continuous real-time water quality and water quantity data ... · water quality and water quantity...
TRANSCRIPT
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U.S. Department of the Interior
U.S. Geological Survey
Continuous Real-Time
Water Quality and
Water Quantity Data –
The Sentry Gage Program
Indiana Water Science Center
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Nutrient enrichment
and harmful algal
blooms
Erosion and
sediment transport
and accumulation
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Water Quality and Water Quantity
Water-quality and ecosystems health:
Suspended sediment
Nitrogen
Phosphorus
Concentrations from point sources and
nonpoint sources – permit limits or criteria
Streamflow – water quantity
Stream loads ( mass/time, lbs per day) and
watershed yields (lbs per day per sq mile)
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Traditional Approach to Water Quality
Water samples collected manually and
analyzed at the laboratory, data reported, and
distributed in paper and web-based formats
Time delay between sampling and data report
Difficult to represent entire range of potential
concentrations, especially high flow events
Night sampling and storm sampling risks
Travel distance for sampling crews
Resource limitations on number of samples
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The Sentry Gage Program:
continuous, real-time,
web-accessible data
24 / 7 / 365
Water quantity streamflow gage with continuous
water-quality sensors/analyzers and telemetry,
representative sampling, and surrogate modeling.
Suspended sediment, nitrogen, and phosphorus
concentrations and loads, plus water-quality
characteristics (dissolved oxygen, pH,
temperature, specific conductance, turbidity)
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Water-Quality Sensors
Stream-Stage Sensor
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Sentry gage equipment
Data logger with
telemetry and
solar power
multi-parameter
probes on water
quality sonde
Ultraviolet nitrate sensor automated
phosphate analyzer
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Data Transmission and Management
Field Station
with Data Collection
Platform (DCP)
Data Access and Processing
System (DAPS),
Wallops Island, VA
National Water
Information System
(NWIS)
GOES DOMSAT
LRGS
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Sentry Gage on Kankakee River at Davis, IN
Nitrate –
Discrete
Continuous
Data are
provisional
Rise in discharge = rise in nitrate
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Sentry Gage on Eagle Creek at Zionsville, IN
Nitrate –
Discrete
Continuous
Data are
provisional
12 samples over 3 months
Nitrate levels are
diluted by storm
events or snow
melt
Nitrate levels rise
with storm
events
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Routine maintenance,
calibration, data correction
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Representative sampling
Stream-width and depth-
integrated water samples for
laboratory analysis to verify
sentry gage sensor data and for
development of surrogate models
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eam
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w, cu
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per
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nd
Nit
rate
, m
g/L
Nitrate, SUNA
Streamflow, cfs
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feet
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nd
Nit
rate
, m
g/L
Nitrate, SUNA
Nitrate, discrete
Streamflow, cfs
Detection range 0.007 to 28 mg/L
Accuracy 0.028 mg/L
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Surrogate Model – a mathematical relation of
turbidity (sensor) and suspended sediment (lab)
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Su
sp
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trati
on
, m
g/L
Turbidity, continuous, formazin nephelometric units
03374100 White River at Hazleton, IN
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SSC=2.17*(Turbidity0.968)
R2=0.96
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Remote-controlled
autosampler
Monitoring well
with telemetry
precipitation gage
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USGS Methods for Continuous Water Quality
Pellerin, B.A. Bergamaschi, B.A., Downing, B.D., Saraceno,
J.F., Garrett, J.A., and Olsen, L.D., 2013, Optical techniques
for the determination of nitrate in environmental waters:
Guidelines for instrument selection, operation, deployment,
maintenance, quality assurance, and data reporting: U.S.
Geological Survey Techniques and Methods 1-D5, 37p.
Wagner, R.J., Boulger, R.W., Jr., Oblinger, C.J., and Smith,
B.A., 2006, Guidelines and standard procedures for
continuous water-quality monitors – Station operation,
record computation, and data reporting: U.S. Geological
Survey Techniques and Methods 1-D3, 51 p. + 8 attachments
http: pubs.water.usgs.gov
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http://waterwatch.
usgs.gov
USGS Real Time Nitrate
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Indiana Sentry
Gage Network:
7 active gages
5 proposed
gages
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Indiana and
Kentucky
sentry gages
in the Ohio
River basin
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Indiana sentry gages and stream
gages in the Illinois River basin
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Investigation of
Water Quality and
Water Quantity in
School Branch
Watershed,
Hendricks County