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Mallard Island and the Largest Flood Event Since 1997
Nicole DavidLester McKeeSan Francisco Estuary Institute
Sacramento RiverFlood Control System
Shasta Dam
Hillcrest
Freeport
Yolo Bypass Schematic
Sampling Events
• December 25-28, 2005
First “Flush” sampled at Mallard Island, 9 samples + 1 duplicate
• January 2-18, 2006
Contingency Budget used for 14 samples + 1 duplicate for flood event
Data from 12/30/2005 through 01/18/2006 · Duration: 19 days
Sacramento River at Freeport
88,000 cfs
Data from 12/30/2005 through 01/18/2006 · Duration: 19 days
Yolo Bypass near Woodland
260,000cfs
Yolo Bypass
Cache Creek
Sacramento River
Delta Outflow from 12/25/05 to 01/25/06
370,000 cfs
Cross Section SurveyTuesday, January 10, 2006
Morning
Afternoon
USGS performed 8 cross-sectional surveys of velocity and turbidity
Results similar to previous surveys, establishing MI gauge house as representative sampling site
Cross Section Surveys
Return Frequency
Storm Event Comparison
Precipitation over 24 hour period
Hillcrest Shasta Dam Yolo Bypass Peak
inches inches cfs December 29,2005 1.76 0.96 December 30, 2005 0.56 1.00 December 31, 2005 5.16 2.76 January 1, 2006 0.84 0.68 January 2, 2006 2.16 2.56 January 3, 2006 0.28 0.16 Total 10.76 8.12 260,000 March 3, 2006 0.12 0.40 March 4, 2006 0.56 0.32 March 5, 2006 0.20 0.20 March 6, 2006 3.08 4.44 March 7, 2006 1.84 0.96 March 8, 2006 0.64 0.08 Total 6.44 6.40 70,000
Yolo Bypass March 1-12, 2006
Relationship between total Hg and SSC influenced by salinity
y = 0.12x + 2.54
R2 = 0.8
y = 0.29x - 2.13
R2 = 0.8
0
2
4
6
8
10
12
14
16
0 20 40 60 80 100 120
SSC (mg/L)
Me
rcu
ry (
ng
/L)
EC < 2 mS/cm
EC > 2 mS/cm
Salinity Measurements in Dec 05 and Jan 06
Sample ID Date Value in ppt EC in mS/cmMI 300 25-Dec-05 0.3 0.7MI 300 Dup 25-Dec-05 0.3 0.7MI 301 26-Dec-05 0.8 1.9MI 302 26-Dec-05 0.3 0.7MI 303 26-Dec-05 0.3 0.7MI 304 27-Dec-05 0.2 0.5MI 305 27-Dec-05 0.2 0.5MI 306 27-Dec-05 0.3 0.9MI 307 28-Dec-05 0.2 0.5MI 308 28-Dec-05 0.3 0.6MI 309 2-Jan-06 0.1 0.2MI 310 4-Jan-06 0.1 0.2MI 311 5-Jan-06 0.1 0.2MI 311 Dup 5-Jan-06 0.1 0.2MI 312 5-Jan-06 0.1 0.2MI 313 6-Jan-06 0.1 0.2MI 314 6-Jan-06 0.1 0.2MI 315 7-Jan-06 0.1 0.2MI 316 8-Jan-06 0.1 0.2MI 317 10-Jan-06 0.1 0.2MI 318 10-Jan-06 0.1 0.2MI 319 12-Jan-06 0.1 0.2MI 320 14-Jan-06 0.1 0.2MI 321 16-Jan-06 0.1 0.2MI 322 18-Jan-06 0.1 0.2
Seth Shonkoff,SFEI
Max Delaney, SFEI
Jay Davis, SFEI
Richard Looker,Regional Board
Jennifer Hunt,SFEI
Thank You!