33.6 percent). This mainly refers to the IBIS, the withdrawal outside the IBIS being extremely small (GoP, 2008a) (Table 3 and Figure 1).
In 2008, agriculture withdrew an estimated 172.4, or 94 percent of the total water withdrawal . Municipal and industrial water withdrawal was an estimated 9.7 km3 and 1.4 km3, respectively (Figure 2) (GoP, 2008a; Zakria, 2000).
Most summer rains are not available for crop production or recharge to groundwater because of rapid runoff of torrential showers.
The overall irrigation efficiency in the IBIS is 40 percent (canal efficiency 75 percent, conveyance efficiency 70 percent and field application efficiency 75 percent). The water lost during conveyance and application largely contributes towards recharging groundwater.
In some areas, development appears to have reached the point where groundwater is being mined. Most urban and rural water is supplied from groundwater. Over 50 percent of the village water supply is obtained from hand pumps, which are installed by private households. In saline groundwater areas, irrigation canals are the main source of municipal water.
Groundwater is pumped using electricity and diesel fuels. There are currently one million tubewells, of which 87 percent are operated by diesel. Power failures, extended load shedding and poor electricity supply are the main reasons for the slow growth of electric tubewells compared to diesel-operated tubewells (Ahmad, 2008b).
Information on the use of treated wastewater and desalinated water is not available, it is however a minor fraction of the total. Sewage water from urban areas is used by farmers in the peri-urban areas to irrigate fodder crops and vegetables. Farmers also reuse drainage water during periods of water scarcity to supplement canal water supplies, but data are not available.
The irrigation potential of land and water resources is estimated to be equal to the cultivable area, or 21.3 million ha. In 2008, the area equipped for irrigation was around19.99 million ha, compared with 15.73 million ha in 1990. The total water managed area is an estimated 21.24 million ha, compared with 16.96 million ha in 1990, and can be divided according to the following classification (Table 4):
Apart form these water managed areas, some attempts have been made to develop water harvesting, which is known in Pakistan as Khushkaba, though it is not possible to quantify this area.
In 2008, out of the 19.27 million ha of full control irrigation schemes, 6.91 million ha were commanded by surface water (canals), 4.13 million ha by groundwater (wells, tubewells), whereas 7.96 million ha were commanded by both surface water and groundwater. Only 0.27 million ha were commanded by non-conventional sources of water (Figure 3). Surface irrigation is the only irrigation technique used. In 2008, the entire area equipped for full control irrigation was actually irrigated.
In 2008, small schemes (< 100 ha) covered 21.4 percent of the total area equipped for full control irrigation, medium-size schemes (100-25 000 ha) 2.3 percent and large schemes (> 25 000 ha) 76.3 percent (Figure 4).
Although irrigation takes place in other areas of Pakistan, information on the history and development of irrigation generally refers to the IBIS, where more than 95 percent of the irrigation is located.
The 4 000 year old Indus civilization has its roots in irrigated agriculture. Canal irrigation development began in 1859 with the completion of the Upper Bari Doab Canal (UBDC) from Madhopur headworks (now in India) on Ravi river. Until that time, irrigation was undertaken through a network of inundation canals, which were functional only during periods of high river flow. These provided water for Kharif (summer) crops and residual soil moisture for Rabi (winter) crops. The last inundation canals were connected to weir-controlled supplies in 1962 with the completion of the Guddu barrage on Indus river (barrages in the IBIS are constructed to divert river water into canals and the storage capacity is insignificant).
UBDC was followed by Sirhind canal from Rupar headworks on Sutlej in 1872 (also in India) and Sidhnai canal from Sidhnai barrage on Ravi in 1886. The Lower Chenab from Khanki on Chenab in 1892, and Lower Jhelum from Rasul on Jhelum in 1901 followed. Lower and Upper Swat, Kabul river and Paharpur canals in Khyber Pakhtunkhwa were completed during 1885 to 1914.
In the beginning of the 1900s, it became apparent that the water resources of the individual rivers were not in proportion to the potential irrigable lands. Ravi river, serving a large area of Bari Doab, was low in supply while Jhelum had a surplus. An innovative solution was developed in the form of the Triple Canal Project, constructed during 1907-1915. The project linked the Jhelum, Chenab and Ravi rivers, allowing a transfer of surplus Jhelum and Chenab water to the Ravi. The Triple Canal Project was a land-mark in integrated inter-basin water resources management and provided the key concept for the resolution of the Indus waters dispute between India and Pakistan in 1960.
The Sutlej Valley Project, comprising four barrages and two canals, was completed in 1933. This resulted in the development of the unregulated flow resources of the Sutlej river and motivated planning for the Bhakra reservoir (now in India). During the same period, the Sukkur barrage and its system of seven canals, serving 2.95 million ha in the Lower Indus, were completed. These are considered to be the first modern hydraulic structures on the downstream Indus river. Haveli and Rangpur from Trimmu headworks on Chenab in 1939 and Thal canal from Kalabagh headworks on the Indus were completed in 1947. This comprised the system inherited by Pakistan at the time of its creation in 1947.
At independence, the irrigation system, conceived originally as a whole, was divided between India and Pakistan without considering the irrigated boundaries. This resulted in the creation of an international water dispute in 1948, which was finally resolved by the enforcement of the Indus Water Treaty in 1960 under the aegis of the World Bank. The Indus Basin Project (IBP) including Mangla dam, five barrages, one syphon and eight inter-river link canals, was completed during 1960-1971, while Tarbela dam started partial operation in 1975-1976.
After the partition, Kotri, Taunsa and Guddu barrages were completed on the Indus river to provide controlled irrigation to areas previously served by inundation canals. The Taunsa barrage was completed in 1958 to divert water to two large areas on the left and right banks of the river. This made irrigated agriculture possible for about 1.18 million ha of arid landscape in Punjab province. Currently rehabilitation and modernization of the barrage is in progress. Also, three additional inter-river link canals were built prior to the initiation of the IBP.
As a result of these extensive developments Pakistan now possesses the world’s largest contiguous irrigation system. It commands 14.87 million ha (2008) and encompasses the Indus river and its tributaries including three large reservoirs (Tarbela, Mangla, and Chashma), 23 barrages/headworks/siphons, 12 inter-river link canals and 45 canals commands extending for 60 800 km with communal watercourses, farm channels, and field ditches covering another 1.6 million km to serve over 90 000 farmer-operated watercourses. In the Indus system, river water is diverted by barrages and weirs into main canals and subsequently branch canals, distributaries and minors.
The flow to the farm is delivered by over 107 000 watercourses, which are supplied through outlets (moghas) from the distributaries and minors. The mogha is designed to allow a discharge that self-adjusts to variations in the parent canal. Within the watercourse command (an area ranging from 80 to 280 ha), farmers receive water proportional to their land holding. The entire discharge of the watercourse is given to one farm for a specified period on a seven day rotation. The rotation schedule, called warabandi, is established by the Provincial Irrigation and Power Department, unless the farmers can reach a mutual agreement.
All cotton, rice, sugarcane, fodder, maize grain, fruits, vegetables, freshwater fisheries, dairy livestock are grown under irrigated conditions, and 90 percent of the wheat area is irrigated. Coarse grains, pulses, groundnut, sorghum and millets are normally rainfed or spate irrigated. Around 10 percent of the wheat area is rainfed,contributing only 5 percent of wheat production. Wheat, pulses and coarse grains are spate irrigated. Recession agriculture is also practiced around the rivers and streams during floods; after receding of floodwater the crops are grown.
In 2008, the total harvested irrigated cropped area was about 21.45 million ha (Table 4 and Figure 5). The major irrigated crops are wheat, rice, sugarcane, cotton and fodder. These crops are almost 78 percent of the total harvested area and consume 82 percent of the total available water resources. The area under these crops is 16.60 million ha, of which 7.33; 2.52; 1.24; 3.05 and 2.46 million ha for wheat, rice, sugarcane, cotton and fodder, respectively (GoP, 2008a).
Full control irrigated agriculture provides 90 percent of wheat and small grains besides nearly 100 percent of sugarcane, rice, cotton, fruits and vegetables, whereas the Barani (rainfed) and Sailaba (spate irrigation) areas contribute only 10 percent of wheat and a portion of small grains and pulses. It also provides milk, meat and fuelwood besides crops (Ahmad, 2004a; Ahmad, 2004b; Ahmad, 2008a; GoP, 2008b). The average yield of irrigated wheat, rice, sugarcane, cotton and fodder is 2.5, 2.2, 51.5, 0.65 and 22.4 tonnes/ha respectively (GoP, 2008a).
In 2008, the average cost of irrigation development in public schemes was an estimated US$1 300/ha, while the cost of drainage development was aroundUS$2 650/ha. The average cost of operation and maintenance (O&M) is US$65/ha per year. The average cost of sprinkler and irrigation for on-farm installation is US$1 500/ha and US$1 750/ha respectively.
When the IBIS was developed, the drainage needs were initially minimal. Water tables were deep and irrigation water supplies were too low to generate much groundwater recharge and surface water losses. Whatever little drainage was required, could readily be accommodated by the existing natural drainage. The drainage needs, however, have increased as more irrigation water has been diverted and the water table has risen to harmful levels causing waterlogging and salinity. The drainage systems were developed over the last 30-40 years (Bhutta and Smedema, 2005).
Drainage and reclamation programmes to mitigate waterlogging and salinity, especially in areas where the water table is 0-1.5 m deep, have been assigned priority. Under the Salinity Control and Reclamation Projects (SCARPs), a disastrous area of 1.97 million ha (with a water table at 0-1.5 m) was reclaimed through rehabilitation of existing drains and investments for the new drainage schemes. Surface drains were also constructed in areas where surface runoff resulted from rainfall or excess irrigation. To encourage private sector participation in drainage, SCARP tubewells were transferred from the public to private sector. Tile drainage was given due attention. The current situation of the waterlogged area shows that the area at risk (with a water table at less than 1.5 m) comprises 12 percent of the total irrigated area. About 1.06 million ha of this area at risk has been covered under various SCARPs. During the current decade, an area of 1.21 million ha was reclaimed under drainage projects such as LBOD, RBOD-I, II and III, Drainage-IV and the National Drainage Programme with the installation of 1 260 drainage wells, transitioning of 5 000 public tubewells, construction or rehabilitation of 2 200 km of open drains, and laying of tile drainage system in 146 500 ha (MTDF 2005).
In 2008, the total drained area equipped for irrigation, was approximately 15.14 million ha.
Water is a federal subject, for which the following federal institutions are responsible:
Irrigation and drainage are handled at the provincial level. The Provincial Irrigation and Drainage Authorities (PIDAs) are the custodians of the irrigation networks in association with the Area Water Boards (AWB). These institutions carry out O&M and the distribution of water within the province and to design and develop new irrigation and drainage schemes. The PIDA experiment is still in its infancy, the Provincial Irrigation Departments (PIDs) are still active, as the responsibility and authority has not yet been transferred to the AWBs.
The Farmers’ Organizations (FOs) were registered during the early twentieth century. The Institutional Reforms for the water sector, the Provincial Irrigation and Drainage Authority Acts authorized the PIDAs to form and register the FOs at the distributary canal level. At the provincial level the FOs have been established in the selected AWBs. The FOs are responsible for collecting the water fee.
Along with the FOs, the first Water User Associations (WUA) were created in 1981 under the World Bank-supported On-Farm Water Management Programme. These were formed at the watercourse level, with the primary objective of rehabilitating the watercourses. Currently around 80 000 WUAs have been formed that have participated in the rehabilitation and lining of the watercourses.
Environment institutions have been established within most of the organizations besides the federal and provincial Environmental Protection Agencies (EPAs) to address issues related to field level activities. The regulatory and legal aspects of pollution control are being implemented by the EPAs.
The government of Pakistan has undertaken a National Project on the Improvement of Watercourses”to improve 88 000 watercourses costing Pakistani Rupees 66 billion (about US$0.8 billion in 2009) and cost sharing of 70:30 percent, where 70 percent is contributed jointly by the federal and provincial governments and 30 percent by farmers. Since 2007 the federal government has been funding a National Programme for Water Conservation for Productivity Enhancement using High Efficiency Irrigation System. A subsidy of Pakistani Rupees 90 000/ha (US$1 070/ha in 2009) is provided jointly by the federal and provincial governments and the rest by the farmer. Private sector service and supply companies have been registered in to provide ‘turn-key’ installation of sprinkler and drip irrigation systems. Recently, this project has been transferred to PARC owing to the extremely slow progress.
The public sector operates the irrigation systems above the moghas (turnout). Each season, the Water and Power Development Authority (WAPDA) of the Federal Government estimates water availability for the following season. The Provincial Irrigation Departments (PID) inform the WAPDA of provincial water demands at specific locations. The WAPDA releases water from the reservoirs to meet demands as closely as possible. The limited reservoir capacity of the systems does not allow the full regulation of rivers for irrigation.
Farmers use groundwater to irrigate their fields at peak demand owing to scarcity of water and shortages imposed resulting from fixed rotation and the continuous flow irrigation system, which is too rigid to meet crop-water demands. The water distribution system is based on a rotation schedule, called Warabandi (7-10 days rotation), and water is supplied equitably to farmers on a fixed rotation; inequity arises from the inefficiency of water conveyance (Ahmad, 2008a).
An agreement was reached in March 1991 between the provinces on the apportionment of the Indus water to replace a much older agreement. The new agreement has released the provincial canal systems from the need to be operating at all times so as to protect or establish future rights. Now that the supplies have been apportioned, including the formula for sharing any surplus river flows, the provincial systems are free to move toward more efficient water use.
O&M expenditure is collected by levying water charges and/or drainage taxes. In Punjab and Khyber Pakhtunkhwa, water charges are assessed by the Provincial Irrigation Departments (PIDs). In Sindh and Balochistan, they are assessed by the Provincial Revenue Department (PRD). Water and drainage charges are not linked to O&M needs. They are collected in all regions by PRD, and are deemed to be part of provincial revenues. The gap between O&M expenditures and recoveries through water charges is high (44 percent) and increasing. The difficulties faced in cost recovery have resulted in very poor O&M which, together with deliveries at less than the designed levels and illegal diversion, has led to major inequalities in the distribution of water. In reality, water often does not reach the tail-end users, which can partly explain the increasing groundwater extraction.
The FOs are responsible for collecting the water fee. They retain 40 percent for O&M at the distributary canal level and deposit 60 percent with the AWB for upstream O&M.
The IBIS is the largest infrastructural enterprise accounting for about US$300 000 million investment (at current rates).
Since 2005, the Draft National Water Policy is still in the process of being approved. The Pakistan Water Strategy was prepared during 2001, which is the basic document for water development and management. Further, there is no formal Agriculture Policy; although policy decisions have been made on a case-by-case basis. The only approved Integrated Water Resources Management Policy is for Balochistan province.
The 1967 Land Reform Act established a register of rights, which is a cadastral register for land and water rights.
Water quality of the Indus river and its tributaries is excellent. Total dissolved solids (TDS) range between 60-374 ppm (parts per million), which is safe for multiple uses (Bhutta, 1999; PWP, 2000). TDS in the upper reaches range between 60 ppm during high-flow to about 200 ppm during low-flow. Water quality deteriorates downstream but remains well within permissible limits, with TDS in the lower reaches of the Indus (at Kotri Barrage) ranging from 150 to 374 ppm. TDS of some of the tributaries such as Gomal River at Khajuri, Touchi River at Tangi Post and Zhob River at Sharik Weir range between 400 to 1 250 ppm (IWASRI, 1997). The quality of the groundwater is marginal to brackish in 60 percent of the IBIS aquifer. The groundwater quality in the area outside the IBIS varyies, depending on recharge (Ahmad, 2008a; Ahmad, 2008b).
Indiscriminate and unplanned disposal of effluents, including agricultural drainage water, municipal and industrial wastewater, into rivers, canals and drains is causing deterioration of water quality downstream. In 1995 around 12.435 km3/year (9 000 million gallons/day - 1 gallon = 4.5 litres) of untreated water were being discharged into water bodies (Ahmad, 2008b). It was estimated that 0.484 and 0.345 km3/year (350 and 250 million gallons/day) of sewage was produced in Karachi and Lahore metropolitan areas and most of it was discharged untreated into water bodies. The polluted water is also being used for drinking in downstream areas causing numerous water-borne diseases.
Quality of groundwater varies widely, ranging from < 1 000 ppm to > 3 000 ppm. Around 5.75 million ha have underlying groundwater affected by salinity < 1 000 ppm, 1.84 million ha with salinity ranging from 1 000 to 3 000 ppm and 4.28 million ha with salinity > 3 000 ppm. In addition to TDS, water quality concerns are related to the sodium adsorption ratio (SAR) and residual sodium carbonate (RSC) (WAPADA 2006).
Use of pesticides and nitrogenous fertilizers seriously affects shallow groundwater and entry of effluents into rivers and canals is deteriorating the quality of freshwater. Almost all shallow freshwater is polluted with agricultural pollutants and sewage (Ahmad, 2008a; Ahmad, 2008b).
Investments in drainage have been significant during the last two decades, though waterlogging still affects large tracts of land. Soil salinity and sodicity also constrain farmers and affect agricultural production. These problems are further exacerbated by the use of poor quality groundwater (Kijne and Kuper, 1995). In fresh groundwater areas, excessive pumping by tubewells leads to mining and redistribution of groundwater quality (WRRI, MONA and IIMI, 1999).
Waterlogging in the IBIS has been high in the 1990s because of heavy floods. Early in the 2000s, droughts resulted in lowering of the water table and in reduction of the waterlogged area. The overall analysis shows that there is no change in waterlogging. Currently, waterlogged and saline areas are around 7 million ha. During the late 1990s most of the SCARP tubewells were abandoned and farmers were provided support to install shallow tubewells (Zaman and Ahmad, 2009).
Climate change is also expected to significantly affect agriculture. Potential impacts include vulnerability of crops to heat stress, possible shifts in spatial boundaries of crops, changes in productivity potentials, changes in water availability and use, and changes in land-use systems. Even a fractional rise in temperature could have serious adverse effects, such as considerable increase in growing degree days (GDD, which is a measure of heat accumulation used to predict the date that a flower will bloom or a crop will reach maturity). This could not only affect the growth, maturity and productivity of crops, but would also require additional irrigation water to compensate the heat stress (Afzal, 1997).
The quality of shallow and deep groundwater can adversely impact human and animal health. Around 25 percent of all illnesses diagnosed at public hospitals and dispensaries are gastro-enteric and 40 percent of all deaths, 60 percent of infants’ deaths are related to infections and parasitic diseases, most are water-borne. The most common diseases are diarrhoea, dysentery, typhoid, hepatitis, kidney stones, skin disease and malaria.
HIV is not currently a dominant epidemic in Pakistan; however, the number of cases is growing. The World Health Organization (WHO) estimates indicated that the number of HIV/AIDS cases were around 97 000 ranging from the lowest estimate of 69 000 to the highest estimate of 150 000. The overall prevalence of HIV infection in adults aged 15 to 49 is 0.1 percent. The majority of cases go unreported because of social taboos about sex and victims’ fears of discrimination. On the other hand, over 900 individuals receive free HIV medicines and tests from nine public and three private sector facilities (WHO, UNAIDS and UNICEF, 2008).
The prospects for agricultural water management are:
The prospects for agricultural water management are:
The population is increasing and he agriculture sector must grow at a rate of over 4 percent per year. This target will be achieved with improved performance of existing irrigation schemes and enhanced productivity. This is because new water resources are more difficult to access; the development of large dams, will require at least 10 years before they can be completed. Future growth in agriculture will directly impact groundwater and surface water streams, owing to expanded use of chemicals. As people’s diet changes and they increase their consumption of dairy products, meat, fruits and vegetables, the sector will face new challenges for water use. Policy support is required to covert agriculture into a profit-oriented enterprise.
ADB (Asian Development Bank). 2003. Preparing for decisions on land use & forestry, Pakistan Report. Paper presented at workshop on forests and climate change, 16 – 17 October 2003, at COP9 Traders Hotel, Manila, Philippines, Asian Development Bank 2003.
Afzal, M. 1997. Global agenda for livestock research, Pakistan paper. Proceedings of a consultation on setting livestock research priorities in West Asia and North Africa (WANA) Region. 12–16 November 1997, International Center for Agricultural Research in the Dry Areas. Aleppo, Syria.
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