evaluating roles for intelligent stormwater …€¦ · evaluating roles for intelligent stormwater...
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EVALUATING ROLES FOR INTELLIGENT STORMWATER CONTROLS IN ADAPTIVE MANAGEMENT OF URBAN STREAMS
Aaron PoreskyAdam McGuire
Richard Boyle Owen Cadwalader
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ACKNOWLEDGEMENTSRichard Boyle
Carrie PakJadene Stensland
Andy Braun
Doug SchuhJeff Van NoteNora Curtis
Marcus QuigleyScott Landers
Alex Bedig
Eric StreckerAdam McGuire
Lucas NguyenBrian Apple
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CLEAN WATER SERVICES STREAM PROTECTION MISSION
• Protect
• Restore
• Enhance
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REAL TIME CONTROL AND MONITORING AS A WATERSHED MANAGEMENT TOOL
Use forecast information and sensor data to actively prepare
and control storage facilities
Monitor facility and watershed conditionsin real-time and assess
performance
Adapt facility operations to meet
performance objectives and watershed needs
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DISTRICT EVALUATION OF RTC
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PILOT PROJECTSButternut Creek – 2014 Bethany Creek Falls – 2015
Retrofit of existing water quality facility Enhancement of a new detention pond, in combination with stream enhancement
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BETHANY CREEK ENHANCEMENT PILOT PROJECT
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BASELINE CONTROL SCENARIO
Peak matching storage2-yr2-yr
10-yr
25-yr
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FLOW CONTROL ENHANCEMENT: PASSIVE
Peak matching storage
Additional “Flow Duration” Storage
Peak matching storage2-yr2-yr
10-yr
25-yr
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TYPICAL ELEMENTS OF RTC APPROACH
Water level sensor
Flow meter
Control panel, communications, camera,
and power supply
Actuated Active Storage Zone
Actuated valve
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On-Site Sensors & Water Control
Systems
Web Interface
Weather Forecast and Other Web Data Tech Company
Boston | Chicago | Kansas City San Francisco | Philadelphia | Portland
20+ Employees
Client/Consultant Specifications
ONLINE SOLUTION
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Flow Duration Storage
2-yr
10-yr25-yr
FLOW CONTROL ENHANCEMENT: ACTIVE
Joint Peak Flow and Flow Duration Storage
No critical forecastCritical forecast
Automated transition between control objectives
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Optical Rain Gage
Control Panel
Battery Backup
Camera
POLYGON AT BETHANY CREEK FALLS
Incremental and cumulative rainfall
Actuated Valve and Pressure
Transducers
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Range of event peak flow reductions:
Active = 40 to 90%
Passive = 0 to 25%
Active
Passive
Plot duration = 19 days Total depth = 6.0 inches Max 12-hour Depth = 1.2 inches
Dry
Example Event Response
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Plot duration = 3 days Total depth = 4.2 inches Max 12-hour Depth = 2.2 inches
Example Event Response
Active
Passive
Active peak flow: 7.5 cfs (50% reduction)
Passive peak flow: 10.5 cfs (25% reduction)
Dry Dry
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Highlights
• 60% reduction in wet weather volume
• 70% reduction in volume within critical flow range
• Increase in residence time from 1 to 19 hours
• 30% lower peak flow in large events
• Ability to adjust control parameters to target alternative goals
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LIFECYCLE COST COMPARISON – EQUIVALENT PERFORMANCE
Cost Summary Passive RTC % Savings(Passive – RTC)/Passive
Total Capital Cost $575,000[$215,000 - $950,000]
$125,000[$100,000 - $150,000]
Annual O&M Costs $4,000[$3,000 - $5,000]
$6,300[$5,500 - $7,000]
Present Value of 25 year Lifecycle Cost
$630,000[$260,000 - $1,000,000]
$210,000[$180,000 -$240,000]
66%[25 to 75%]
Comparison of 4 ac-ft RTC pond to 7 ac-ft passive pond
RTC Summary : 25-year lifecycle cost of $2,000 to $3,000 per tributary acre
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ADDITIONAL COST AND VALUE CONSIDERATIONSIn support of CWS strategic evaluation
Limitations Does not increase absolute
storage capacity of SWM system
Less familiar to designers, contractors, and regulators
Less familiar to O&M crews
Advantages Monitoring data and real-time
performance metrics Ability to adapt operations over time Land savings/denser development for
new and redevelopment Lower frequency of site visits and earlier
identification of maintenance issues
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WATERSHED SCALE VISION
• Retrofit and development applications; in combination with in-stream projects
• Manage facilities based on watershed conditions and resource protection
• Track, adapt, and improve performance over time
Stream gaging, precipitation, and/or
other local data feeds
Distributed RTC facilities and
sensors
Web Data NOAA ForecastUSGS Streamflow