Storm Water Surface water Monitoring

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Storm Water/ Surface water Monitoring

• By
• Vinnie Bryant
• Johnston, Inc.

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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

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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

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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

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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.

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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

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Enclosures and security
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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

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Site selection

• Must be flexible
• Dry ground today
• Underwater the next
• Usually poor access or in areas that are not easy
  to get to.

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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

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Measuring Flow

• Tough applications
• Low or no flow during dry periods
• Lack of primary devices can cause added problems

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TMDL and Agricultural Studies

• Sampler suction line placement
• Water Quality equipment connected to Sampler
• Multiple samples and multiple bottles required

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New Portable Refrigerated samplers with advanced
controller
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Location of equipment

• Limited to 26 ft of vertical lift
• Cant hang sampler from bridges under normal
  applications
• Limited to 100 ft of horizontal pull

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Intake for sampler
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Flow/ Stage applications
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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.

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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

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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.

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Questions?