Evolution of a new surface water quality index for Karoon catchment in Iran.

Water quality standards are developed worldwide by national and international agencies for pollution control decision-making. Use-based water quality classification criteria and Water Quality Indices (WQIs) also play an important role in the assessment of the suitability of water resources for various applications. The present study proposes a better overall index for water quality in Iran and its application in Karoon River by exploring the behavior and limitations of conventional methods for quality evaluation. For this purpose, six variables were employed. Water quality determinants of the new index include Dissolved Oxygen, Total Dissolved Solids, Turbidity, Nitrate, Fecal coliform and pH. Besides, the mathematical equations applied to transform the actual concentration values into quality indices have been formulated. This study compares a new index called the Iranian Water Quality Index with other pre-existing indices such as NSFWQI, Oregon, CPCB WQI, MDOE WQI, Kaurish and Younos WQI, and Ahmed Said WQI. Results revealed that the overall quality of the surface water falls under the 'good' class. A case study of Karoon River is made to illustrate the application of this new index system.

[1]  Vijaya Deshpande,et al.  Development of an Overall Index of Pollution for Surface Water Based on a General Classification Scheme in Indian Context , 2003, Environmental monitoring and assessment.

[2]  Yilmaz Icaga,et al.  Fuzzy evaluation of water quality classification , 2007 .

[3]  David K. Stevens,et al.  An Innovative Index for Evaluating Water Quality in Streams , 2004, Environmental management.

[4]  Rolf A. Deininger,et al.  A Water Quality Index — Crashing the Psychological Barrier , 1972 .

[5]  D. Couillard,et al.  Analysis of water-quality indices , 1985 .

[6]  Jurate M. Landwehr,et al.  A statistical view of a class of water quality indices , 1979 .

[7]  W. Ott.  Environmental indices: Theory and practice , 1978 .

[8]  R. Pavanello,et al.  Assessment of surface water quality by a single index of pollution , 1971 .

[9]  R. Davies‐Colley,et al.  A water quality index for contact recreation in New Zealand. , 2001, Water science and technology : a journal of the International Association on Water Pollution Research.

[10]  C. Cude.  OREGON WATER QUALITY INDEX A TOOL FOR EVALUATING WATER QUALITY MANAGEMENT EFFECTIVENESS 1 , 2001 .

[11]  William Silvert,et al.  Fuzzy indices of environmental conditions , 2000 .

[12]  S A Abbasi,et al.  Qualidex – A New Software for Generating Water Quality Indice , 2006, Environmental monitoring and assessment.

[13]  Faisal Khan,et al.  Water Quality Evaluation and Trend Analysis in Selected Watersheds of the Atlantic Region of Canada , 2003, Environmental monitoring and assessment.