This study concerns the determination of the technical
efficiency of irrigation associations (IAs) located in the Gediz Basin in
Turkey. For this purpose, 10 IAs operating in the Gediz Basin were evaluated
with the use of input oriented DEA model which considers two inputs: water
volume supplied (m3) and total irrigated area (m2), and
one output: the total value of agricultural production (TL). The assurance
region approach was used in DEA not only to include the decision makers’
preferences into the analysis, but also to limit the inappropriate input/output
weights that may affect the efficiency scores. The IAs were evaluated during
the period 2009-2011 to conclude the variation of efficiency over the study
years. The results showed that, during the study period there was an increment
in the number of efficient irrigation districts from 3 to 6. However, Gediz,
Mesir and Salihli Right Bank IAs were not able to increase their low efficiency
scores. The possible reasons of inefficiency are investigated, and the target
volume of irrigation water and irrigated area ensuring the same agricultural
production were determined. It is concluded that in inefficient IAs the same
agricultural production revenue can be achieved with approximately 60% less
water and irrigated area.
 EU, “Water scarcity and drought in the European Union”, EU Publications Office, (2010). http://ec.europa.eu/environment/water/quantity/pdf/brochure.pdf
 UN, “United Nations World Water Development Report, Water and Jobs”, United Nations Educational, Scientific and Cultural Organization, Paris, (2016). http://www.unesco.org/new/en/natural-sciences/environment/water/wwap/wwdr/2016-water-and-jobs/
 DSI, “Devlet Su İşleri Genel Müdürlüğü 2015 Yılı Faaliyet Raporu”, General Directorate of State Hydraulic Works (DSI), Ankara, (2015).
 TOBB, “Türkiye Tarım Sektörü Raporu”, The Union of Chambers and Commodity Exchanges of Turkey (TOBB), 2014/230, Ankara, (2014).
 Kočišová K., “Application of the DEA on the measurement of efficiency in the EU countries”, Agricultural Economics - Czech, 61: 51-62, (2015).
 Nowak A., Kijek T., Domańska K., “Technical efficiency and its determinants in the European Union agriculture”, Agricultural Economics - Czech, 61: 275-283, (2015).
 Belton V., Vickers S.P., “Demystifying DEA-A visual interactive approach based on multiple criteria analysis”, Journal of Operational Research Society, 44 (9): 883-896, (1993).
 Li X.B., Reeves G.R., “A multiple criteria approach to data envelopment analysis”, European Journal of Operational Research, 115: 507-517, (1999).
 Sarkis J., “A comparative analysis of DEA as a discrete alternative multiple criteria decision tool”, European Journal of Operational Research, 123: 543-557, (2000).
 Allen R., Athanassopoulos A., Dyson R.G., Thanassoulis E., “Weight restrictions and value judgements in data envelopment analysis: Evolution, development and future directions”, Annals of Operations Research, 73: 13-34, (1997).
 Lins M.P.E., Moreira da Silva A.C., Lowell C.A.K., “Avoiding infeasibility in DEA models with weight restrictions”, European Journal of Operational Research, 181: 956-966, (2007).
 Wong Y.H.B., Beasley J.E., “Restricting weight flexibility in data envelopment analysis”, Journal of Operational Research Society, 41(9): 829-835, (1990).
 Silay A., Gündüz O., “Demirköprü baraj gölü su bütçesi ve sulama performans değerlendirmesi”, V. Ulusal Hidroloji Kongresi, 103-112, Ankara, (2007).
 Akkuzu E., Mengü G.P., “Aşağı Gediz Havzası sulama birliklerinde karşılaştırmalı performans göstergeleri ile sulama sistem performansının değerlendirilmesi”, Ege Üniversitesi Ziraat Fakültesi Dergisi, 49 (2): 149-158, (2012).
 Çetinkaya C.P., Barbaros F., “Su yönetimi senaryoları ile Gediz nehri yıllık su bütçesi performansının değerlendirilmesi”, TMMOB 2. Su Politikaları Kongresi, 323-334, Ankara, (2008).
 Yilmaz B., Yurdusev M.A., Harmancioglu N.B., “The assessment of irrigation efficiency in Buyuk Menderes Basin”, Water Resources Management, 23: 1081-1095, (2009).
 Charnes A., Cooper W.W., Rhodes E., “Measuring the efficiency of decision-making units”, European Journal of Operational Research, 2: 429-444, (1978).
 Thanassoulis E., Allen R., “Simulating weight restrictions in data envelopment analysis by means of unobserved DMUs”, Management Science, 44 (4): 586-594, (1998).
 Thompson R.G., Langemeier L.N., Lee C.T., Thrall R.M., “The role of multiplier bounds in efficiency analysis with application to Kansas farming”, Journal of Econometrics, 46: 93-108, (1990).
 Scheel H., “EMS: Efficiency Measurement System User’s Manual”, Universität Dortmund, Dortmund, Germany, (2000).
 Dyson R.G., Allen R., Camanho A.S., Podinovski V.V., Sarrico C.S., Shale E.A., “Pitfalls and Protocols in DEA”, European Journal of Operational Research, 132: 245-259, (2001).