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ghazi52

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Spate irrigation prospects in Pakistan

Khuram Mubeen

Assistant Professor Agronomy MNS University of Agriculture, Multan.

On an average 9% of the irrigated area of Pakistan is under the system of hill ********. Though there is a potential of increasing the area under spate irrigation up to 34%.






Floods are often considered as havoc. However, the other side of coin has seldom been accounted for in a positive context. Rain water from dry mountains can be a potential source for irrigating low lying fields, and getting a reasonable crop production.

Floods in plains through rise in level of river flow and floods originating from mountainous areas (Hill ******** / Rod Kohi) differ from each other. The floods from rivers builds gradually, has a long lasting impact and recedes even more slowly.

On the other hand, hill ******** from mountains are transient (usually up to 10 hours) and appear shortly after rains. Speed of water flow is very high as compared to floods of rivers in plains.

What is spate irrigation?


The irrigation technique that diverts flood water from dry mountainous area by gravity through regulatory structures for crop cultivation in low lying farmland is referred to as spate irrigation. This irrigation system is a distinct feature of arid and semi-arid regions bordered by highlands.

There are two systems of management in hill torrent areas:

  1. Upland rod kohi areas. Here check dams are built to create obstacles in the movement of speedy water. It aids in reducing losses to soil erosion. Contouring, terracing is practiced and mini dams are also constructed. Medium reservoirs can also be built where feasible.
  2. Lowland rod kohi areas: In such areas regulatory structures, diversion bunds, headworks, field inlets and field outlets can be constructed. For smooth flow of water and to avoid erosion, water can be conveyed through an array of channels like stone masonry lined channels, closed channels, parabolic lined channels, plastic sheet lined channels and open channels etc. A well planned channelization of the water from river bed at the take-off point will make the most use of the area with better coverage and spread of water with effective groundwater recharge.
On an average, currently 9% of the irrigated area of Pakistan is under the system of hill ********. Though there is a potential of increasing the area under spate irrigation up to 34%. About 1.4 to 2.34 million hectare area is under spate irrigated agriculture. Nevertheless, the potential area is approximately 7 million hectares.


Following three aspects must be inculcated to harvest the benefits from hill..


  1. Building regulatory structures
  2. Canal maintenance and repair system
  3. Management of commanded area of the hill ********

Essential aspects to harness hill

Building dams, mini dams, headworks, regulatory structures etc. is the major responsibility of engineering authorities whereas command area management is a diverse subject involving multiple stakeholders. The bund repair and maintenance in such areas is of utmost importance.

In some areas, there is penalty on farmers who do not take care of repairing and maintaining bunds on annual and sometime on seasonal basis. Moisture conservation can be enhanced by ploughing, surface mulching, strip cropping, and growing cover crops like legumes etc.

Pakistan’s scenario

Pakistan has the largest area in the world under spate irrigation with maximum area being in Balochistan. In Punjab, this sort of irrigation is practiced in districts of Dera Ghazi Khan and Rajanpur and parts of Mianwali. There are 13 major hill ******** besides many minor ******** locally called “chur”.

In Khyber Pakhtunkhwa spate irrigation is practiced in Dera Ismail Khan and parts of Lakki Marwat and Kohat. In Sindh, it is mostly practiced in the northwestern Kirthar range along Dadu, Jamshoro and reaching up to part of Karachi district. There are 25 hill torrent systems in Sindh. Balochistan has 44% area of the country by geography.

However, only 13% area of Balochistan is irrigated. There are 19 major spate irrigation systems in Balochistan.
Government through irrigation department has established hand pumps for drinking water in some villages but still in many areas the human and animals drink water from the ponds or from water collected in depressions made by soil transportation and erosion.

Water rights are not followed in their true essence in most of the spate irrigated areas. If in dry years, a small volume of water is received through rainfall, the farmers at upstream have the rights to use it. But as a malpractice, influential people and those at upstream divert the water flow during wet years to their lands which results in non-availability or very limited water availability to farmers at tail of the command area.


Traditionally, at field level, tactical breaching of field bunds is done for field to field irrigation. However, it damages the bunds sometimes besides several other adverse ecological and social impacts.


Field management

On field management include selection of suitable crop and cultivars which require less water till maturity and can withstand dry spells and hot weather in summer. Sorghum and millets can be successfully grown and seeds of these crops are threshed at harvest for future use while their stalks can be dried for hay to feed livestock.

Mulching, tillage, strip cropping, using leguminous crops in the cropping system improves soil conditions and soil moisture holding capacity. Millet, cluster bean and mungbean is used in different areas in summer. In winter season chickpea, rapeseeds, mustards and wheat are mostly grown in different areas.

Dug well irrigation is also in practice in some areas like Mithawan hill torrent command area.
As the farmers do not use external inputs in subsistence farming; therefore, the returns from the field crops are also marginal.


Problem solution
  • There is a need to build a database of spate irrigation in the country. Currently, there is very little academic research regarding key aspects of spate irrigation. Wherever feasible, spate irrigation should be augmented with judicious groundwater use.
  • Improvement in indigenous vegetables, trees and fodder should be included in research program for improving the intended benefits. In most of the areas as the produce from the fields are obtained without using any chemical, there is a huge potential for developing commodity specific organic markets.
  • Thal and Cholistan Development Authorities, rod kohi development authorities on at least province level should be initially established having experts from disciplines of agriculture, livestock, health, forestry and education etc. There should be concrete efforts for promoting the focus on fodder, pulses, oilseeds and wheat etc. using available water supply.



Scientific solutions

  • Research should be focused on breeding crop cultivars that can extract water from deeper soil depths.
    Creating awareness and coordination among all the society groups is need of the time. On farm water management through active involvement of irrigation, engineering, conservation, agriculture and extension departments etc. can bring a significant change.
  • Research should also be focused on developing drought tolerant fruit plants like Beri and Dates. There is potential of planting more forest trees in spate irrigated areas. This will also reduce the soil erosion and avoid negative consequences of climate change besides other benefits.
  • Low cost drinking water technologies for humans and livestock consumption should be taken into account on priority basis. As the area is drought prone with water scarcity, hence growing crops through high efficiency irrigation systems like drip irrigation can bring fruitful results where applicable.
  • Engineering and agricultural faculties of universities should incorporate spate irrigation curriculum for capacity building and preparing scientific brains in future perspective. It is of utmost importance to include spate irrigated area into national development plan.
An integrated approach unveiling all these aspects will definitely promise uplift in the socio-economic lives of poorest of the poor farmers in country.
 

ghazi52

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Mohmand dam

The Mohmand dam is being developed approximately 48km north of Peshawar at the intersection of Mohmand and Charsadda district.

The Mohmand Dam project will include a 213m-high concrete-faced rock-filled dam and two 3,317m-long low-level river diversion outlets with a diameter of 15m. The dam will feature seven radial gates with a width of 15m and height of 21m.

The reservoir will have a storage capacity of 1,594 million cubic metres (Mcm). It is expected to provide irrigation, drinking water facilities, and electricity generation. Peshawar city will receive 13.32Mcm of water upon completion of the project.

Mohmand dam will also irrigate 16,737 acres of cultivable area The left bank will cultivate 9,017 acres and the right bank will cultivate 7,720 acres.
 

ghazi52

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The federal government is providing funds for the construction of 60 small, medium, large and recharge dam projects in the country through Federal Public Sector Development Programme (PSDP) aimed at providing water for irrigation and drinking purposes.

According to sources privy to the information, the accumulative live storage capacity of these dams was about 8,683,699 acre-feet whereas as many as 17 dams’ projects were likely to be completed during the current fiscal year (FY).

Some of the projects include small dams in Tehsil Dobandi, Gulistan Killa, Bhundaro storage dam, Dosi dam Pasni, Darah dam Khuzadar, Mangi dam Quetta, Mara Tangi dam Loralai, Tuk dam Tehsil Wadh, Anjeeri dam Nushko, Azdhakhoi dam, Baghi dam Naushki, delay actions dams in Siaro Hazar Ganji Nal, a small dam at Sardari Goz Darkhalo, small dam Kunji Ferzabad, and Sukleji dam etc.

Work on other projects including Mohmad, Diamer Basha, Kurram Tangi, Nai Gaj and Naulong dams was also being carried out.

Sources said it was a fact that per capita water availability in Pakistan which in 1951 was 5,260 m3 per annum, was constantly decreasing and at present had reduced to less than 1,000 m3 per annum per capita due to an ever-increasing population.

They said that WAPDA has prepared a comprehensive plan to address water scarcity issue by storing flood water during high flow season and utilise the same during the lean season.

In last decade, WAPDA completed Mangla Dam Raising (2.88 MAF), Gomal Zam Dam (0.892 MAF), Satpara Dam (0.053 MAF) and Darawat Dam (0.089 MAF) for water storage.

Now, the authority was also planning to construct Kurram Tangi Dam Stage-II (0.90 MAF), Chiniot Dam (0.85 MAF), Shyok Dam (5.0 MAF), Akhori Dam (6.0 MAF), Dudhnial Dam (1.00 MAF), Skardu Dam (3.20 MAF) and Sindh Barrage (2.00 MAF) to cope with the issues of water shortage in the country.



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