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Storm Water Surface water Monitoring

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					Storm Water/ Surface water
       Monitoring
             By
        Vinnie Bryant
        Johnston, Inc.
EPA Clean Water Act
• 1972 NPDES was enacted as part of CWA
  – Created to eliminate pollutant discharges by 1985
  – Main causes of pollutant discharges were thought to
    be coming from Point Sources (industrial pipe
    discharges and municipal WWTP)
• 1987 NPDES program was expanded to include
 Non-Point Sources.
  – Created a new set of challenges to those that had to
    monitor and sample
Stormwater/ TMDL / Surface water Impact from
Agricultural, Industrial and Municipal run off
 • Many more non-point source monitoring applications taking place
   today
 • Stormwater monitoring
    – Industrial Run-off
    – Municipal Run-off
    – Construction Site Run-off
 • TMDL (Total Maximum Daily Loads)
    – Mandated by EPA
    – States required to evaluate water quality in major streams and
      rivers
 • Watershed assessments
    – Agricultural run-off
    – Surface water monitoring
What is different about non-point
monitoring than point source?
• More than just sampling is required
  – Sampler
  – Flow monitoring
  – Rain Fall Monitoring
  – Multi-parameter monitoring
     • pH
     • Turbidity
     • DO
     • Conductivity and others
Samplers




• New design that allows for two part program
    requirements
•   Added inputs to allow for rain gauge and multi-
    parameter sonde to be connected
•   New software to incorporate multiple triggers and
    expanded memory to record the data.
Sampler Challenges
 • Remote sites
      – Security
      – Many times open to
        public access
      – Off the beaten path
        hard to get to
 •   Power Issues
      – Must power more
        than the sampler
      – Long term waiting
        for storm event
Enclosures and security
Must Measure Rain fall
• Rain Gauge can be connected to sampler or be a
    stand alone logging device.
•   Install rain gauge so it is secure and not covered
    by trees
Site selection
• Must be flexible
   – Dry ground today
   – Underwater the
     next
• Usually poor access
  or in areas that are
  not easy to get to.
Power

• Large power demands
    – Usually no AC
      available at site
    – Sampler and other
      equipment in stand by
      until event happens
• Large deep cycle
    battery
•   Solar panel to charge
    battery
Measuring Flow
• Tough applications
  – Low or no flow during dry periods
  – Lack of primary devices can cause added
    problems
TMDL and Agricultural Studies
• Sampler suction line placement
• Water Quality equipment connected to
  Sampler
• Multiple samples and multiple bottles
  required
New Portable Refrigerated
samplers with advanced controller
 Location of equipment
• Limited to 26 ft of vertical lift
     – Can’t hang sampler from bridges under normal
       applications
•   Limited to 100 ft of horizontal pull
Intake for
sampler
Flow/ Stage applications
Triggers and event notification
• Optional Cell Phone allows
  – Monitoring of the system status
  – Data Retrieval
  – Programming Corrections or updates
  – Dial-out notification when a sample event is
    occurring, or when the equipment requires
    service.
• Sampler commands allow to activate
 program on rain amount over time and/or
 change in stage/rate of flow or other
 alarms.
Data Analysis
• Flow Link Software collects data from
 sampler memory.
  – Includes data from multi-parameter sonde, rain
    gauge and flow meter.
  – Imports data from other sources
  – Exports data collected from sampler to csv
    format.
  – Easy to use tool for creating graphs and tables
    right in Flow Link
                                                            I n f lo w & I n f iltr a tio n S tu d y
                                                                           D r y v s W e t W e a th e r

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 Coastal Studies Institute Scope
• Provide flow, turbidity, temp, and
  sampling capability at 9 storm water
  ocean outfalls along The Outer Banks.
• Provide level at 19 storm water vaults
  draining to the 9 outfalls.
• This will provide data to CSI that will
  allow them to predict contaminant
  plumes along the beach before they
  occur.
Questions?