Need for Advanced Stormwater Treatment at Lake Tahoe - PowerPoint PPT Presentation

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Need for Advanced Stormwater Treatment at Lake Tahoe

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Need for Advanced Stormwater Treatment at Lake Tahoe John E. Reuter & Dave Roberts ... Progressive accumulation leads to long-term decline Management strategy ... – PowerPoint PPT presentation

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Title: Need for Advanced Stormwater Treatment at Lake Tahoe


1
Need for Advanced Stormwater Treatment at Lake
Tahoe
John E. Reuter Dave Roberts Tahoe TMDL Research
Program
2
Lake Tahoe A Changing Ecosystem
  • Significant portions are urbanized
  • Increased resident population
  • Millions of tourists
  • Peak VMT gt1,000,000 miles/day
  • Loss of wetland and runoff infiltration
  • Extensive road network
  • Land disturbance - soil erosion
  • Air pollution

3
Unraveling Cause(s) for Declining Water Clarity
  • Nutrients stimulate algae
  • Fine-sediments directly reduces clarity (1-20 µm)
  • Progressive accumulation leads to long-term
    decline
  • Management strategy - P, N, sediment control
  • TMDL, EIP other plans are addressing load
    reduction

4
TMDL Development Phases
Phase I - Determines Current Loading -
Determines Basin-wide Load Reduction Needs Phase
II - Identify Load Reduction Possibilities -
Allocates Pollutant Load Reductions -
Implementation Plan Phase III - Implementation
and Monitoring - Adaptive Management
framework - Predetermined Review Periods
5
Tahoe TMDL Phase 2
  • Preliminary finding suggest that in many urban
    areas at Tahoe, traditional BMPs may not be
    capable of meeting the needed levels of pollutant
    reduction.
  • New approaches/technologies may be required.
  • Implementers must be given a full range of load
    reduction options.
  • In 2004 Tahoe Basin one of 14 projects selected
    nation-wide to receive A USEPA Targeted Watershed
    grant.

6
Tahoe TMDL Phase 2
  • New approaches under consideration at Tahoe
  • Mitigation of air-borne pollutants
  • Hydrologic controls to reduce runoff
  • Stream channel erosion
  • BMP maintenance
  • Advanced localized or centralized stormwater
    treatment
  • Collaborative research by Phil Bachand Assoc.,
    UC Davis, Caltrans and CSUS-OWP has been
    examining use of flocculants and coagulants as a
    possible means of enhancing treatment either in
    separate treatment systems or associated with an
    existing BMP.
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