Basics of Water Quality Sheila Murphy
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1 Basics of Water Quality Sheila Murphy
2 Water quality: The chemical, physical, and biological characteristics of water, usually in respect to its suitability for a particular purpose
3 Water quality can include: Basic water quality variables (such as ph, dissolved oxygen, nitrate) Bacteria (such as giardia, E coli) Metals (such as lead, mercury) Pesticides Wastewater-derived organic compounds (hormones, prescription drugs) Fish and macroinvertebrate populations
4 Some basic water quality variables: Temperature Dissolved oxygen ph Nitrate Phosphate
5 Temperature Affects: Fish species present Metabolism and reproduction of fish, macroinvertebrates, and bacteria Dissolved oxygen Measured with: thermometer probe Measurement units: degrees Celsius ( C) degrees Fahrenheit ( F)
6 Dissolved Oxygen (DO) Important indicator of a water body's ability to support aquatic life Fish absorb dissolved oxygen through their gills Measured with: probe and meter titration Measurement units: milligrams per liter (mg/l) AKA parts per million (ppm) percent saturation
7 Dissolved Oxygen (DO) Percent (%) saturation = measured DO (mg/l) maximum DO (mg/l) Maximum DO: maximum amount of oxygen a particular water can hold at equilibrium (depends on elevation and temperature)
8 ph ph = -log [H + ] [H + ]= concentration of hydrogen ions (in moles per liter) In pure water, [H + ]= 1.0x10-7 moles per liter; so log(1.0x10-7 ) = 7.00, and the ph is neutral
9 ph Below ph 5, immature fish and macroinvertebrates may die Above ph 9, fish cellular membranes can be damaged Low ph levels accelerate release of metals from rocks or sediments Measured with: probe ph paper Measurement units: none, or standard units
10 Nitrogen (N) Inorganic forms: Nitrate NO 3 Nitrite NO 2 Ammonia NH 3 and NH 4 + Nitrogen gas N 2 Organic (carboncontaining) forms: Component of proteins, peptides, and amino acids
11 Nitrogen Required by all organisms to live High nitrate & nitrite can cause methemoglobinemia in humans ( blue baby syndrome) and fish ( brown blood disease ) High levels can increase algae growth, leading to low DO and death of fish ( eutrophication ) Measured with: Colorimetry Measurement units: Milligrams per liter (mg/l) as N, NO 2, NO 3, NH 3
12 Phosphorus (P) Required by all organisms to live Usually in the form of phosphate, PO 4 3-, in natural waters High levels can lead to eutrophication Measured with: Colorimetry Measurement units: Milligrams per liter (mg/l) as P or PO 4 3-
13 Nutrients Nitrogen (N) Phosphorus (P) Act as fertilizers Fish kills Eutrophication Oxygen levels get so low that fish can t breathe Bacteria use up oxygen Increased algae growth Algae die Bacteria eat them
14 What affects water quality?
15 Climate/Season
16 Elevation NEDERLAND ELEVATION, IN METERS BOULDER DISTANCE UPSTREAM FROM SAINT VRAIN CREEK CONFLUENCE, IN METERS Lower-elevation waters hold more oxygen because of higher atmospheric pressure
17 Riparian (streamside) vegetation
18 Instream vegetation Photosynthesis 106CO NO 3- + HPO H 2 O + 18H + C 106 H 263 O 110 N 16 P + 138O 2
19 Discharge BOULDER CREEK AT 75TH STREET Jan Apr Jul Oct Jan Apr Jul Oct Jan Apr Jul Oct Jan Apr Jul Oct Jan Apr Jul Oct Jan DISCHARGE (CUBIC FEET PER SECOND)
20 Geology Igneous Rock Sedimentary Rock
21 Forest fires Cheeseman Reservoir after Hayman Fire, 2002
22 Mining Pyrite Iron sulfide, or FeS 2 AKA fool s gold FeS 2 + 7/2 O 2 + H 2 O Fe SO H + Acid! Acid dissolves metals in the rock, and they get into water Like Hg, Fe, Zn, Cu, Pb Can kill fish & make water undrinkable
23 Wastewater Our waste Wastewater Treatment Plant Solids settled out Bugs eat carbon Chlorine kills pathogens Treated wastewater discharged to rivers Sewer pipes
24 Agriculture Greatest nonpoint source pollution problem in the U.S. Fertilizers and pesticides sprayed on crops can get washed into streams and lakes Fertilizer contains nitrate and phosphorus
25 Recreation- instream Swimming Tubing Boating Potential impacts: Bacteria (E coli) Nutrients Pharmaceuticals and personal care products
26 Recreation Off-road vehicles Hiking & camping Dog walking Golf courses Potential impacts: Sediment Bacteria Nutrients Pesticides Pharmaceuticals and personal care products
27 Road runoff Can contribute: Leaked automobile fluids Breakdown of brake pads (metals) Road salt and gravel Spills Trash
28 Industry Before 1972 Clean Water Act, few rules about release of chemicals to water bodies In developing world, industry is often the greatest pollution source Photo from Cleveland Public Library Cuyahoga River, Ohio, in 1952 Thermal pollution: Power plants, chemical factories, and refineries use water for cooling and release warm water back to the environment Valmont Power Plant
29 Burning of Fossil Fuels NO 2 NO 3 SO 2 HNO 3 H 2 SO 4 Acids!
30 Let s look at some data!
31 Temperature along North Boulder Creek-Boulder Creek No data available From
32 Dissolved oxygen North Boulder Creek at Lakewood Res. North Boulder Creek at Lakewood Res. No data available Boulder Creek at 61 st St. Boulder Creek At Highway 287
33 Nitrate + nitrite along North Boulder Creek-Boulder Creek No data available Value exceeds plot scale From
34
35 Discharge BOULDER CREEK AT 75TH STREET Jan Apr Jul Oct Jan Apr Jul Oct Jan Apr Jul Oct Jan Apr Jul Oct Jan Apr Jul Oct Jan DISCHARGE (CUBIC FEET PER SECOND)
36 Effect of discharge on water chemistry Jan Apr Jul Oct Jan Apr Jul Oct Jan Apr Jul Oct Jan Apr Jul Oct Jan Apr Jul Oct Jan DISCHARGE (CUBIC FEET PER SECOND) TOTAL DISSOLVED SOLIDS (MG/L) BOULDER CREEK AT 75TH STREET
37 For more information Boulder Area Sustainability Information Network: U.S. Geological Survey, Water Resources Discipline:
38
39 Dissolved oxygen along North Boulder Creek-Boulder Creek No data available
40 What affects water quality? Natural things like: Climate/season Streamside vegetation Geology Forest fires Discharge (flow rate)
41 What affects water quality? Natural things like:
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