Presentation on theme: "Turtle Lake Water Quality Index"— Presentation transcript:
1 Turtle Lake Water Quality Index Turtle Lake Watershed Inc.June 13, 2005
2 Water Quality Monitoring Gathers and collects dataProvides information on current conditionsCan show trends in water quality over timeProvides information on which to make decisions
3 Water Quality Monitoring Monitoring programs can be established for a variety of different reasonsThe parameters monitored can tell us different things about the water qualityParameters can be related to one anotherEach piece of information can be used to provide an overall assessment of the water quality
4 Water Quality DataIndividual parameters are compared to some form of standard/objective (Saskatchewan Surface Water Quality Objectives)Usually based on intended use of the water (protection of aquatic life, irrigation, recreation, livestock watering)
5 Water Quality DataParameters that are within the Surface Water Quality Objectives would be considered suitable for a particular intended use.
7 Dissolved Oxygen (DO) All Aquatic organisms require oxygen to live Fish, invertebrates, plants, and aerobic bacteriaObjectives set DO levels at 5 mg/L for the protection of fish and aquatic lifeLevels below 3 mg/L can be stressful for most aquatic organisms;Levels below 1 mg/L are considered to be anoxic (no oxygen present)
8 Total Phosphorous Is an essential nutrient for plant and animal growth Occurs naturally in the environmentEnters water bodies as a result of surface run-off, soil erosion, decay of organic matter, and wasteHigh phosphorous levels can stimulate algal and weed growth (TP greater than 0.1 mg/L)
9 Nitrogen Occurs in several forms in water Ammonia, nitrate, nitrite, and organically boundIt is an important plant nutrientAmmonia nitrogen is used as an indicator of the quality of the water for aquatic lifeHigh ammonia concentrations can be toxic to fishNitrate levels are typically less that 1 mg/L in healthy surface water systems
10 Total Dissolved Solids (TDS) Is a measure of the amount of dissolved material in waterBicarbonate, sulphate, chloride, calcium, magnesium, sodium, and potassiumConcentration of TDS depends on:The amount of precipitation a water body receivesThe type of solid and rock the water passes overHuman activitiesTDS levels for irrigation should not exceed 700 mg/LTurtle Lake TDS values range between mg/L
11 Turbidity Indicates the amount of suspended material in water Soil particles, algae, or other microscopic organismsHigh turbidity reduces light penetration, productivity and habitat qualitySuspended sediment can carry nutrients, metals, and pesticides
12 Heavy MetalsCan be toxic to the aquatic environment at elevated levelsSome metals can bio-accumulate, e.g. mercuryOccurs naturally in the environmentEnters water bodies as a result of surface run-off, soil erosion, or improper waste disposalCan restrict water use
13 Algal Blooms Common in nutrient-rich surface waters Main types include:Green algae, diatoms, and blue-green algae (cyanobacteria)Green algae and diatoms = nuisance organismsPlug irrigation equipment, affect recreation, treatment plant operations, and can produce taste and odour compoundsBlue-green algae = toxic organismsProduce neuro- and hepato-toxins
14 Fecal Coliforms Used as an indicator of the sanitary quality of water Found in the intestinal tract of human and other warm blooded animalsA high fecal coliform count indicates water contaminationFor recreational use of a water body, levels should not exceed mean density of 200 organisms per 100 mL, must be absent in drinking water
16 Water Quality IndexThe WQI is a simple tool that can be used to summarize and report on complex water quality monitoring data
17 What is the Water Quality Index? It is a mathematically calculation that combines a number of water quality factors and then ranks the water quality in a simple and easily understood wayIt can be used to report on the overall and on-going condition of a water body in a way that can be used by technical and non technical people
18 Development of the Water Quality Index The Canadian Water Quality Index was developed by a Federal/Provincial Taskforce for the Canadian Council of Ministers of the EnvironmentIt was based on an index developed by British Columbia - Ministry Environment, Land and Parks
19 CWQIThe Water Quality Index is based on a combination of three factors:the number of variables whose objectives are not met (scope)The frequency with which the objectives are not met (frequency) andThe amount by which the objective is not met (amplitude)
20 Water Quality IndexCombining all water quality parameters the water quality index produces a number between 0 and 100, where 0 represents the “worst” water quality and 100 represents the “best” water quality.
21 CWQI Excellent: (CWQI Value 95-100) – water quality is protected with a virtual absence of threat or impairment; conditions very close to natural or pristine levels.Good: (CWQI Value 80-94)– water quality is protected with only a minor degree of threat or impairment; conditions rarely depart from natural or desirable levels.
22 CWQI Fair: (CWQI Value 65-79) – water quality is usually protected but occasionally threatened or impaired; conditions sometimes depart from natural or desirable levels.Marginal: (CWQI Value 45-64)– water quality is frequently threatened or impaired; conditions often depart from natural or desirable levels.
23 CWQIPoor: (CWQI Value 0-44) – water quality is usually threatened or impaired; conditions usually depart from natural or desirable levels.
24 Saskatchewan Water Quality Index for use in Watershed Protection Parameters used in the SWA Water Quality IndexTotal Dissolved SolidsSulphateChlorideSodiumNitrate/nitriteAmmoniaTotal PhosphorousChromiumMercuryAluminumArsenicpHDissolved oxygenChlorophyll aMCPA2, 4-DFecal coliforms
27 Water Quality Index Turtle Lake Turtle Lake water quality rated as Good (WQI value 90.1)– water quality is protected with only a minor degree of threat or impairment; conditions rarely depart from natural or desirable levels.
28 Turtle Lake Summary Water Quality Index rating was good Parameters that exceeded the WQI objectives the most were pH and TDSIn 2004:pH 8.83 – 9.38TDS , 750
29 WQI SummaryProvides a simple ranking system to evaluate water quality - although some interpretation is still required.Can be used to assess overall watershed health and assess changes in water quality over time