A Watershed Year for RMP & CEP: Sources Pathways & Loadings 2002/03 Lester McKee & Jon Leatherbarrow...
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Transcript of A Watershed Year for RMP & CEP: Sources Pathways & Loadings 2002/03 Lester McKee & Jon Leatherbarrow...
A Watershed Year forRMP & CEP:
Sources Pathways & Loadings 2002/03
Lester McKee & Jon Leatherbarrow
May 2003
Achievements 2002/03
• Made New Estimates of Sediment & Hg Loads from Central Valley WY 1995-2001
• Completed Urban Runoff Literature Review
• Carried Out Winter High Flow Monitoring on the Sacramento River at Mallard Island
• Carried Out Winter High Flow Monitoring on the Guadalupe River at San Jose
Organization of Watershed Science at SFEI
Regional Monitoring ProgramSFEI Watershed Program
Geomorphology
Historical Ecology
WaterQuality
GISSources Pathways
& LoadingsWork Group
Status & Trends
Contaminant Fate
Exposure & Effects
The Team
Sources Pathways& Loadings
SFEI Technical Staff
-Don Yee-Sarah Pearce-Jennifer Hunt-Nicole David-Lester McKee-Chuck Striplen-Ben Greenfield-Jon Leatherbarrow
Laboratories
-UC Santa Cruz
-AXYS Analytical
-Moss Landing Marine Laboratories
Work Group
-RWQCB (R2, R5)-Private Consulting-Regulated Community-USGS-Environmental Organizations-Universities
PeerReview
Two Technical Themes
Loadings
ProcessesMass
Timing
Downstream Fate
ProcessesMass
Timing
1995 1996 1997 1998 1999 2000 2001
An
nu
al S
edim
ent
Lo
ad (
Mt)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Del
ta O
utf
low
(cf
s)
0
100000
200000
300000
400000
500000
600000Average Sediment LoadWY 95-01 = 1.4 ± 0.2 Mt
Central Valley Loads - Desktop StudySPL & USGS
Working Together
Central Valley Loads – Desktop Study
SPL & RWQCB R5 Working Together
y = 0.3149x - 2.5945
R2 = 0.9505
0
10
20
30
40
50
60
0 50 100 150 200
Suspended Sediment (mg/l)
Par
ticul
ate
Hg
(ng/
l)
Water Year
Hg load (kg)
1995 701154
1996 25355
1997 612134
1998 644141
1999 23852
2000 162 36
2001 68 15
Mean 383 84
Loadings – Central Valley
Loadings – Central Valley
0
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
100,000
11/30/02 12/10/02 12/20/02 12/30/02 1/9/03 1/19/03 1/29/03
Flo
w (
cfs
)
Sac at Freeport (FPT)
Yolo Bypass nr Woodland (YBY)
FPT + YBY
Sampling Events
Central Valley Sediment & Contaminant Loadings Fate
Freeport2.2 Mt/year
Mallard Is.1.4 ± 0.2 Mt/year
Carquinez?? Mt/year
Golden Gate?? Mt/year
Data from USGS Sacramento Field Office
??
Small Tributaries – Desktop & Special Studies
Written reports• Davis et al., 1999• Davis et al. 2000• Leatherbarrow et al., 2001• McKee et al., 2002
Main conclusions• Small Tribs are a Significant Load• Not Enough Data to Estimate Loads• Sediment is an Important Vector• Sediment Processes Differ Greatly
Between Watersheds
Sediment Sources• Hillslope• Bed & bank• Urban runoff
Sediment loadings• Small Tribs 0.04 - 2.8 Mt / y• Central Valley 0.6 - 4.0 Mt/ y
Small Tributaries – Desktop & Special Studies
1
10
100
1000
10000
1 10 100 1000 10000
Watershed Area (sq. km)
Se
dim
en
t Exp
ort
(t /
sq
. km
)
Central ValleySmall Tribs
Bay Sediment Budget
Sediment Export Variability
Loadings – Small Tributaries
Collaborators and Labs
Larry Freeman USGSRand Eads RSLAXYS and MLML
Loadings – Small Tributaries
12/10 12/14 12/18 12/22 12/26 12/30 01/03
Sta
ge (
ft)
4
6
8
10
12
14
16
Tur
bidi
ty (
NT
U)
0
200
400
600
800Stage HeightTurbiditySampling Event
Loadings – Small TributariesPreliminary Results
Concentrations Loads Estimates (kg)
Mercury 0.2 – 18 g / L 60 - 600
PCBs* 7.7 –27 ng / L 0.6 - 1.2
DDT* 0.6 – 3.1 ng / L 0.1 – 0.2
* Four samples only
Sediment / Contaminant Fate – Small Tributaries
Guadalupe R.at San Jose
Airport60-600 kg / year
Guadalupe R. atAlviso Slough
?? kg / year
Dumbarton Bridge?? kg / year
????
Future Directions in Sources Pathways & Loadings
Central Valley• Sample a “Yolo Bypass” storm• Conduct a study to determine the contaminant budget for Suisun Bay
Local Small Tributaries• Conduct a desktop study to test methods of extrapolation spatially
and temporally limited data• Conduct another year of sampling on Guadalupe River• Start a new study in another known contaminated tributary• Determine the local fate of Hg and PCB loading from Guadalupe