1. Tami Thompson - MBK Engineers
Truckee River Flow Models Presented to Truckee River Nutrient WQS and TMDL Review Stakeholders December 14, 2011
Tami Thompson - MBK Engineers

2. OUTPUT POST-PROCESSORS
How Flow Models Work
Hydrology / Physical Data
Initial Conditions
Demands
Alternative Scenario Operations
FLOW MODEL SIMULATION
Modeled Results
Input data or other information
OUTPUT POST-PROCESSORS
Spatially and Temporally
Disaggregated and Adjusted Results
Data for Water
Quality Modeling and
Verification

3. TROM vs. Riverware Timestep 19 periods per year Daily
TROM / Instream
Riverware
Timestep
19 periods per year
Daily
Recognized and accepted accretions/depletions
Yes
Not yet
Aggregated accretions/depletions reaches matched to Water Quality models
No, but LimnoTech has process
No, further post-processing required
Implementation of Operational decisions
Yes for TRA and TROA
Mostly for current operations, not for TROA
Completed model
Simulation results consistent with TROA EIS and recent hearings

4. Description of Truckee River Operations Model (TROM)
Monthly mass-balance accounting and simulation model of the Truckee and Carson River watersheds
Implements prescribed water management practices such as:
Truckee River Agreement (TRA)
Truckee River Operating Agreement (TROA)
Uses fixed demands and water uses for the simulation period

5. Extents of Truckee River Operations Model

6. Alternative Scenarios Considered from the TROA EIS
Future No Action
Estimated “Buildout” Level of Development (2033)
Truckee River Agreement Operations (TRA)
TROA
Estimated Buildout Level of Development
Truckee River Operating Agreement Operations (TROA)

7. TROM Input Data Data common to all alternatives Hydrology
Physical Reservoir Data
Forecasting coefficients
Data that vary by alternative
220 operational “switches”
Initial reservoir and account conditions
Demands (consumptive and non-consumptive)
Accretions/depletions (dependent on land use)
Credit water operations
Instream flow and Pyramid Lake inflow targets

8. Post-Processing for River Flows
TROM Output
Monthly volume (acre-feet)
Aggregated diversion data
Limited river data locations
INSTREAM Post-processor
Translation of monthly volumes into flow for 19 periods annually
Estimates specific diversions
Estimates accretion/depletion by reach
Estimates river flows at additional locations

9. Flow Data Requirements for Water Quality Modeling
Water Quality Inputs
Truckee River reservoir releases
Diversions
Truckee Meadows Water Reclamation Facilities (TMWRF) Flows
For Verification of Water Quality Modeling
River flows
Return flows
Accretions and depletions (including creek inflows)

10. Questions?