Real-time Water Quality Monitoring

Transcription

1 Real-time Water Quality Monitoring Amanjot Singh, Ph.D., P. Eng. Water Quality Engineer Credit Valley Conservation Authority November 14, 212

2 Focus Current sampling methods their objectives and limitations Real-time water quality monitoring how it works CVC s Real-time water quality network Examples Issues Silt Smart Protocol

3 Traditional Sampling: Objectives and Limitations Grab sampling 5 Stable/lowflow conditions (ambient) 4 Help calibrate models for lowflow condition 3 Not suitable for non events 2 Labour intensive 1 Expensive lab analysis Event sampling Date Neither capture diurnal changes e.g. Dissolved Oxygen During a storm event Develop Event Mean Concentrations (EMC) Help calibrate models for storm events May not capture peaks or events of varying intensities and durations Labour intensive Expensive lab analysis Total Suspended Solids (mg/l) Jun/11 Jul/11 Aug/11 Sep/11 Oct/11 Model Calibration Challenges due to sparse sampling points

4 So, What is the Alternative Approach Water Quality Sonde for continuous monitoring Parameters Water temperature Dissolved oxygen ph Conductivity Chlorides Turbidity Air Temperature Water Level

5 Additional Objective Capture what is missed by the grab samples Spills Diurnal variations Chlorides Long-term trends climate change Construction (Erosion)

6 How do Real-time Stations Work

7 Automatically plotted after every 15 min Real-time Stations Structure Onsite Data Logger and GSM Cellular Modem Water Quality Probe Datagarrison.com Remotely connected

8 Typical Setup Air Temperature Probe Rain Gauge Data Logger Cellular Modem

9 CVC s Real-time WQ Network

10 Examples

11 Event Response Water Level and Turbidity Response September 23 rd Storm-

12 Observed Rainfall 7 CVC-Office (4mm) MGCCC (32mm) 6 5 Rainfall (mm) /9/211 12: -1 21/9/211 : 21/9/211 12: 22/9/211 : 22/9/211 12: 23/9/211 : 23/9/211 12: 24/9/211 : 24/9/211 12: 25/9/211 : 25/9/211 12:

13 Flow and Turbidity Response Sept 23 rd Storm MGCCTurbidity(NTU) (NTU) OldDerry Turbidity FletchersTurbidity(NTU) Turbidity (NTU) Turbidity (NTU) Turbidity CooksvilleTurbidity(NTU) (NTU) CooksvilleWater Level (m) FletchersWater Level (m) OldDerry Water Level (m) Cooksville Cr Fletcher s Cr Credit River u/s Urban Streams MGCCWater Level (m) Credit River d/s Urban Streams Water Level (m) Water Level (m) Water Level (m) Water Level (m) One Week Plot 19-Sep 2-Sep 21-Sep 22-Sep 23-Sep 24-Sep 25-Sep 26-Sep 27-Sep 28-Sep

14 Dissolved Oxygen

15 Dissolved Oxygen Lower Levels

16 Real-time WQ (DO vs Water Level) Dissolved Oxygen (mg/l) Water Level (m) 9-Aug Aug Aug Aug Aug Aug Aug Aug Aug Aug Aug-12 DO WaterLevel

17 Real-time WQ (DO vs Turbidity) Dissolved Oxygen (mg/l) Turbidity (NTU) 9-Aug 11-Aug 13-Aug 15-Aug 17-Aug 19-Aug 21-Aug 23-Aug 25-Aug 27-Aug 29-Aug DO Turbidity

18 Chlorides and Conductivity

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20 Turbidity

21 Real-Time Station: Cooksville Creek

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23 Water Quality Modeling Simulations Vs Real-time Monitored Total Suspended Solids and Total Phosphorus

24 Real-time Estimated Vs Modelled Total Suspended Solids Estimated and Modelled TSS Concentration 5 Total Suspended Solids (mg/l) Jun/11 Jul/11 Aug/11 Sep/11 Oct/11 Date Estimated TSS Concentration (mg/l) Modelled TSS Concentration (mg/l) Measured TSS Concentration (mg/l) Estimated and Modelled TSS Loading 5 Total Suspended Solids (tonnes/hr) Jun/11 Jul/11 Aug/11 Sep/11 Oct/11 Date Estimated TSS Loading (tonnes/hr) Modelled TSS Loading (tonnes/hr)

25 Real-time Estimated Vs Modelled Total Phosphorus Estimated and Modelled TP Concentration 1.8 Total Phosphorus (mg/l) Jun/11 Jul/11 Aug/11 Sep/11 Oct/11 Date Estimated TP Concentration (mg/l) Modelled TP Concentration (mg/l) Measured TP Concentration (mg/l) Estimated and Modelled TP Loading 2 Total Phosphorus (kg/hr) Jun/11 Jul/11 Aug/11 Sep/11 Oct/11 Date Estimated TP Loading (kg/hr) Modelled TP Loading (kg/hr)

26 Issues

27 Turbidity Fluctuations Dissolved Oxygen and Turbidity Dissolved Oxygen (mg/l) Turbidity (mg/l) 5. Sep/1 Sep/3 Sep/5 Sep/7 Sep/9 Sep/11 Sep/13 Sep/15 Sep/17 Sep/19 Sep/21 Sep/23 Sep/25 Sep/27 Sep/29 Oct/1 Day DO (mg/l) Turbidity (mg/l) Turbidity (NTU) Turbidity and Water Level Water Level (m). Sep/7 Sep/9 Sep/11 Sep/13 Sep/15 Sep/17 Day Turbidity (NTU) Water Level (m) Precipitation

28 Monthly Reporting

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30 Silt Smart

31 SILT SMART - Objective

32 Protocol Application High Risk Construction Projects Development site > 25ha Sites at risk due to location and type of construction (slope, soil type etc.) Sensitive Streams Redside Dace Habitat Spawning and Nursery Habitat for Coldwater Species

33 Rationale

34 Alarm Triggers with two Real-time Stations Onsite Data Logger and GSM Cellular Modem Site A Onsite Data Logger and GSM Cellular Modem Site B Remotely Third Party Server Water Quality Probe A (Upstream) Site A Site B Water Quality Probe B (Downstream ) Alert /SMS Triggers When Site B turbidity - Site A Turbidity > Threshold

35 Occurrence Scenario Alerts Occurrence Occurrence Occurrence Scenario 1 Scenario 2 Scenario 3 Occurrence Two consecutive turbidity measurements of 5 NTU above background Turbidity is 5 NTUs above background for 1 hours or more Two consecutive turbidity measurements greater than 33 NTUs above background

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