Document Type : Research Article

Authors

1 Khorasan Razavi Agricultural and Natural Resources Research and Education Center

2 Zabol

3 Ferdowsi university of mashhad

Abstract

Introduction Sustainable use of groundwater resources has been a concern of the past half century. Although a number of countries for many years have considered this issue, in Iran despite experts warning in the past two decades, recently has been highly regarded, especially by public officials. The use of modern irrigation systems by improving water distribution at the level of the farm and reduce the outflow of water from plant availability, improve irrigation efficiency but these systems increase evaporation and transpiration, and even in the event of a reduction of extraction water from wells, may not be effective in balance of the groundwater resources. The government of Islamic Republic of Iran, yearly pay a lot of subsidies (85% of total cost), to increase irrigation efficiency by equipping traditional culture to new irrigation systems. It may increase irrigation efficiency but may not improve balance of the groundwater resources. However, increasing irrigation efficiency in the process of conveyance, distribution, and application of water, improve groundwater balance, and reduce energy consumption, but costs, benefits and its impacts on balance of the groundwater resources are various in each step. so, technical and economic effects of each step and determining the priority of them, were the objectives of this study.
Materials and Methods In order to carry out this study, five cities include Mashhad, Sabzevar, Neyshabour, Torbat-e-jam and Torbat-e-heidarieh were selected. These areas are located in Khorasan Razavi in north east of Iran with average annual rain 200-250 millimeter. The mathematical relationships between extracted water from underground and surface resources and transfer it to farms as well as water influence to groundwater source and the rate of consumption in the fields and orchards were simulated in the excel spreadsheet. Data were collected by using questionnaires and interviews with farmers in the study area in the crop year 2012-2013. Additional data were collected from government documents in ministry of agriculture, energy and regional office. A multi scenario was simulated include 1-Increase the conveyance and distribution efficiency, CDE, to 95 % via transform dirty channel into the pipe. 2-Substitute pressurized irrigation systems instead of traditional system.3-Combining scenario one and two together. 4- Increasing irrigation application efficiency, IAE, to 75% in modern system in scenario three. 5-Increasing irrigation application efficiency, IAE, to 85% in modern systems in scenario three. 6- Execute scenario one and increasing area of irrigation modern systems to dual of initial forecast (only in Sabzevar until 1.5times). These scenarios also evaluated economically. In economic evaluation, increase of yield, between 10-40 percent as 4 scenarios separately, and reduce energy subsidies include increase power price to 2 times, and three kinds of cost price of power was considered.
Results and Discussion Average of CDE were obtained various between 57-78% in study area. The share of agricultural activity in reduce of groundwater source was 20% and most of area was encountered with low irrigation in warm seasons until to 50%. The most impact in creating balance in groundwater resources belonged to increase of CDE by first scenario and was quite economical. The most reduction on groundwater deficit can happen by scenario 5. However, in Torbat-e-jam and Torbat-e-heidarieh, groundwater deficit will continue unless the culture areas are reduced. Increasing IAE, is more effective than developing culture area of the pressurized irrigation systems, CAPIS, for example, in Sabzvar, increasing of IAE by 12% (scenario four), will reduce groundwater deficit 164% but increasing CAPIS, to 50%( scenario 6), will reduce groundwater deficit only 113%. Increasing CAPIS, with 30% increase in yield, make scenario three economical, but increase electrical energy and so, increase national cost by increasing subsidy of energy. First scenario, reduce consumption of electric power, so its benefit cost ratio will increase because reduce government cost but scenario two, increase consumed electrical energy. In the Sabzevar city power consumption in the first scenario was more than 176 million Kilowatt, which reduces farmers' spending by more than 23 billion IRR, But in the second scenario, energy consumption is rising by more than 25 million kilowatts. So, its benefit cost ratio will decrease if government reduce power subsidy. As a result, this scenario without increase of IAE and yield, will not be economical. In all city except Sabzevar with the increasing yield by 20 percent, all scenarios will be economical, also in all city, with omission of the power subsidy, scenario 2 will be uneconomical, so the government is forced to grant subsidies to expand new irrigation systems. The city of Sabzevar, which has the longest route for pipelines (about 42%), requires an initial investment of 695 billion rials, with investment of 1079 billion IRR needed to equip 15342 hectares of land to modern systems. Therefore, the first scenario, although having more economic benefits, requires a relatively small amount of investment as well. Regarding the energy cost of between 680 and 7300 Rls, a number of government payments with the implementation of the first scenario is reduced from 96 to 1263 billion rials yearly, while the total initial capital required to realization of the goal is 695 billion rials, which is estimated at 70 billion rials, annually.
Replacing the irrigation modern systems instead of traditional systems without reducing the gap between the current and potential IAE, had a little impact on the groundwater balance, and to consider energy subsidies, is in conflict to national benefits.
Conclusions Installation of volumetric meters and tubing for water transmission and distribution channels should be used in preference to increase the efficiency of irrigation, reduce energy consumption and water extraction from wells, protection of saving water, and prevention of increase in cultivation. In order to increase the water application efficiency and production, implementation of modern irrigation systems on farms and gardens should be accompanied by adequate supervision and training.

Keywords

1- Abbasi F., Naseri A., Sohrab F., Baghani J., Abbasi N., and Akbari M. 2015. Improvement of Water Use Efficiency. Agricultural Research, Extension and Education Organization, Agricultural Engineering Research Institute. (in Persian)
2- Ahmad, M.-u.-D., Turral, H., Masih, I., Giordano, M., and Masood, M. (2007). Water Saving Technologies: Myths and Realities Revealed in Pakistan's Rice-Wheat Systems. IWMI-International Water Management Institute.
3- Alizadeh H.A., Liaghat A., and Sohrabi T. 2014. Assessing pressurized irrigation systems development scenarios on groundwater resources using system dynamics modeling. Journal of Water and Soil Resources Conservation, 3(4):1-14. (in Persian with English abstract)
4- Baghani J. 2008. Comparative effects of drip and furrow irrigation on the amount and water use efficiency and yield in row crops. Iranian Journal of Irrigation and Drainage, 2(2):11-18. (in Persian with English abstract)
5- Baghani J., Rastegar J., Zare Sh., and Sadreghaien S.H. 2012. Effects of irrigation systems on quantity and water use efficiency of onion cultivars. Iranian Journal of Irrigation and Drainage, 6(1):1-10. (in Persian with English abstract)
6- Baghani J., Zare Sh., and Joleini M. 2010. The Affectivity of New Irrigation Systems on Ground Water Resources, Yield and Water Use Efficiency in Mashhad Plain. Agricultural Research, Extension and Education Organization, Agricultural Engineering Research Institute. (in Persian with English abstract)
7- Banks J., Carson, J. S., Nelson, B. L., and Nicol, D. M. 2005. Discrete-Event System Simulation, Pearson Education.
8- Chen S., Yang W., Huo Z. and Huang G. 2016. Groundwater simulation for efficient water resources management in Zhangye Oasis, northwest China. Environmental Earth Sciences, 75(8):1-13.
9- Endo T. 2015. Groundwater management: a search for better policy combinations. Water Policy, 17(2):332-348.
10- Erfanian M., Alizadeh A., and Mohammadian A. 2011. An Investigation on the Possible Differences between Present Crops Water Requirements and National Documents of Irrigation. Iranian Journal of Irrigation and Drainage, 4(3):478-492. (in Persian with English abstract)
11- Hajipour M., Zakerinia M., Ziaee A.N., and Hesam M. 2015. Water demand management in agriculture and its impact on water resources of Bojnourd basin with WEAP and MODFLOW models. Journal of Water and Soil Science, 22(4): 85-101 (in Persian with English abstract)
12- Hu Y., Moiwo J.P., Yang Y., Han S. and Yang Y. 2010. Agricultural water-saving and sustainable groundwater management in Shijiazhuang irrigation district, north China plain. Journal of Hydrology, 393(3):219-232.
13- Jabbari P., Ghanbarpour M.R., and Ashbeh A.R. 2009. Assessment and determination of ground water balance of Srai Neka plain. P. 1-12. Proceedings of the. 5th National Conference on Watershed Management Science and Engineering of Iran, 23-24 Apr. 2009. Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran. (in Persian)
14- Jihad agriculture organization of khorasan Razavi. 2015. Khorasan Razavi statistical Yearbook of agriculture 2014. Economic and Planning Adjutancy, Information and Statistic office, Mashhad. (in Persian)
15- Kellner M.I., Madachy R. J. and Raffo D.M. 1999. Software process simulation modeling: Why? What? how?. Journal of Systems and Software, 46(2):91-105.
16- Mao X., Jia J., Liu C. and Hou Z. 2005. A simulation and prediction of agricultural irrigation on groundwater in well irrigation area of the piedmont of Mt. Taihang, north China. Hydrological processes, 19(10):2071-2084.
17- McKinney D.C. and Savitsky A.G. 2006. Basic Optimization Models for Water and Energy Management. The University of Texas at Austin, Thechnical Repor. Available at http://www.ce.utexas.edu/prof/mckinney/ce385d/lectures/McKinneySavitsky_ver8_e.pdf (visited 1 April 2015).
18- Ministery of energy. 2004. Instruction Underground Salt-Water Balance. Iran Water Resources Management Company, Research and Basic Studies Adjutancy, Standard and Technical Criteria Office,Tehran. (in Persian)
19- Ministery of energy. 2013. An Overview of the Water and Electicity Industry from Aspects of Cost Price, Sale Price, Resource, Consumption and Investment. Tehran. (in Persian)
20- Ministery of energy. 2014. Province Water Feature. Regional Water Company of Khorasan Razavi, Planning and Management Improvement Adjutancy, Mashhad. (in Persian)
21- Nazarifar M., Momeni R., and Mollaei M., 2006. Applying model OPDM in determining cropping pattern in low irrigation condition. P. 1-7. Proceedings of the 1st Irrigation and Drainage Network Management National Conference, 2-4 May. 2006. Shahid Chamran University of Ahvaz, Ahvaz. Iran. (in Persian)
22- Palouch M. 2014. Break Forward, Approach of Water Crisis-Stricken Management in The Country. Agricultural Planning, Economic and Rural Development Research Institute, Tehran. (in Persian)
23- Pfeiffer, L. 2009. Three Essays on the Economics of Groundwater Extraction for Agriculture: Property Rights, Externalities, and Policy. Unversity of California, Davis.
24- Saadati H., Ismaili A., Sharifi F., Mahdavi M., and Ahmadi H. 2009. Estimating groundwater recharge and storage volume changes of Hashtgerd plain by water balance and chemical detection. P. 1-11. Proceedings of the. 5th National Conference on Watershed Management Science and Engineering of Iran, 23-24 Apr. 2009. Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran. (in Persian)
25- Salehi Fathabadi, H. 1986. Simulation of systems by digital computer, Jahad daneshgahi. Tehran. (in Persian)
26- Salemi H.R., and Sepaskhah A.R. 2006. Estimation of canal seepage loss in Rudasht region of Isfahan. Journal of Water and Soil Science, 10(1): 29-43. (in Persian with English abstract)
27- Shah, T., Bhatt, S., Shah, R. and Talati, J. 2008. Groundwater governance through electricity supply management:Assessing an innovative intervention in Gujarat, western India. Agricultural Water Management, 95(11):1233-1242.
28- Shahrokhnia, M.A., Zare, E. 2014. Technical and Economical Evaluation of Seepage in Darab Irrigation Canals. Iranian Journal of Irrigation and Drainage, 8(1):44-52. (in Persian with English abstract)
29- Singh, A. 2014. Groundwater resources management through the applications of simulation modeling: a review. Science of the Total Environment, 499:414-423
30- Statistical center of Iran. 2015. Iran Statistical Yearbook 1392 [March 2013-March 2014]. Presidency, Management and Planning Organization, Statistical Centre of Iran, Tehran.
31- Velayati S.A. 2006. An investigation on the water crisis in Khorasan province. Modarres Human Sciences, Special Issue Geography, 10(tome 48):213-234. (in Persian with English abstract)
32- Ward, F. A. and Michelsen, A. 2002. The economic value of water in agriculture: concepts and policy applications. Water Policy, 4(5):423-446.
33- Ward, F. A. and Pulido-Velazquez, M. 2008. Water conservation in irrigation can increase water use. Proceedings of the National Academy of Sciences, 105(47):18215-18220.
34- Zolfagharan A., and Karimi M. 2012. Problems of development of pressurized irrigation systems in the country. 1-4. Proceedings of The 1st National Conference on Solutions to Access Sustainable Development in Agriculture, Natural Resources and the Environment, 10 Mar. 2013. Ministry of Interior, Tehran, Iran. (in Persian)
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