Choosing BMPs and Monitoring Them. James Houle and Tim Puls, UNH Stormwater Center

Transcription

1 Choosing BMPs and Monitoring Them James Houle and Tim Puls, UNH Stormwater Center

2 Choosing BMPs

3 Both Willow Brook and this reach of the Cocheco River are listed as impaired for aquatic life(ph) and Primary Contact (E.coli) uses. It Depends.

4 Welcome to Willow Brook 2515 acres impaired for aquatic life (ph) Primary Contact (E.coli) uses

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6 Distribution of Land Use Type

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8 IC Targets Over Time for WB Implementation Rates Current (0.79 Ac/yr) 50 Yr (3.0 Ac/yr) 40 Yr (3.75 Ac/yr) 30 Yr (5.0 Ac/yr) 20 Yr (7.75 Ac/yr) 10 Yr (15.0 Ac/yr) 2012 Impervious Cover Beginning 15.91% 15.91% 15.91% 15.91% 15.91% 15.91% Yrs to Implementation Total % IC Disconnected Per Year Total Acres Treated Per Year % 0.12% 0.15% 0.20% 0.31% 0.60%

9 Use Updated Resources

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11 RLBCI (Red Lake Band of Lake Superior Chippewa) Nonpoint Source Assessment of Streams, Lakes and Wetlands. Red Lake Band of Chippewa Indians, Red Lake, MN.

12 Synthesis

13 Plan Implement Monitor

14 Pre and Post BMP Monitoring University of New Hampshire Stormwater Center Timothy Puls, James Houle, Thomas Ballestero

15 Establishing an Approach Objective of Monitoring Time, Money, and Resources Available Equipment Selection

16 Monitoring Objectives What are the parameters or pollutants of concern? What are the intended treatment goals? What level of sophistication is required to establish evidence of success?

17 Available Resources Personnel Time Personnel Experience Level Budget

18 Equipment Selection Wide Range of Available Options Addressing first two questions will help narrow down equipment options Simple to Complex

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20 The UNH Stormwater Center 7

21 UNH WEST EDGE LOT Watershed Boundary Main UNH SC Research Facility TREE FILTER POROUS ASPHALT 8

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23 POROUS ASPHALT TREE FILTER 10

24 TREATMENT STRATEGIES: Conventional Devices Retention Pond 2004 to 2006 Detention Pond 2006 to present Rock Lined Swale Vegetated Swale Veg Swale with Engineered Filter Berm Rip Rap Swale Retention Pond 11

25 TREATMENT STRATEGIES: Manufactured Devices Tested : ADS Subsurface Detention System, Aqua Swirl and Aqua Filter; VortSentry, CDS, V2b1, ADS Isolator row Tested 2006 present: Stormtech Isolator Row; HIL Up Flo Filter, HIL Downstream Defender, VortSentry, Deep Sump Catch Basin Hydrodynamic Separator Subsurface Infiltration Unit Filter Unit 12

26 Infiltration and Filtration Systems Porous Asphalt Pervious Concrete Gravel Wetland Sand Filter Bioretention Cell Tree Filter Subsurface Infiltration Unit 13

27 BMP Monitoring: How We Do It QAPP Governed Protocol 1. Runoff is sampled 2. Influent enters distribution chamber 3. Equal volumes flow out to systems 4. Influent flows through systems 5. Effluent leaves system 6. Effluent enters sampling gallery

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29 Real Time Automated Samplers 16

30 Site Considerations Power Outfall Type: Pipe, Box Culvert, Tidal, etc. Rural or Urban Vandalism and Security Equipment Access Seasonal Accessibility

31 Site Monitoring Real Time Precipitation Flow ph Temperature Conductivity Dissolved Oxygen Turbidity Discrete Samples Metals Petroleum Hydrocarbons Sediment Anions and Cations Nutrients Microorganisms 18

32 Remote Monitoring

33 Flow weighted composites Freeze or send for analysis Flow weighted composites

34 Know Hydrology Understand the runoff (rain, snowmelt, etc.) characteristics of the watershed to the location of monitoring Time of concentration Lag CN Unit hydrograph peak discharge Base flow Land use 21

35 Flowlink Graph

36 Water Quality Estimate the water quality characteristics of what you are attempting to monitor Maximum Minimum Median Variance Memory Sources 23

37 Measurement Know the analytical capabilities of equipment/lab Detection level Accuracy Precision Reliability 24

38 Data Build and maintain the data vault Access Entry Logs QA 25

39 Objectives Bad Examples Will this impair the creek? Too vague Possibly many other causes of impairments How is this answered? Is this a good design? Is monitoring a necessity to answer? Non quantifiable statement Units of measure When answered? 26

40 Objectives Good Examples Is the design meeting the infiltration goal? Infiltration goal established (say equal to predevelopment) At what point in time is question answered? Is stormwater meeting compliance (for some target contaminant)? Simple metric At what point in time is question answered? 27

41 DO NOT THINK LIGHTLY ABOUT FLOW MEASUREMENT Discharge is considered a no brainer Reality is that accuracy is problematic Cannot do a good mass balance without excellent flow monitoring Often measure water level or depth and convert 28

42 Effective Sample Collection BE PREPARED!! Clean containers Purging Representative Preservation Chain of Custody If you really want to understand the importance of each sample, ask yourself, What is it worth to me for this sample to be lost? 29

43 Expect the unexpected

44 Quality Assurance Duplicates Spikes Double checks QA officer Review Data Frequently 31

45 Dissemination Final report Project updates Public presentations Professional presentations 32

46 Questions