Presented to California Water and Environmental Modeling Forum · Background • Concerns with...
21
DSM2 Analysis of Water Level and Water Quality Violations in the South Delta DSM2 Analysis of Water Level DSM2 Analysis of Water Level and Water Quality Violations in and Water Quality Violations in the South Delta the South Delta Presented to California Water and Environmental Modeling Forum February 28, 2006
Transcript of Presented to California Water and Environmental Modeling Forum · Background • Concerns with...
DSM2 Analysis of Water Level and Water Quality Violations in
the South Delta
DSM2 Analysis of Water Level DSM2 Analysis of Water Level and Water Quality Violations in and Water Quality Violations in
the South Deltathe South Delta
Presented toCalifornia Water and Environmental
Modeling Forum February 28, 2006
Background
• Concerns with water levels and low flow conditions in the South Delta in current SDIP studies
• Could modified barrier operations alleviate low water level and stagnation events?
• Previously analyzed effects of export curtailment
DSM2 Application
• SDIP Plan C Barrier Operations / Standard Circulation Patterns
• Modifications to Barrier Operations to limit low water level and stagnation events
Map of South Delta and Barriers
SDIP Plan C Barrier Operations
Conditions that may trigger the agricultural barrier
operation Middle River Old River Grant Line
Canal
When HOR is operated during VAMP and OCT-NOV
(SJR < 10,000 cfs)Operated Operated Operated
SJR < 2500 Operated Operated Operated
2500 < SJR < 4000 Operated Operated
4000 < SJR < 8000 Operated
SJR > 8000
Monthly Flow (cfs)
SDIP Plan C Barrier Operations
Cumulative Frequency Distribution of Daily Average Flow in South Delta Channels(SANMAN Baseline with Priority 3 and Plan C Barrier Operations)
-1000
-500
0
500
1000
1500
2000
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Flow
(cfs
)Grant Line Canal (Channel 213)Grant Line Canal US BarrierMiddle River at MowryMiddle River US BarrierOld River near Tracy (US Barrier - Ch 79)Old River at Tracy Road Bridge (Ch 71)
SDIP Plan C Barrier Operations
Cumulative Frequency Distribution of Daily Average Flow in South Delta Channels(SANMAN Baseline with Priority 3 and Plan C Barrier Operations)
-300
-250
-200
-150
-100
-50
0
50
100
150
200
250
300
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0Flow
(cfs
)Middle River at MowryMiddle River US BarrierOld River near Tracy (US Barrier - Ch 79)Old River at Tracy Road Bridge (Ch 71)
Plan C vs Plan A Barrier Operations
Cumulative Frequency Distribution of Daily Average Flow in South Delta Channels(SANMAN Baseline with Priority 3 and Plan C Barrier Operations)
-300
-250
-200
-150
-100
-50
0
50
100
150
200
250
300
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Flow
(cfs
)Middle River at MowryOld River at Tracy Road Bridge (Ch 71)Middle River at Mowry (Plan A)Old River at Tracy Road Bridge (Plan A)
Plan C Barrier Configuration (SDIP DEIS/EIR)
• Grant Line Canal– 14 16’-wide bottom-hinged gates (in 2 channels)– boat lock
• Old River– 11 16’ wide bottom-hinged gates with a top
elevation of 5.5’– boat lock
• Middle River– 12 16’ wide by 10’ high bottom-hinged gates
with a top elevation of 5.5’
DSM2 Representation of Plan C Barrier Configuration
• Grant Line Canal– 120’ weir, invert at -11’ (US/DS Flow)– 51 1.5’ pipes, invert at -0.5’ (No US Flow)– When Installed, DS flow through pipes
• Old River– 75’ weir, invert at -10’ (US/DS Flow)– When Installed, no downstream flow
• Middle River– 60’ weir, invert at -10’ (US/DS Flow)– When Installed, no downstream flow
Definition of Violations
• Developed in cooperation with DWR• Water Level Violations
– Daily Minimum Water Level Below 0.0’NGVD (DSM2 Datum)
• Water Quality Violations– Three consecutive days with daily average
flow less than 50 cfs• April to November timeframe only
Compliance Locations
• Water Level Violations– Middle River at Mowry (East end, DSM2 Channel 126)– Old River at Tracy Road (East End, DSM2 Channel Ch 71)– Grant Line Canal East (DSM2 Channel 206)
• Water Quality Violations– Middle River at Mowry (East end, DSM2 Channel 126)– Middle River, Upstream of Barrier (West end, DSM2 Channel 133)– Old River at Tracy Road (East end, DSM2 Channel Ch 71)– Old River near Tracy, Upstream of Barrier (West end, DSM2
Channel 79)– Grant Line Canal East (DSM2 Channel 206)– Grant Line Canal West, Upstream of Barrier (DSM2 Channel 213)
Baseline Results (with Priority 3)
• Violations Summary
Days with Water Level Violations Low Flow Violations Total
GLC East US
Barrier (206)
Middle River
at Mowry
Old River
at Tracy Road
Old River
at Tracy Road
Middle River
at Mowry
Old River near Tracy
US Barrier
Middle River
US Barrier
SANMAN Baseline
with Priority 3
1 0 105 25 63 0 0 194
Changes to Plan C Operations
• Water Level Violations– Old River Barrier Operated on days with water level violation as leaky
barrier to avoid/limit stagnation– GLC pipe invert raised from -0.5 feet to 0.0 feet to protect water level
• Water Quality Violations – Flushing Flows in Middle River and Old River
– Middle River Barrier operated as a leaky barrier to allow net downstream flow
– Old River Barrier operated as a leaky barrier to allow net downstream flow– Grant Line Canal Barrier closed for one day (no downstream flow)
Map of South Delta and Barriers
Change in Flow – Grant Line Canal
Grant Line Canal (East)
-3,000
-2,000
-1,000
0
1,000
2,000
3,000
4,000
08/08/1978 00:00 08/09/1978 00:00 08/10/1978 00:00 08/11/1978 00:00 08/12/1978 00:00 08/13/1978 00:00
Flow
(cfs
)
Pr3 01b (final)Pr3 Baseline
Change in Flow – Old River at Tracy Road
Old River at Tracy Road
-600
-400
-200
0
200
400
600
800
1,000
1,200
08/08/1978 00:00 08/09/1978 00:00 08/10/1978 00:00 08/11/1978 00:00 08/12/1978 00:00 08/13/1978 00:00
Flow
(cfs
)
Pr3 01b (final)Pr3 Baseline
Change in Flow – Middle River at Mowry
Middle River at Mowry
-300
-200
-100
0
100
200
300
400
500
600
08/08/1978 00:00 08/09/1978 00:00 08/10/1978 00:00 08/11/1978 00:00 08/12/1978 00:00 08/13/1978 00:00
Flow
(cfs
)
Pr3 01b (final)Pr3 Baseline
Comparison of Daily Average Flows (cfs)
GLC MR Mowry
OR Tracy
GLC MR Mowry
OR Tracy
GLC MR Mowry
OR Tracy
Pr3 Pr3 Pr3 Pr3_01 Pr3_01 Pr3_01 P3_01b P3_01b P3_01b
8/4/78 1398 216 -127 1252 267 -95 1252 267 -94
8/5/78 1371 213 -108 1223 265 -68 1223 265 -68
8/6/78 1365 209 -96 1216 259 -49 1216 259 -49
8/7/78 1369 211 -88 1208 261 -35 1208 261 -35
8/8/78 1330 218 -77 1156 271 -20 -36 399 673
8/9/78 1291 214 -49 1119 267 5 -26 415 738
8/10/78 1299 214 -50 1118 265 9 1211 282 6
Final Results (with Priority 3)
• Violations Summary
Days with Water Level Violations Low Flow Violations Total
GLC East US
Barrier (206)
Middle River
at Mowry
Old River
at Tracy Road
Old River
at Tracy Road
Middle River
at Mowry
Old River near Tracy
US Barrier
Middle River
US Barrier
SANMAN Baseline
with Priority 3
0 0 1 0 0 0 0 1
Future Studies
• DSM2 QUAL simulations to look at salinity
• Head of Old River Fish Barrier Alternative Operations
• DICU sensitivity analysis (flow and quality)
