MS Dam Safety Program Dusty Myers, P.E. Chief, Dam Safety Division.
Dam Safety Data Management
description
Transcript of Dam Safety Data Management
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Corps of EngineersBUILDING STRONG®
Dam Safety Data Management
William Empson, PE, PMP Senior Levee Safety Program Risk ManagerU.S. Army Corps of EngineersRisk Management Center [email protected]
Dam Safety WorkshopBrasília, Brazil20-24 May 2013
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Data Management
You have the data – what next?
Amanda Sutter, P.E.CEMVS
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Purpose
Perform timely evaluation of data to assure that unsafe performance of a
structure is detected as early as possible.
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Objectives
Learn various methods of data collection, processing, presentation, evaluation and reporting requirements
Identify various factors that influence dam
safety instrumentation data.
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Components of Data Management
Collection Reduction and processing Presentation Evaluation
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Data Collection Schedule
Factors affecting schedulePurpose of the instrumentProject conditionsAge of projectLoading eventObserved anomalyAvailability of personnelProject locationFundingCorporate policy
Flood
Funds NewLeak
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Data Collection
Data set should containProjectInstrument IDInstrument readingReadout unitReader’s nameDatePool and TailWeather conditionsUnusual conditionsInstrument damage
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Data Collection
ConsistencyPersonnelManner readings are takenEquipmentLabel instruments
Train data collection personnel Multiple readings Coordination of instrument readings
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Data Collection
Data Entry
Data booksField sheetLaptop computerHandheld or pocket computer
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Data Collection
Equipment used to monitor instruments should be calibrated and in good operating condition.
Good communication is critical between person(s) reading instruments and office personnel
Threshold values should be established and furnished to person(s) collecting and transmitting data.
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Reduction and Processing
Data Reduction Software
Corps Instrumentation Database Package, WinIDPSoftware developed in districtCommercial software
Microsoft Excel or AccessSINCOGeoKonGeomation
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WinIDP Development
–HQUSACE proponent–Based on survey of Districts (1990)
• Dam safety instrumentation needs• Compatibility with existing databases
–Converted to windows 1996–Web portal and GIS modules 2003–Continually updated; current version 5.5d
Latest version added Grapher 7 and modified scheduled tasks for data import and plotting.
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WinIDP: Features► User defined formats for input, plots, reports
Time dependent constants (repair riser => new elevation)
► Manual data entry with shared field conditions► Data import (can be automated / scheduled)► Compatible with Geomation and CSI dataloggers► Recalculate by data set or instrument► Data edit by data set or instrument
Mask data that is questionableBatch plottingNetwork or stand aloneMultiple users (concurrent use)
► Internet accessible, WebIDP.
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WebIDP Requires internet explorer and
internet access - No local installation.
Data entry Plots Reports
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WinIDP: Benefits
A Good Choice► Supported by COE dam safety people► Tailored for dam instrumentation► Upgrades and costs shared with others► Compatible with other engineering processes and
other information systems used in dam safety► Program is free. Pay as you go for support ► Don’t reinvent the wheel – improve the wheel if
needed.
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Data Presentation
Time History Plots
Positional Plots
Multiple Plots
Correlation Plots
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How does this data look?
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How about this data?
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What if I told you it’s the same data?
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Guidelines for Presentation
• Appropriate scale• Standardize format• Display relevant field conditions• Location and cross section on graphs• Note events and observations that may explain unusual data
• Avoid over crowded plots
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Time Series
Jan-1997 Ju l-1997 Jan-1998 Jul-1998 Jan-1999 Jul-1999 Jan-2000 Ju l-2000 Jan-2001 Ju l-2001 Jan-2002 Jul-2002390
400
410
420
430
440
ELE
VA
TIO
N (F
T-N
GV
D)
O pen System P iezom eters
PoolTa ilwaterOS PD -11-1OS PD -11-2OS PD -11-5OS PD -11-6
M ELVIN PR IC E LO C KS & D AM
INSTR. T IPN O . STA . O FFS ET ELEV.O SPD-11-1 24+83.5 U /S 11.2 354.0 O SPD-11-2 24+80.5 U /S 6 .2 354.0 O SPD-11-5 24+81.8 U /S 33.5 354.0 O SPD-11-6 24+82.8 U /S 80.8 344.0
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Positional (Fixed) & Multiple Graphs
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Positional (Variable)Clarence Cannon Dam Scour Survey at Station 15+25
510
520
530
540
550
560
0 100 200 300 400 500 600 700
OFFSET FROM LEFT BANK IN FEET (LOOKING DOWNSTREAM)
ELEV
ATIO
N (F
T-N
GVD
)
09/30/1997
09/18/1998
10/04/1999
09/26/2000
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Correlation
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Slide 25 of 82
Loading Path PresentationBest Fit
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Slide 26 of 82
Loading Path PresentationUpstream Limited
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Slide 27 of 82
Loading Path PresentationStorage
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Analysis and EvaluationTrends, Patterns and Thresholds
Performance PredictionRecent dataHistorical dataField conditions“Reasonable” limits
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Benefits to performance prediction
• Quick assessment of dam behavior• Indication that data was collected properly• Field conditions• Alert that readings are outside expected
values
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Warning for threshold use• Will not reveal plugged instrument• Only as good as data derived from• Should not substitute for thorough data
analysis
Thresholds may be applied during• Data collection• Data entry• Data evaluation
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Analysis and Evaluation
Compare Current Data to Recent dataHistorical data (established trend)InitialField conditionsDesign Prediction / ThresholdsOther instrument types
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Analysis and Evaluation
Other considerations• Construction activities.• Maintenance of instrument.• Change of procedures.
(i.e. temperature correction; esp. concrete)• Change of equipment or personnel.• Lag time.
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Actions after the analyses• Document the evaluation.• Verify suspect readings and readout calibration.• Verify procedures (I.e. different sensitivity setting).• Duplicate reading.• Notify pertinent personnel• Verify with other instrument type• Ask for visual observation of area• Modify collection schedule• Request additional investigation
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Actions after the analyses
Reporting Requirements Annual instrumentation summary
and evaluation to Division Evaluation to be included in
Periodic Inspections
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Instrumentation Planning
1. Predict controlling mechanism (I.e. Pool)2. Define question to be answered (I.e Cutoff is
90% effective)3. Select parameter to monitor (I.e. piezometric
elevation)4. Predict magnitude of change (I.e. 50 feet)5. Select instrument location (I.e. toe of dam)6. Select instrument7. Select reading frequency8. Data collection and management“Geotechnical Instrumentation for Monitoring Field Performance” Dunnicliff, 1993“Instrumentation of Embankment Dams and Levees” EM1110-2-1908, 30 Jun 1995
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Objectives
Learn various methods of data collection, processing, presentation, evaluation and reporting requirements
Identify various factors that influence dam
safety instrumentation data.
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Conclusion
Perform timely evaluation of data to assure that unsafe performance of a
structure is detected as early as possible.
Instrumentation data is a valuable asset for
the life of the structure.
Backup the data.
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Discussion
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Shelbyville DamPiezometer monitoring example
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Spillway retaining wall
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Open-System Piezometer
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Stilling Basin
Flow
PW-08
PW-09
PW-10
Dam
Cen
terli
ne
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Open-System Piezometer (wellpoint tip)Set in pervious backfillPervious backfill has a drainage collector perforated pipe
PW-08
Collector pipe
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PW-0
8
PW-0
9
PW-1
0
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Piezometer Data Evaluation
What is observed on the plot• Progressive increase in piezometric pressure• Behavior not consistent with previous high pools• Downstream piezometers reflect tailwater (expected)• PW-08 was typically dry (expected)
What factors could be relevant • Time • High pool• Backfill material clogged or collector pipe blockage• Temperature• Coal mine treatment• Piezometer tip clogged or riser cracked
Previous falling head tests (5’ fall in 5 minutes in 2003)
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Piezometer Data Evaluation
What actions could be taken1. Do not assume impending failure of the dam2. Observe the area for distress3. Check visually for instrument damage4. Notify project staff, management, and other pertinent staff5. Perform rising and falling head tests6. Sound bottom of hole7. Use inflatable bladder to test for breaks in the piezometer8. Install additional instrumentation9. Analyze wall stability10. Increase reading frequency11. Automate with alarm callout12. Pump down drainage manhole and camera inspect the pipe13. Further literature research on foundation treatment
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EXERCISE 1: Piezometer Data Evaluation
What would be your recommended threshold for PW-081. Dry2. Tailwater plus 5 feet
What would be your recommended threshold for PW-091. Tailwater plus 5 feet
Which phases of data collection and evaluation could the thresholds be implemented2. Data collection (Automated or Manual)3. Data entry4. Data plots5. Data evaluation