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Truckee River Modeling System RiverWare User Group Meeting March 1, 2005 Tom Scott, Jeff Rieker and Shane Coors.

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Presentation on theme: "Truckee River Modeling System RiverWare User Group Meeting March 1, 2005 Tom Scott, Jeff Rieker and Shane Coors."— Presentation transcript:

1 Truckee River Modeling System RiverWare User Group Meeting March 1, 2005 Tom Scott, Jeff Rieker and Shane Coors


3 Many Conflicting Interests… Pyramid Lake Pre-Newlands Project Lake Level 80 Feet

4 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)

5 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

6 Truckee RiverWare Modeling System

7 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

8 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”

9 Truckee Accounts Map

10 Accounting “Establish Current Status”

11 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 Model Step 1: “Establish Current Status”

12 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

13 Forecasting “Project Inflows and Depletions”

14 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 Model Step 2: “Project Inflows and Depletions”

15 Forecasting Model NRCS Forecasted April-July Volume Truckee River at Farad Volume: TOTAL sum 1000’s Acre-feet Flow: Daily RATE Volume per time

16 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.

17 Alternative Forecast Input MMS ESP Tool

18 Additional Forecast Input Short-term Realtime Forecast

19 Operations “Simulate Remainder of Year”

20 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 Model Step 3: “Simulate Remainder of Year”

21 The heart of the Operations Model….. The Ruleset Defines basin policy and physical constraints in order to simulate operations to the end of the year Operations Model “A flavor of Ops”

22 Example Rules:

23 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”

24 Lahontan Reservoir StorageBoca Reservoir StorageFarad Gauge Flow Operations Model Sample Output

25 Data Flow

26 DIADvisor DIADvisor host computer

27 Data Flow Between Models RenoCarson City

28 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

29 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.)

30 WQ Modeling

31 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 Water Water Quality Water/Fernley M&I Water California M&I Water Fish CreditNon-Firm M&I Credit Fish Water Firm M&I Credit M&I Emergency Drought Supply Acquired diversion rights Single purpose power component of Floriston Rates Storable Little Truckee River Private Water & Former Agricultural Water Rights Exchanged from Lake Tahoe TROA What is Next?

32 The End Pyramid Lake

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