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Pyramid Lake

WQ Modeling & Monitoring, Periphyton, Fish and Invertebrate Monitoring: DRI’s Multifaceted Ecological Assessment Programs Chris H. Fritsen, Desert Research Institute. California. Nevada. Marble Bluff Dam. Pyramid Lake. Derby Dam. Nixon, NV. Wadsworth, NV. Truckee Canal.

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Pyramid Lake

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  1. WQ Modeling & Monitoring, Periphyton, Fish and Invertebrate Monitoring:DRI’s Multifaceted Ecological Assessment ProgramsChris H. Fritsen, Desert Research Institute

  2. California Nevada Marble Bluff Dam Pyramid Lake Derby Dam Nixon, NV Wadsworth, NV Truckee Canal Tahoe City, CA Reno/Sparks, NV Lake Tahoe Truckee River Basin

  3. Leave Dead Ox Leave Dodge Flat Enter Pyramid Lake S-S Enter Dead Ox Meadows Long Valley Creek Enter Dodge Flat Derby Dam

  4. Groundwater Contours, Lower Truckee River

  5. A Long-Term Dynamic Modeling Approach to Quantifying Impacts of Subsurface Agricultural NPS Pollutionin the Lower Truckee River, Nevada Thesis by: Suzanne Kish Department of Environmental Engineering Sciences Advisor: Dr. John J. Warwick

  6. Full Simulation – Upstream Results NH4 at Segment 15, Painted Rock NO3 at Segment 15, Painted Rock

  7. Full Simulation – Upstream Results DO at Segment 15, Painted Rock OPO4 at Segment 15, Painted Rock

  8. Biomass Monitoring

  9. 200 Chla (mg cm-2) 100 Jul 01 Jun 01 May 01 PATA Apr 01 EMCC Mar 01 LOCK Feb 01 Jan 01 PATR Dec 00 TRAC Nov 00 PAIN Oct 00 JOHN Sept 00 DEAD Aug 00 LNIX Biomass Results Figure 2. Dynamics of chlorophyll a standing stocks on cobble habitats in the lower Truckee River from August 2000 until July 2001.

  10. Associated activities • Nutrient Limitation Study • Azolla Study • Isotopes (L. Saito-UNR)

  11. Periphyton P to N limitation? Trend is evident (above): But annual events can change the balance (e.g. drought, fire and releases)

  12. Red Strip Observations and Dynamics

  13. Truckee River Sediment TMDL DevelopmentGoals • Estimate sediment load for TMDL source assessment • Characterize sediment variability • Develop surrogate for sediment using turbidity Sampling sites along Truckee River Principal Investigator: G. Dana, Desert Research Institute Funding Agency: Lahontan Regional Water Quality Control Board

  14. Sediment Sampler Turbidity Sensor Truckee River Sediment TMDL Development Results will be used in conjunction with previous biological studies to determine level of sediment impairment in the Truckee River.

  15. Source Analysis by Compilation of Data • Developed relationship between Sediment Load and Flow • Lub=10B0LogQ(t)B1e2.651s2

  16. Sediment Load Prediction, Normalized by Area

  17. Fish and Bugs • Macroinvertebrate Bioassessments (Sada+NDEP) • Stream Fish Abundance & Community Structure (Sada/TNC) McCarran Ranch Restoration • Tahoe Basin Stream Fish/Habitat Relationships (Sada/NDOW )

  18. Past and Present DRI Eco-assessment programs • Interdisciplinary • Help Construct Framework for Future Bio-assessment Programs. • e.g. Developing Ecological Condition Gradients • e.g. Development of IBI’s

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