The reservoir of Kowsar dam supply water for
different usages such as aquaculture farms , drinking, agricultural and
industrial usages for some provinces in south of Iran. The Kowsar
dam is located next to the city of Dehdashat in Kohgiluye and
Boyerahmad province in southern Iran. There are some towns and
villages on the Kowsar dam watersheds, which Dehdasht and Choram
are the most important and populated twons in this area, which can to
be sources of pollution for water reservoir of the Kowsar dam . This
study was done to determine of water pollution of the Kowsar dam
reservoir which is one of the most important water resources of
Kohkiloye and Boyerahmad and Bushehr provinces in south-west
Iran. In this study , water samples during 12 months were collected to
examine Biochemical Oxygen Demand (BOD) and Dissolved
Oxygen(DO) as a criterion for evaluation of water pollution of the
reservoir. In summary ,the study has shown Maximum, average and
minimum levels of BOD have observed 25.9 ,9.15 and 2.3 mg/L
respectively and statistical parameters of data such as standard
deviation , variance and skewness have calculated 7.88, 62 and 1.54
respectively. Finally the results were compared with Iranian national
standards. Among the analyzed samples, as the maximum value of
BOD (25.9 mg/L) was observed at the May 2010 , was within the
maximum admissible limits by the Iranian standards.
 Norman E. Peters, and Michel Meybeck, Water Quality Degradation
Effects on Freshwater Availability: Impacts of Human Activities
,International Water Resources Association Water International,
Volume 25, Number 2, Pages 185-193, 2000
 Falkenmark, M. L. Andersson, R. Castensson, and K. Sundblad, eds.
Water, A Reflection of Land Use - Options for Counteracting Land and
Water Mismanagement. NFR, Swedish Natural Science Research
Council, Stockholm, Sweden: 128 pages .1999
 Food and Agriculture Organization of the United Nations (FAO).
Aquaculture -- new opportunities and a cause for hope.
http://www.fao.org/focus/e/fisheries/aqua.htm viewed on November 10,
 Grant, A., & A.D. Briggs. 1998. Use of Ivermectin in marine fish farms:
Some concerns. Marine Pollution Bulletin. 36(8): 566-568.
 Costelloe, M., Costelloe, J., O'Connor, B. and P. Smith. 1998. Densities
of polychaetes in sediments under a salmon farm using Ivermectin.
Bulletin of the European Association of Fish Pathology. 18(1): 22-25.
 Hem, J.D. 1985. "Study and Interpretation of the Chemical
Characteristics of Natural Water." U.S. Geological Survey Water-
Supply Paper 2254: 263 pages,1985.
 Meybeck, M. 1996. "River Water Quality: Global Ranges, Time and
Space Variabilities, Proposal for Some edefinitions."Internationale
Vereinigung f├╝r Theoretische und Angewandte Limnologie,
Verhandlungen 26: 81-96.
 Standard Methods for Examination of Water and Waste Water. APHA
Inc., New York, 20th Edition, 2-9, 2-48, 4-87, 4-134, 5-3, 9-47.
 IS:2488, (1966), Indian standard code on methods of sampling and tests
for industrial effluents, IS:2488,(1966) - Part 1, Bureau of Indian
Standards, New Delhi.