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Introduction to the Central Valley
WEAP Model
Water Evaluation and Planning (WEAP) System
Generic, object-oriented,
programmable, integrated
water resources management
modeling platform
WEAP is a ‘water-centric’ planning
model
WEAP is an allocation model that balances water
supplies and demands under different scenarios
System schematic is set up using a standard set of
model objects
WEAP as an Integrated Water Basin Analysis Tool
Full accounting of water flows throughout watershed:
• Rainfall-runoff modeling
• Snow accumulation/melt
• Groundwater-surface water interaction
WEAP as an Integrated Water Basin Analysis Tool
Water infrastructure and demands are nested within
the underlying hydrological processes
• Programmable operating rules for infrastructure
• Represents water demands from all sectors
Central Valley Water Management Model
Pit R.
Cow Ck.
Battle Ck. Cottonwood Ck
Shasta
Trinity R.
Clear Ck
Oroville South Fk. Feather R.
Almanor
Big Chico Ck.
Butte Ck.
Elder/Thomes Ck
East Park/Stony Gorge/Black Butte
Cache Ck.
New Bullards Bar North Fk. Yuba R.
Bear R.
Folsom
Cross Canal North and Middle Fk. American R.
North and Middle Fk. Feather R.
Upper Pit R.
McCloud R.
1
Net Delta Outflow
Stanislaus R.
San Luis
San Joaquin R.
Camp Far West
Mokelumne R.
Calaveras R.
Tuolumne R.
Merced R.
Chowchilla/Fresno R.
Millerton
McClure
New Don Pedro
New Melones
New Hogan
Pardee
Putah Ck.
Yol
o B
ypa
ss
South Fk. American
Berryessa
Clear Lake
Stony Ck.
Sacr
am
ento
R.
Trinity Sacramento R.
Teh
am
a-C
olu
sa
Ca
na
l Middle and South Fk. Yuba R.
Sutt
er
Byp
ass
Gle
n-C
olu
sa
Ca
na
l
Whiskeytow
n
Camanche
Cosumnes R.
Tulloch
Eastman/Hensley
DELTA
San Luis
Frian
t-Kern
C
anal
Kings R. Pine Flats
Kern R. Isabella
Tule R. Success
Kaweah R. Kaweah
Tulare Lake
Sacramento River
Tulare Lake
San Joaquin River
Upper Trinity River
Delta
Rivers and Tributaries
Irrigated Agriculture
M&I/Environ. Demand
Inter-Basin Transfer
Reservoir
Canals and Diversions
Instream Flow Requirement
Interactive Groundwater
Rivers and Tributaries
Irrigated Agriculture
M&I/Environ. Demand
Inter-Basin Transfer
Reservoir
Canals and Diversions
Instream Flow Requirement
Interactive Groundwater
Irrigated Agriculture
M&I/Environ. Demand
Inter-Basin Transfer
Reservoir
Canals and Diversions
Instream Flow Requirement
Interactive Groundwater
Upper Watersheds
38 “Rim” watersheds
delineated by land use
and elevation
1 „catchment‟ object
per elevation band
Catchment area is divided
into different land uses
Climate inputs drive
snow pack/melt &
rainfall-runoff routines
29 Central Valley PA‟s
divided by water use:
• Irrigated Agriculture
• Urban Indoor
• Urban Outdoor
• Managed Wetlands
Also includes:
• 22 in-stream flow
requirements
• 21 groundwater basins
• Inter-Basin transfers to
San Francisco, Central
Coast, and South Coast
20 Crop types Soil moisture
thresholds
determine
irrigation
requirements Urban indoor demands
determined by number and
annual use rate per
household and employee
Managed wetlands are
divided based on timing
of seasonal flooding
Water demands
account for flooding
depth and flow
through requirements In-stream flow requirements
adjusted by water year type
Valley Floor
Groundwater
Carson City
Oakland
Sacramento
San Jose
San Francisco
C a l i f o r n i aC a l i f o r n i a
N e v a d aN e v a d a
0 70 14035 Miles
• Groundwater disaggregation
based on basins defined in
Bulletin-118
Hydrologic parameters
determine changes in
groundwater elevation
and stream interactions Pumping limits prevent
groundwater storage from
dropping below historic lows
Sacramento-San Joaquin Delta
• Water quality considerations:
Current salinity standards
Saltwater-fresh water interface standards
Currently using GMOD, ANN under development
• Delta exports
Constrained by VAMP
& 2008 FWS BO
Target San Luis filling
Minimum required
Delta outflows
Central Valley WEAP Model
What’s included:
• Climate-driven hydrology: supply and demand
• Water supply operations
• Ecosystems: in-stream flow, managed wetlands
• Groundwater
• Water quality: Delta Salinity
• Monthly Bypass Flows
What’s NOT included, but could be:
• Economics
• Hydropower
• Water quality: Temperature, BOD
Considering Uncertainty
• To date, used WEAP to evaluate:
– 12 future climate scenarios;
o Based on outputs from six general circulation models
(GCMs) were used to estimate future climate conditions
under two IPCC emission scenarios: A2 and B1
– 3 future demographic and land use scenarios:
o Current Trends, Strategic Growth, Expansive Growth • User-defined variable
controls switching between
climate scenarios
• Number references folder
containing climate data
Expression references
user-defined variable
Land use/Demographic scenarios
are contained within the model
How will water demand change in the future?
No changes
Business as
usual
How will water supply change in the future?
What will be the frequency and magnitude of droughts?
“Location” of droughts matters if
demands are also changing
Tulare Lake Hydrologic Region
9 rim Sierra watersheds plus 1 lumped inflows from west side
8 valley floor Planning Areas
Each has indoor urban, outdoor urban, and irrigated agricultural
demands
Irrigated agriculture in 2 PA‟s (703 & 706) split based on water
supply
2 major canals: California Aqueduct, and Friant-Kern Canal
2 links to out of Valley demands: Central Coast, Southern
California
San Joaquin River Hydrologic Region
8 rim Sierra watersheds plus 3 lumped inflows from west side
6 valley floor Planning Areas
Each has indoor urban, outdoor urban, and irrigated agricultural
demands
Irrigated agriculture in 3 PA‟s (602, 603 & 609) split based on
water supply
Managed wetlands in 2 PA‟s (606 & 609S)
3 major canals: California Aqueduct, Delta-Mendota Canal,
Madera Canal
2 links of out of Valley demands: Bay Area, Monterey County
Shared CVP and SWP storage in San Luis Reservoir
Yolo
Bypass
Sacramento San Joaquin
Delta
San Luis
Reservoir
PA609N
PA609S
PA608
PA607
PA606
PA603S
PA603N
PA602S
PA602N
Robust Decision Making
Outcome
Metrics
Uncertainties:
Climate and Land
Use/Demography
Response
Package
• Iterative, analytic process designed to identify strategies
that are robust to a wide range of planning uncertainties.
Contact Information
Brian Joyce
Stockholm Environment Institute
(530) 220-2111
http://www.weap21.org/
