multiple uses of data from an automated … from an automated monitoring network in a 6-mile urban...
TRANSCRIPT
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MULTIPLE USES OFDATA FROM ANAUTOMATEDMONITORINGNETWORK IN A 6-MILEURBAN STORMWATERTUNNEL
BRITTA SUPPESCRWD MONITORING COORDINATOR5/2/2014
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Presentation Outline
1. CRWD Background– Organization– Watershed Description– CRWD Monitoring Program
2. Trout BrookInterceptor/Subwatershed– History– Monitoring Goals– Monitoring Methods– Data & Results– Practical Application
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Capitol Region Watershed District
• Local unit of gov’t
• Drainage area: 41 mi2
– Storm sewer network
– 5 lakes
– 13 mi. of Mississippi
• Population: 245,000
• Highly urbanized– 42%+ impervious
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CRWD Monitoring Program
• Monitoring data foundation of CRWD– 10-yr program
• To Identify water quality problem areas
• Quantify runoff pollutant loading toMississippi R.
• Evaluate BMP performance
• Data for model calibration
• Promote understanding of CRWD waterresources
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MONITORING CASE STUDY:
Trout Brook Interceptor & Subwatershed
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Background:Trout Brook Subwatershed
• 8,000 ac urban subwatershed
• Originally a natural channel– 1900-1950s: Put underground
• Drains to Mississippi R.
• 2 Lakesheds– Como & McCarrons
• Trout Brook Interceptor (TBI)Storm tunnel owned &operated by CRWD
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Trout Brook Interceptor (TBI)
• 6-mile storm tunnel
• 5-12 ft in diameter
• CRWD acquired TBI in 2006
• CRWD has MS4 Permit for TBI– Municipal Separate Storm Sewer System
– Goals:1. Reduce discharge of pollutants2. Protect and improve water quality3. Comply with water quality requirements of Clean Water Act
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TBI Questions --
- How much water is discharging?
- What is the quality of the water?
- What is the quantity of annual pollutant loadsto Mississippi R. from TB subwatershed?
- Are there trends in water quantity and quality?
- Where is the polluted water coming from?
- Does TBI safely & adequetly convey runoff?
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Trout Brook Monitoring
• Monitoring began in 2005 (to present)– 9 year record
• Data to Characterize TB Sub-WS:– Precipitation– Discharge– Water Quality– Stormwater Pond Levels– Lakes:
• Water Quality• Level
– BMP Performance
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Discharge & WaterQuality Stations
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Discharge & WaterQuality Stations
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Storm Event Composite Samples
111122223333444455556666777 7888899991010101011111111121212121313131314141414
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
9AM12 Thu May 2005
12PM 3PM 6PM 9PM 13 Fri 3AM 6AM 9AM
TB-1WESTFlowlink 4 for Windows
ft
5/12/2005 8:16:27 AM - 5/13/2005 11:23:04 AM
Level (0.468 ft)
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Trout Brook Monitoring Stations
LAKES & PONDS:– Lake Water Quality– Level & Discharge– 2 Lakes– 6 Ponds
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Precipitation Gauges
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What is Data Used For?
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What Is Data Used For?
1. Pollutant Loading Calculations:– Discharge, TP, & TSS
2. Hydraulic & Hydrologic Modeling:– Conveyance & surcharge evaluation– Operation & maintenance of TBI
3. Inform Project Design:– Optimal BMP locations– BMP construction– Compliance verification for permits– Tunnel replacement and rehabilitation
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Loading Calculations
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Trout Brook Sub-WS Results
-
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
2005 2006 2007 2008 2009 2010 2011 2012 2013
TS
SL
oad
(lb
s)
Year
Snowmelt
Illicit Discharge
Storm
Base
Total Suspended Solids (TSS)
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Trout Brook Sub-WS Results
CHLORIDE (Cl-)
0
200
400
600
800
1,000
1,200
1/1 2/1 3/1 4/1 5/1 6/1 7/1 8/1 9/1 10/1 11/1 12/1
Cu
mu
lati
veC
l-Y
ield
(lb
/ac)
2013 Mean (2005-2012)
Combined Baseflow + Stormflow
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Regional Uses of Loading Data
• TMDL development:– South Metro Mississippi R.
Turbidity TMDL– Upper Mississippi R. Bacteria
TMDL– Twin Cities Metro Area Chloride
Project
• CRWD Annual Report
• Other regional uses of data:– Research/Academia– Other local orgs or
municipalities
CRWD
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Hydraulic & Hydrologic Modeling
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Hydraulic & Hydrologic Modeling
• XP-SWMM:– Hydraulics within tunnel
– Document conveyance & surcharge issues in TBI
• P8 Model:– BMP Performance
– BMP location identification
• Monitoring data to calibrate & validate models– Models rely on monitoring data
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Project Design
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Project Design
• Trout Brook Nature Sanctuary Project
– Creation of 3,000 ft natural stream channel
– “Daylighting” stormwater
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MONITORING DATA USED for:
• Water source identification & flowcalculations for perennial baseflow
• Diversion structure & lift station design
• Channel & floodplain design
• Stormwater treatment ponds
• Water chemistry– can stream supportaquatic life?
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Project Design
• Repair & Replacement of TBI– Realignment for 35E highway construction– Repair to degraded sections
MONITORING DATA USED for:
• Tunnel Design & Sizing
• Bypass & water diversion structuredesign during construction
• Real-time flow data for day-to-daymaintenance & tunnel entry
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Summary
• TBI monitoring will continue into future– Climate adaptation– Sub-sub watershed monitoring– Remote data access
• A comprehensive monitoring networkis beneficial and allows us to:– Calculate loads– Calibrate/validate models– Inform project design & management
decisions
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QUESTIONS?
Britta SuppesMonitoring Coordinator
Capitol Region Watershed District
www.capitolregionwd.org