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The Study on Water Quality of the Return Flow in Lower Tap Salao Irrigation Project

The Study on Water Quality of the Return Flow in Lower Tap Salao Irrigation Project. Hungspreug N. 1 Chooaksorn W. 2 and Sudcha P. 3 Department of Environmental Science, Faculty of Science and Technology, Thammasat University, Patumtanee, Thailand

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The Study on Water Quality of the Return Flow in Lower Tap Salao Irrigation Project

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  1. The Study on Water Quality of the Return Flow in Lower Tap Salao Irrigation Project Hungspreug N.1 Chooaksorn W.2 and Sudcha P.3 Department of Environmental Science, Faculty of Science and Technology, Thammasat University, Patumtanee, Thailand Email : 1 n_hungspreug@yahoo.com , 2chooaksorn@yahoo.com , 3psudcha@yahoo.com

  2. Purpose Determine and compare water quality of the irrigation canal and drainage canal in Sakaekrang river basin, Thailand Department of Environmental Science , Thammasat University

  3. Introduction • Water degradation was clearly caused by agriculture sources (non-point sources). Department of Environmental Science , Thammasat University

  4. Introduction(cont’) Water Quality ? Irrigated area Irrigation canals Drainage canals

  5. Introduction(cont’) • In 1993, in USA 65 % of rivers suffered the impacts from non-point source pollution. (US Department of Pollution Control, 2002). • In Thailand non-point sources pollution is the cause of severe water pollution.(Simachaya, 2000) Department of Environmental Science , Thammasat University

  6. Methodology Department of Environmental Science , Thammasat University

  7. Study Area • Southern Tap Salao in with part of Tab Salao irrigation project in the upper central part of Thailand. • covering 14,000 ha. • The water supply to this irrigation project came from the upstream Tab salao reservoir. Department of Environmental Science , Thammasat University

  8. Southern Tap Salao irrigation project

  9. Sampling Stations • 45 water quality sampling stations. • irrigation canal 22 stations • drainage canal 23 stations • collected samples during January 19th-22rd, 2007 Department of Environmental Science , Thammasat University

  10. Drainage canal stations Irrigation canal stations Water Quality Sampling Stations

  11. Irrigation canal stations

  12. Drainage canal stations

  13. Parameters. • pH • Conductivity (EC) • Temperature (Temp) • Turbidity (Tur) • DO • BOD • NO3–-N • NH3+-N • PO43--P • TS • TDS • SS Department of Environmental Science , Thammasat University

  14. Results Department of Environmental Science , Thammasat University

  15. Department of Environmental Science , Thammasat University

  16. Department of Environmental Science , Thammasat University

  17. Department of Environmental Science , Thammasat University

  18. pH

  19. Department of Environmental Science , Thammasat University

  20. Conductivity µm/cm

  21. Department of Environmental Science , Thammasat University

  22. Temperature °C

  23. Department of Environmental Science , Thammasat University

  24. Turbidity NTU

  25. Department of Environmental Science , Thammasat University

  26. Dissolved Oxygen (DO) mg/l

  27. Department of Environmental Science , Thammasat University

  28. Biochemical Oxygen Demand (BOD) mg/l

  29. Department of Environmental Science , Thammasat University

  30. NO3-N NH3-N mg/l

  31. Department of Environmental Science , Thammasat University

  32. Phosphate Phosphorus (PO34--P) mg/l

  33. Department of Environmental Science , Thammasat University

  34. Total Solid (TS)

  35. Department of Environmental Science , Thammasat University

  36. Total Dissolved Solid (TDS)

  37. Department of Environmental Science , Thammasat University

  38. Suspended Solid (SS)

  39. Conclusion

  40. Conclusion • The water quality in the irrigation canals was better than in drainage canals . Department of Environmental Science , Thammasat University

  41. Conclusion(cont’) • The water quality in the irrigation canal was classified as class 3 (medium clean) (1) consumption after treatment process. (2) agriculture Department of Environmental Science , Thammasat University

  42. Conclusion(cont’) • The water quality in the drainage canal was classified as class 4 (fairly clean) (1) consumption after special treatment process (2) industry Department of Environmental Science , Thammasat University

  43. Conclusion(cont’) • The water quality in the irrigation canal was not significant different from that in the drainage canal. Department of Environmental Science , Thammasat University

  44. Conclusion(cont’) • Water drained from Irrigated area which mostly claimed as non point sources pollutant somehow the irrigation area can acts as constructed wetland which can improve some water quality parameters. Department of Environmental Science , Thammasat University

  45. Recommendation

  46. Recommendation • Water qualities monitoring programme should be continued at certain sampling stations over a longer period. Department of Environmental Science , Thammasat University

  47. Acknowledgement • Staff of southern Tap Salao irrigation project, Royal Irrigation Department. Department of Environmental Science , Thammasat University

  48. Thank you for your attention.

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