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	Turbidity in Lakes (via CobWeb/3.1 planetlab2.cs.umd.edu) (Site not responding. Last check: 2007-10-13)
		Turbidity refers to how clear the water is. The greater the amount of total suspended solids (TSS) in the water, the murkier it appears and the higher the measured turbidity.
		Turbidity is reported by RUSS in nephelometric units (NTUs) which refers to the type of instrument (turbidimeter or nephelometer) used for estimating light scattering from suspended particulate material.
		Turbidity is most often used to estimate the TSS (total suspended solids as [mg dry weight]/L) in the lake's tributaries rather than in the lake itself unless it is subject to large influxes of sediments.
	lakeaccess.org.cob-web.org:8888 /russ/turbidity.htm (1841 words)

	OzEstuaries; Coastal Indicators - Turbidity
		Turbidity is a measure of water clarity or murkiness.
		The turbidity maximum often occurs in the vicinity of the 2 ppt isohaline [11], and migrates in response to changes in freshwater inflow (see Figure 2).
		Turbidity is estimated either by nephelometry or by directly determining the mass of suspended particulate matter in a given volume of sample.
	www.ozestuaries.org /indicators/turbidity.jsp (1248 words)

	Turbidity Curtain / Silt Fence
		Turbidity curtains are not designed to act as water impoundment dams and cannot be expected to stop the flow of a significant volume of water.
		Turbidity curtains should extend the entire depth of the watercourse whenever the watercourse in question is not subject to tidal action and/or significant wind and wave forces.
		Turbidity curtains should be located parallel to the direction of flow of a moving body of water.
	www.parkersystemsinc.com /siltmaster_booklet.htm (2405 words)

	Ocean Turbidity
		The highly scattering (turbid) water still reflects a lot of light while the highly absorbing water, such as a fl water lake, is very dark.
		Such events are clearly visible on the turbidity image and could be important in assessing the potential impact of toxics adhering to the bottom sediments.
		For areas with consistently high turbidity signals, particularly areas with relatively clear water, part of the signal may be due to bottom reflection.
	www.csc.noaa.gov /crs/definitions/Turbidity.html (810 words)

	Turbidity
		Turbidity is a measure of the degree to which the water looses it’s transparency due to the presence of suspended particulates.
		Turbidity is considered as a good measure of the quality of water.
		A turbidity measurement could be used to provide an estimation of the TSS (Total Suspended Solids) concentration, which is otherwise a tedious and difficult parameter to measure.
	www.lenntech.com /turbidity.htm (465 words)

	WMC: North Santiam River Turbidity Study - Fall 1998
		Turbidity delivered to the reservoir during the flood of February 1996 that remained in suspension and delivered to downstream locations over a protracted period because of the release schedule of the reservoir.
		The results indicated levels of turbidity in the tributary streams of 12 - 21 ntu on February 14 and in several reservoir profiles turbidity levels ranged from 55 ntu at the surface to 389 ntu at a depth of 78.33 meters (257 feet) measured on February 15 and 21.
		Turbidity on the lower North Santiam River is a function of several sources that differ in frequency and distribution.
	www.watershed.org /news/fall_98/1_turbidity_study.html (7445 words)

	The Traverse Project: Watershed Management Section (Site not responding. Last check: 2007-10-13)
		Turbidity is caused by inputs of suspended and dissolved solids in the water which decreases the amount of light penetration.
		Turbidity interferes with the growth of aquatic organisms by decreasing light levels needed for photosynthesis; and contributing to decreased oxygen concentrations and increased water temperature, which may stress aquatic organisms.
		Materials causing turbidity may also be responsible for clogging fish gills, reducing available habitat, interfering with egg and larvae development, smothering fish eggs and aquatic insects larvae, and suffocating newly-hatched insect larvae.
	www.iwr.msu.edu /edmodule/water/turbid.htm (139 words)

	OMEGA ENGINEERING - Turbidity Measurement
		This article defines turbidity, how it is measured, and the effects that suspended particle size, shape, distribution, and stray light have on the turbidity measurement.
		Turbidity is defined as an "expression of the optical property that causes light to be scattered and absorbed rather than transmitted in straight lines through the sample."1 Simply stated, turbidity is the measure of relative sample clarity.
		Turbidity measurements provide a reading of the amount of scattered light and cannot be directly related to a gravimetric equivalent unless a working curve for the specific sample is created.
	www.omega.com /techref/ph-6.html (1962 words)

	Water Resource Characterization DSS - Turbidity
		General Information: Turbidity is a unit of measurement quantifying the degree to which light traveling through a water column is scattered by the suspended organic (including algae) and inorganic particles.
		Recreational Effects: Highly turbid waters may be hazardous to the welfare of swimmers and boaters.
		Turbidity is often largely due to suspended sediment in the water column.
	www.water.ncsu.edu /watershedss/info/turbid.html (758 words)

	Turbidity Testing (Site not responding. Last check: 2007-10-13)
		Turbidity is a measure of the waters lack of clarity.
		If turbidity is largely due to algae, light will not penetrate very far into the water, and primary production will be limited to the uppermost layers of water.
		Turbidity is measured using a Vernier Turbidity sensor.
	www.marshfield.k12.wi.us /science/chem/river/turbidity.htm (565 words)

	Measuring Turbidity (Site not responding. Last check: 2007-10-13)
		It is often increases in the turbidity, particularly in frequency or longevity, that are cause for concern.
		Assessment of turbidity using turbidity tubes is useful because potential runoff problems might be noted by assessing turbidity on a regular basis, specifically before, during and immediately after rain storms.
		Turbidity can be measured in the laboratory with a meter, called a nephelometer, which measures the amount of light scattered by particles in the water in nephelometric turbidity units (NTUs).
	clean-water.uwex.edu /wav/monitoring/turbidity/index.htm (553 words)

	Turbidity
		The particulate matter carried by a stream determines its turbidity, or the relative muddiness or cloudiness of the water.
		A transparency of >60 cm is roughly equivalent to a turbidity of <10 NTU.
		Turbidity and transparency can also be related to total suspended solids and streamflow results for specific streams or rivers.
	www.uwgb.edu /watershed/data/monitoring/turbidity.htm (384 words)

	Clarity and Turbidity (Site not responding. Last check: 2007-10-13)
		Turbidity or cloudiness in water is caused by suspended solid matter, which limits sunlight’s ability to pass through water.
		Turbidity also reduces visibility for fish that are sight breeders or egg layers, clogs gills of organisms not adapted to a certain levels of turbidity, smothers benthic creatures and eliminates habitat spaces.
		High turbidity and low clarity is an indicator of either runoff from disturbed or eroded soil or blooms of microscopic organisms due to high nutrient inputs.
	www.njmsc.org /Education/Lesson_Plans/Clarity_and_Turbidity.htm (645 words)

	Turbidity and Total Suspended Solids Surfacewater Monitoring
		Turbidity is the reduction of clarity in water due to the presence of suspended or colloidal particles.
		Turbidity of natural waters tends to increase during runoff events as a result of increased overland flow, stream flow, and erosion.
		A less expensive method of measuring turbidity is to evaluate the fuzziness of a mark at the bottom of a clear tube when a water sample is poured in the tube.
	www.water-research.net /Watershed/turbidity.htm (857 words)

	Series A15/76 Turbidity Monitor from Analytical Technology
		Turbidity is a general indicator of the optical clarity of water and is defined as the amount of light scattered from particles in solution.
		The turbidity sensor used in the A15/76 is a planer sensor with the light source and photo detector mounted on a flat face.
		Because turbidity measurement is often required in wastewater effluents and other applications where sensor fouling can be a major problem, ATI offers a special turbidity unit, the D15/76 system, that uses an "air blast" sensor cleaning system that automatically cleans the sensor as often as necessary to maintain reliable measurements.
	www.afcintl.com /water/turbidity.html (968 words)

	EPA > OWOW > Monitoring and Assessing Water Quality > Volunteer Stream Monitoring: A Methods Manual > ...
		Turbidity is a measure of water clarity how much the material suspended in water decreases the passage of light through the water.
		Turbidity is not a measurement of the amount of suspended solids present or the rate of sedimentation of a steam since it measures only the amount of light that is scattered by suspended particles.
		A turbidity meter consists of a light source that illuminates a water sample and a photoelectric cell that measures the intensity of light scattered at a 90 angle by the particles in the sample.
	www.epa.gov /volunteer/stream/vms55.html (1218 words)

	Fact Sheet - Turbidity
		Turbidity, like transparency, is a measure of water clarity (how far light can travel through water).
		Turbidity is measured by an instrument called a nephelometer and is reported in nephelometric units (NTUs).
		Graph of turbidity (NTU) for the Red River in the Fargo-Moorhead metro area for the period July 2001 to April 2003.
	www.eerc.und.nodak.edu /watman/FMRiver/PPTV/turbidity.asp (345 words)

	Turbidity Threshold Sampling
		Turbidity threshold sampling is an automated procedure for measuring turbidity and sampling suspended sediment.
		Estimation of suspended sediment flux in streams using continuous turbidity and flow data coupled with laboratory concentrations.
		Turbidity and suspended solids variations downstream of a regulating reservoir.
	www.fs.fed.us /psw/topics/water/tts (1014 words)

	Turbidity
		Turbidity is one of the most important parameters used to determine the quality of drinking water.
		Turbidity is a unit of measurement quantifying the degree to which light traveling through a water column is scattered by the suspended organic (including algae) and inorganic particles.
		Highly turbid waters may be hazardous to the welfare of swimmers and boaters.
	webpages.charter.net /kwingerden/erhs/aquarium/turbidit.htm (798 words)

	Turbidity - The Global Water Sampling Project (Site not responding. Last check: 2007-10-13)
		Turbidity refers to how clear or how cloudy the water is. Clear water has a low turbidity level and cloudy or muddy water has a high turbidity level.
		High levels of turbidity can be caused by suspended particles in the water such as soil, sediments, sewage, and plankton.
		The turbidity level is measured in Jackson Turbidity Units (JTU).
	www.k12science.org /curriculum/waterproj/turbidity.shtml (578 words)

	Turbidity (Site not responding. Last check: 2007-10-13)
		Significance: Turbidity is a measure of how much material is suspended or contained in water or a body of water.
		Turbidity is a measure of how much material is suspended or contained in a creek or body of water.
		Turbidity is the measure of how much material is suspended in the body of water.
	www.switzerland.k12.in.us /watershed/turbid.html (593 words)

	Turbidity current - Wikipedia, the free encyclopedia
		The term "turbidity current" is most commonly used to describe underwater currents in lakes and oceans, which are usually triggered by earthquakes or slumping.
		Turbidity currents are characteristic of areas where there is seismic instability and an underwater slope, especially submarine trench slopes of convergent plate margins and continental slopes and submarine canyons of passive margins.
		Investigators suggested that a 60-mile-per-hour (100 km/h) submarine landslide or turbidity current of water saturated sediments swept 400 miles (600 km) down the continental slope from the earthquake’s epicenter, snapping the cables as it passed.
	en.wikipedia.org /wiki/Turbidity_current (313 words)

	Turbidity Threshold Sampling Instrumentation
		Turbidity threshold sampling collects physical samples that are distributed over a range of rising and falling turbidities (Lewis and Eads: 1996, 1998 and 2000).
		Turbidity is an optical measure of the number, size, shape, and color of particles in suspension.
		Turbidity thresholds are selected by taking into consideration the maximum expected turbidity value for a stream, the range of the turbidity probe, and the number of desired physical samples based on the magnitude of the storm.
	www.fs.fed.us /psw/topics/water/tts/tts_inst.html (1882 words)

	DuluthStreams - turbidity
		Turbidity is a water quality parameter that refers to how clear the water is. The greater the amount of total suspended solids (TSS; also called total suspended sediment) in the water, the murkier it appears and the higher the measured turbidity.
		Measuring turbidity in streams is extremely important as an indicator of the concentration of suspended sediments in the water.
		Turbidity varies seasonally, and in larger bodies of water with depth, in response to natural and human-caused physical, chemical and biological changes in streams and lakes.
	www.duluthstreams.org /understanding/param_turbidity.html (2261 words)

	It's time to revisit the turbidity standard
		Turbidity in surface waters is caused by fine suspended and colloidal material; turbidity prevents light penetration and gives water a cloudy appearance.
		Turbidity may be due to microorganisms or other organic matter in the water, but in areas of North Carolina with erodible soils, it is often caused by fine soil particles such as silt and clay.
		If the levels of turbidity in the standard are often violated downstream of land disturbance activities that are served by approved but ineffective BMPs, then the implication is that the additional erosion control costs to meet the numeric NTU levels are not justified by the expected benefits.
	www.ncsu.edu /ncsu/CIL/WRRI/news/mj00dirforum.html (467 words)

	Turner Designs Turbidity - Fluorometers (via CobWeb/3.1 planetlab2.cs.umd.edu) (Site not responding. Last check: 2007-10-13)
		Turbidity is described as "an expression of the optical property that causes light to be scattered and absorbed rather than transmitted in straight lines through the sample" (Standard Methods, 1995).
		Turbidity can also be measured as a parameter to simply characterize a body of water.
		Turbidity also provides a substrate and interferes with treatment of water, therefore promoting microbial growth, allowing for the presence of disease causing organisms such as bacteria, viruses, and parasites that can cause nausea, cramps, diarrhea, and associated headaches.
	www.turnerdesigns.com.cob-web.org:8888 /t2/doc/appnotes/turbidity.html (260 words)

	Turbidity - Tips (Site not responding. Last check: 2007-10-13)
		WAV's turbidity tubes have been calibrated in a similar fashion to Morgan's (see the Aussie history in the Volunteer Monitor) and the conversion to turbidity units (approximately equal to NTUs) from inches is found on the back of both the turbidity data sheets and the fact sheet.
		Organisms within the stream are generally adapted to the level of turbidity (and resulting temperature regime) that is "normal" in the stream.
		Turbidity samples can also be collected (and often are) by simply using the turbidity tube and plunging it into the stream as the directions state for collecting a sample with a bucket.
	clean-water.uwex.edu /wav/monitoring/turbidity/turbtips.htm (606 words)

	DOUGHERTY GAP: Evidence for a Turbidity Current Paleoenvironment
		The turbidity current depositional environment suggested by the writers for this site is presently not recognized by uniformitarian geologists because their current model requires a coastal swamp paleoenvironment to explain the occurrence of coal layers found in adjacent overlying strata.
		However, if the sands were deposited in turbidity currents with the clays serving as the trace maker substrate, then the sandstones would serve as sole casts and would reflect the bioturbated nature of the clays.
		The thickness of the individual sandstone layers in turbidity current deposits is estimated to be a function of the location of the deposit within the deep-sea fan or along the continental shelf edge (i.e., proximal versus distal; see Walker, 1967).
	www.creationresearch.org /crsq/articles/32/32_4a1.html (6803 words)

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