1. Sammamish River Diel Dissolved Oxygen and pH Study September 21, 2005

2. STUDY AREA

6. Sammamish River Basins Big Bear Creek Little Bear Creek Swamp Creek North Creek

8. Study Goals Diel variation of DO and pH during summer low-flow period Focus on upper reach between Lake Sammamish and Woodinville Provide information for development of dynamic water quality model

9. CE-QUAL-W2 Model Vertically 2-D model Laterally averaged Hydrodynamics, temperature, algae/eutrophicaton kinetics Epiphyton and riparian shade model added recently

10. Sammamish River Model

11. Historical Data

13. Sammamish River routine grab ambient monitoring data DISSOLVED OXYGEN 2003 - 2004

14. Sammamish River routine grab ambient monitoring data DISSOLVED OXYGEN 2003 - 2004

15. Monitoring Locations

17. Reconnaissance Data

18. Sammamish River diel DO and pH data collected in 2000

19. Sammamish River diel DO and pH data collected in 2002

20. 2003 Study Results

22. Photo Tour of Sampling Sites

23. Redmond Rowing Club

24. Between Bear Creek and Redmond Railroad Bridge

25. Redmond Railroad Bridge

27. Upstream of NE 116 th St Bridge

28. Upstream of NE 145 th St Bridge

29. Woodinville Railroad Bridge

30. I-405 Bridges

31. Upstream of Blyth Park (old Railroad Bridge)

32. Summer 2003 Flow and Precipitation Conditions

33. Daily maximum discharge and total daily precipitation recorded by local King County gauges in the Little Bear and Big Bear Creek basins during the 2003 study

34. Time Series Data

35. Sammamish River YSI EDS data, 2003

36. Sammamish River YSI data from the third deployment 7/22/03 through 7/30/03

37. Sammamish River YSI data from the fourth deployment 8/22/03 through 9/2/03

38. Longitudinal Summary Plots

39. Longitudinal profiles of Sammamish River maximum temperature, temperature range, minimum DO, and DO range for selected days in 2003

40. Longitudinal profiles of Sammamish River maximum pH, pH range, minimum DO percent saturation, and DO percent saturation range for selected days in 2003

41. Comparison to Water Quality Standards

42. Comparison of 2003 Sammamish River YSI continuous temperature, DO and pH data to water quality standards

43. Critical Period for DO?

44. Sammamish River routine grab ambient monitoring data DISSOLVED OXYGEN 2003 - 2004

45. Sammamish River routine grab ambient monitoring data DO SATURATION 2003 - 2004

46. Unintended Results Storm Event

47. Daily maximum discharge and total daily precipitation recorded by local King County gauges in the Little Bear and Big Bear Creek basins during the 2003 study

48. Temperature, specific conductance, DO and pH data recorded by the YSI EDS sonde 9/1/2003 through 9/14/2003

49. Unintended Results Conductance/Groundwater Linkages

50. Longitudinal trend in specific conductance, 8/22/2003 through 9/2/2003

51. Sammamish River YSI unqualified specific conductance data, 2003

52. Sammamish River YSI data from the third deployment 7/22/03 through 7/30/03

53. Modeling to Identify Cause of pH/DO Fluctuations QUAL2Kw

59. Model Segment below Bear Creek

60. Periphyton Photosynthesis Model Segment below Bear Creek

61. Reaeration Model Segment below Bear Creek

62. Periphyton respiration Model Segment below Bear Creek

63. Conclusions Continuous monitoring of DO and pH is feasible provided proper and well maintained equipment are available. Significant diel variation in DO and pH occurs in the Sammamish River particularly between Big Bear and Little Bear creeks Unintentionally, other phenomena were also observed

64. Recommendations Synoptic temperature/conductance study to identify significant surface and groundwater inputs to the river Quantify the distribution and biomass of aquatic plants and attached algae in the Sammamish River Conduct a time-of-travel study in the Sammamish River to support model development Confirm/investigate fluctuation of conductance in Big Bear Creek

66. THE END

67. Sammamish River YSI EDS raw data, 2003

69. Sammamish River YSI unqualified data from the first deployment 5/29/03 through 6/6/03

70. Sammamish River YSI unqualified data from the second deployment 6/24/03 through 7/2/03

71. Sammamish River YSI unqualified data from the fifth deployment 9/25/03 through 10/3/03

85. Model Setup