Truckee River Modeling System RiverWare User Group Meeting March 1, 2005
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Transcript of Truckee River Modeling System RiverWare User Group Meeting March 1, 2005
Truckee River Modeling System
RiverWare User Group Meeting
March 1, 2005
Tom Scott, Jeff Rieker and Shane Coors
Derby Dam
STAMPEDE
TRUCKEERIVER
CARSON RIVER
LAKE TAHOE
DONNER
Stillwater NWR
LAHONTANBOCAINDEPENDENCE
PROSSER
Reno/Sparks
NewlandsProject
CarsonCity
Fallon
PYRAMIDLAKE
Tahoe City
TRUCKEECANAL
Pyramid Lake Paiute Indian Reservation
NE
VA
DA
CA
LIF
OR
NIA
MARTIS
Many Conflicting Interests…
Pyramid Lake
Pre-Newlands Project Lake Level
80 Feet
Operations
• Current Operations – 1935 Truckee River Agreement– 1944 Orr Ditch Decree– 1959 Tahoe Prosser Exchange Agreement– 1994 Interim Storage Agreement– 1997 OCAP
• Future Operations – Truckee River Operating Agreement (TROA)
Model Objectives
• Efficient management of an increasingly valuable natural resource – the Truckee River
– Track the physical water daily– Track status of accounts in the system daily– Operate according to governing Policy – Forecast and plan for the coming year and years– Provide regular operational forecasts to stakeholders– Administer TROA
Truckee RiverWare Modeling System
Truckee Modeling System Concept
• Takes historic, current, and forecast hydrologic data and simulates system operation, while continuously tracking the status of accounts within the Truckee/Carson river system.
• Examine the analogous processes of managing a small company’s finances, and modeling the Truckee River Basin with RiverWare
Financial Management
• Accounts provide the structure for managing finances within a company
• All $ entering, passing through, and exiting the company are assigned to an account.
• Accounts represent possible categories of income and expenses (i.e. sales, payroll, taxes, etc.)
RiverWare
• In RW, accounts provide the framework to manage Truckee River water according to basin policy
• All water entering, flowing through, and leaving the basin is assigned to an account
• Accounts include water owners and designated usages (ie. TMWA, Floriston Rate, Endangered Species, etc.)
Accounts Structure“Management Framework”
Truckee Accounts Map
Accounting“Establish Current Status”
RiverWare
• Updates the status of all of the accounts on the system to the current time
• References gage flows, reservoir storage volumes, and water usages within the system
Financial Management
• Detailed, balanced accounting of all income and expenses from the beginning of the year to the current time
• Generate the current status of all accounts in the budget
Accounting ModelStep 1: “Establish Current Status”
Accounting Model Summary
• Input is all current streamgage and reservoir storage data in the basin from DIADvisor
• Computes accounts status after yesterday’s inflows, outflows, exchanges, and transfers
• Output is hydrologic and up-to-date accounting data
Forecasting“Project Inflows and Depletions”
Financial Management
• Income and expenses must be forecast from current time to the end of the year
• Forecast based on previous years’ incomes and expenses as well as current financial conditions
RiverWare
• Inflows to all reservoirs and all sidewater forecasted to the end of the year
• Demands and diversions forecasted to the end of the year
• Forecasts are based on analysis of historic values and current hydrologic conditions within the basin
Forecast ModelStep 2: “Project Inflows and Depletions”
Forecasting Model
NRCS ForecastedApril-July Volume
Truckee River at Farad
Volume:TOTAL sum1000’s Acre-feet
Flow:Daily RATEVolume per time
Forecast Model Summary
• Input is NRCS volume forecasts at Farad and Fort Churchill gages.
• Forecasts all inflows and depletions in the basin by a similar years analysis
• Output is forecasted basin hydrology for the remainder of the year.
Alternative Forecast InputMMS ESP Tool
Temperatures
-10.0
0.0
10.0
20.0
30.0
40.0
50.0
2/17/05 2/19/05 2/21/05 2/23/05 2/25/05 2/27/05 3/1/05 3/3/05
Deg
rees
F
30
40
50
70
90
110
NOW
Additional Forecast InputShort-term Realtime Forecast
Mineral2
Current Time
Current Time
0
200
400
600
800
1000
1200
6/17/97 6/19/97 6/21/97 6/23/97 6/25/97 6/27/97 6/29/97
Flo
w (
cfs)
outflow
MNSCAV
Current Time
Operations “Simulate Remainder of Year”
Financial Management
• Take current status of accounts, forecasted income, expenses and operational constraints and simulate flow of $ to end of year
• Generate periodic (daily/monthly) status of accounts – Profit and Loss Statement
RiverWare
• Given current status of accounts, forecasted inflows, and depletions, simulate operations of the system from current time to end of year.
• Generates the status of all accounts and physical quantities (flows, storages, etc.) each day throughout the simulation period
Operations ModelStep 3: “Simulate Remainder of Year”
• The heart of the Operations Model…..
The RulesetDefines basin policy and physical constraints in order to simulate operations to the end of the year
Operations Model“A flavor of Ops”
Operations Model“A flavor of Ops”
Example Rules:
Operations Model“A flavor of Ops”
Operational Criteria on Lake Tahoe• Water Surface elevation must not exceed 6229.1 ft• Operational Maximum release of 300 cfs• Absolute Maximum release of 2600 cfs• Minimum release of 50 cfs in the winter• Minimum release of 70 cfs in the summer• Outflow approaches zero when elevation nears rim according to a rating curve• Must release in conjunction with Boca Reservoir to satisfy the Floriston Rate
• During April – October if Tahoe elevation is above 6225.5, minimize Tahoe releases
• During April – October if Tahoe elevation is below 6225.5, maximize Tahoe releases
• During the Spring when reservoir is near capacity, releases must be made such that reservoir fills to 6229.1 ft but no higher.• If Tahoe is releasing minimum and the flows are not needed to maintain the floriston rate, then an equivalent amount of water is stored in Prosser Reservoir as “Tahoe-Prosser Exchange”
Lake Tahoe
0
10
20
30
40
50
60Ja
n-05
Feb
-05
Mar
-05
Apr
-05
May
-05
Jun-
05
Jul-0
5
Aug
-05
Sep
-05
Oct
-05
Nov
-05
Dec
-05
Month
Re
lea
se
(kA
F)
6,220.00
6,221.00
6,222.00
6,223.00
6,224.00
6,225.00
6,226.00
Re
se
rvo
ir E
lev
ati
on
(k
AF
)
50% Outflow30% Outflow70% Outflow50% Elevation30% Elevation70% Elevation
Combined Forecast
2/9/2005Lahontan Reservoir StorageBoca Reservoir StorageFarad Gauge Flow
Operations ModelSample Output
Data Flow
DIADvisor
DIADvisor host computer
Data Flow Between Models
Reno Carson City
Automation
• Data transferred to database at 2:30 PM each day
• Accounting model run at 3:30 each day
• Data retrieved from Reno in evening, forecast and ops model run when data arrives
• New forecast available first thing in the morning
Water Quality Modeling
• Utilize existing basin-specific water quality models
• Eventually provide real-time decisions
• Operate interactively with RiverWare– Data output from RW to external model– Model returns info to RW– Provides mechanism to link other models
(groundwater, sediment, etc.)
WQ Modeling
• Proliferation of accounts: 7 20
• Each Reservoir goes from single purpose to multi-purpose. Any kind of water in any reservoir
• Extensive exchanges and transfers throughout basin
• “Operation by Committee” – Model must facilitate interaction by stakeholders.
Other Credit WaterWater Quality Water/Fernley M&I Water
California M&I Water
Fish Credit Non-Firm M&I Credit
Fish Water
Firm M&I Credit
M&I Emergency Drought Supply
Acquireddiversion
rights
Single purposepower
component ofFloriston Rates
StorableLittle
TruckeeRiver
PrivateWater &
Former AgriculturalWater Rights
Exchangedfrom
Lake Tahoe
TROAWhat is Next?
The End
Pyramid Lake