Lower Yuba River Accord Accord Flow and Temperature Performance Yuba Accord River Management Team 5 th Annual Symposium June 12, 2013
Accord Flow and Temperature Overview Flows Temperatures Implementation of Yuba Accord Operations Lower Yuba River Accord 2 RMT Symposium, June 2013
Flow Schedules Two Compliance Points: Smartsville at 0.5 mi, Marysville at 19 mi Marysville usually controls 19 mi 0.5 mi Six flow schedules, plus a conference year OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP Annual 1-30 Vol. (TAF) 1-15 16-31 1-30 1-31 1-31 1-29 1-31 1-15 16-30 1-15 16-31 1-15 16-30 1-31 1-31 1 500 500 500 500 500 500 700 1000 1000 2000 2000 1500 1500 700 600 500 574 2 500 500 500 500 500 500 700 700 800 1000 1000 800 500 500 500 500 429 3 500 500 500 500 500 500 500 700 700 900 900 500 500 500 500 500 399 4 400 400 500 500 500 500 500 600 900 900 600 400 400 400 400 400 362 5 Lower Yuba River Accord 3 RMT Symposium, June 2013 400 400 500 500 500 500 500 500 600 600 400 400 400 400 400 400 335 6 350 350 350 350 350 350 350 350 500 500 400 300 150 150 150 350 232
Flow Schedule Dispatch: North Yuba Index Indexing flow schedules to available water Includes storage Includes current best predictions or actual inflow The North Yuba Index leverages storage to Schedule 1 increase the occurrence of higher flows 1400 The North Yuba Index: Schedule 2 1040 Schedule 3 Available Water = Storage in NBB (9/30) 920 Schedule 4 820 Schedule 5 + Inflow to NBB 693 Schedule 6 500 Conference Lower Yuba River Accord 4 RMT Symposium, June 2013
Yuba Accord Flow Schedule Occurrence Development of Accord Flows: Optimum flow schedules, plus Accurate index for flow schedule dispatch, plus High occurrence of schedules 1 & 2 Percent Occurrence Schedule North Yuba Index Cumulative 1 >1,400 56% 56% 2 1,400 to 1,040 22% 78% 3 1,040 to 920 7% 85% 4 920 to 820 5% 90% 5 820 to 693 5% 95% 6 693 to 500 4% 99% Conference < 500 1% 100% Lower Yuba River Accord 5 RMT Symposium, June 2013
Expected Occurrence Frequency of Accord Flow Schedules Lower Yuba River Accord 6 RMT Symposium, June 2013
Ranked North Yuba Index (Accord EIR model) In the Drier Years (low inflow) Storage plays an increasing Start of Water Year role in determining NBB Active Storage flow schedule In the Driest 15% of Annual NBB Inflow years the Accord Flow Volume is about equal to the total NBB Inflow (modeled) Lower Yuba River Accord 7 RMT Symposium, June 2013
Comparison of Year Types and Flow Schedule North Yuba Index Yuba River Index Sacramento Valley (Yuba Accord) (D1644) Index 2006 NA (1) Wet Wet 2007 2 Dry Dry 2008 3 Critical Critical 2009 2 Below Normal Dry 2010 2 Below Normal Below Normal 2011 1 Wet Wet 2012 2 Below Normal Below Normal Lower Yuba River Accord 8 RMT Symposium, June 2013
Accord Water Temperature Performance Accord flows designed to achieve various temperature objectives No assigned temperature criteria Extensive modeling in 2005-2007 predicted good results Empirical water temperature data 2007 – 2012 Actual Mean Daily temperatures have generally been in the ranges expected Summertime temperatures at Marysville have been at or below the expected ranges Lower Yuba River Accord 9 RMT Symposium, June 2013
Actual Temps in River Colder than Predicted by Modeling – 2007 (Dry) Lower Yuba River Accord 10 RMT Symposium, June 2013
Actual Temps in River Colder than Predicted by Modeling – 2008 (Critical) Lower Yuba River Accord 11 RMT Symposium, June 2013
Actual Temps in River Colder than Predicted by Modeling – 2009 (Dry) Lower Yuba River Accord 12 RMT Symposium, June 2013
2007 – Schedule 2 (Dry Year) Lower Yuba River Accord 13 RMT Symposium, June 2013
2008 – Schedule 3 (Critical Year) Lower Yuba River Accord 14 RMT Symposium, June 2013
2009 Schedule 2 (Below Normal Year) Lower Yuba River Accord 15 RMT Symposium, June 2013
2010 Schedule 2 (Below Normal Year) Lower Yuba River Accord 16 RMT Symposium, June 2013
2011 Schedule 1 (Wet Year) Lower Yuba River Accord 17 RMT Symposium, June 2013
2012 Schedule 2 (Below Normal Year) Lower Yuba River Accord 18 RMT Symposium, June 2013
Summary Flows Perform as intended With the North Yuba Index, less impact (more water) in drier year types Temperatures Performance generally better than modeled (colder temps) during warm summer months Implementation of Yuba Accord Operations Successful implementation - no violations of Fisheries Agreement No trigger of penalties or dispute provisions Lower Yuba River Accord 19 RMT Symposium, June 2013
Lower Yuba River Accord Accord Flow and Temperature Performance Yuba Accord River Management Team 5 th Annual Symposium June 12, 2013
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