ric lawson watershed planner huron river watershed council micorps staff
TRANSCRIPT
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Ric LawsonWatershed Planner
Huron River Watershed CouncilMiCorps Staff
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OutlineStormwater monitoring: what is it and why
should I care?
Basic training: stormwater bootcamp
What’s in it for me? Benefits
But does it work? A case-study
Huh? Conclusions and questions
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Why stormwater mattersOne of the top pollutant sources nationally.
It affects everyoneStormwater regulations expanding
Non-point becoming point sourceRegulations now require monitoring and
TMDL planningPhosphorus and E. coliMunicipalities often ill-equipedWatershed monitoring acceptable
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Stormwater monitoring 101Focus on impairments firstMap regulated stormwater
drainage area and network as best as possibleMajor tributariesDeveloped areas, land useOutfalls
Select sites to bracket potential sources
Long-term and “investigative” sites
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Stormwater monitoring 101What and when to monitor
What: impairments/threats, surrogates, flow?When:
Wet vs. dry Sample size and variability
Laboratory coordinationCapacity and timingDetection limitsLogistical considerations
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Volunteer ConsiderationsSample handling and processing training.
Flow?Scheduling volunteers
Not many neededRegular schedule vs. rain events
Safety concernsWeatherHigh flows
Data processing
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Benefits (and challenges)GoodMandated monitoring (in some areas)Data collection opportunity: discover issuesFund, promote, expand monitoring effortsBring communities together: accountabilityBadComplicated program Regulatory responsibilityExpensive
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Case-study: Huron RiverTwo county stormater groupsImpairments for phosphorus and E. coliExisting program in one county for baseline
monitoringExpanded to include wet-weather and
stormwater investigationsModel for state ambient stormwater
monitoring
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Middle Huron Tributary MonitoringVolunteer-assisted program to monitor
tributary sites in the TMDL watershed (Middle Huron)
Focus on nutrients and stream flow to calculate loading
Monthly sampling May-SeptemberAdded storm sampling starting in 2007
Funded by Middle Huron PartnersMDNRE funding 2008-2010
Lab analysis by Ann Arbor WTP
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Parameters EvaluatedpHConductivityDOE. coliTotal PhosphorusTotal Suspended SolidsNitrate-Nitrite
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N
EW
S
Middle Huron Initiative Project Area
Ingham Co. Livingston Co. Oakland Co.
Wayne Co.
Monroe Co.
Washtenaw Co.Jackson Co.
Huron River Watershed
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TP Loading in the Middle Huron
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Mean [TP] ComparisonsSite(s) [TP] (mg/l)
2003-06[TP] (mg/l) 2008-09
T-test Probability
% Reduction
Non-Ann Arbor
0.048 0.036 0.01 24
Ann Arbor 0.072 0.047 <0.01 35
Traver Creek
0.069 0.046 <0.01 33
Swift Run 0.095 0.040 <0.01 58
Honey Creek
0.063 0.035 <0.01 45
Allens Creek
0.073 0.054 0.07 26
Malletts Creek
0.076 0.059 0.09 23
Superior Drain
0.070 0.043 0.03 38
Note: Baseline samples only. Only sites with p<0.10 are shown.
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5/13/10 12:00 AM 5/13/10 4:48 AM 5/13/10 9:36 AM 5/13/10 2:24 PM 5/13/10 7:12 PM 5/14/10 12:00 AM
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Rain (inches)
Glazier Flow (cfs)
Plymouth Flow (cfs)
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4/4/03 6:00 AM 4/4/03 1:12 PM 4/4/03 8:24 PM 4/5/03 3:36 AM 4/5/03 10:48 AM 4/5/03 6:00 PM
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Rain (inches)
Glazier Flow
Plymouth Flow
2010
Total Rain: 0.62 inches in 2 hours prior to highest flow
0.97 inches total of rain received on May 11-May 13.
2003Total Rain: 0.6 inches in 2 hours prior to highest flow
1 inches total of rain received on April 4
Prior moisture conditions: In 2003, off and on rains occurred throughout the day of the storm. In 2010, off and on rain occurred throughout 2 days prior to the storm. Both years had substantial rains 6 days prior to dates shown on graph.
Note: plymouth transducer was offline
Storm Comparison #1: Hydrographs
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ConclusionsTotal Phosphorus concentrations have
decreasedDecreases significant in urban tributariesTributaries respond differentlyStorm samples are different from baselineFlow differences can be detectedToo early for investigative results or
conclusions