Sheetflow

August 26, 2011

Analyzing Stormwater for Turbidity Using a Transparency Tube

Filed under: Video — Sheetflow @ 7:00 am

According to NPDES regulations governing the Construction Stormwater General Permit, stormwater runoff from projects between 1 and 5 acres can be monitored for turbidity using a transparency tube.

Video clip courtesy of:Washington State Department of Ecology.

The entire video can be seen at: Construction Stormwater Monitoring Video

August 19, 2011

Analyzing Stormwater for Turbidity Using a Turbidimeter

Filed under: Video — Sheetflow @ 7:00 am

Now that you know what turbidity is and how to calibrate a turbidity meter, it’s time to take some measurements.

Video clip courtesy of:Washington State Department of Ecology.

The entire video can be seen at: Construction Stormwater Monitoring Video

August 12, 2011

Calibrating a HACH 2100 P Turbidimeter

Filed under: Video — Sheetflow @ 7:01 am

Last week’s post explained turbidity. Here is how to calibrate a Hach 2100P turbidimeter so you can measure the turbidity of a water sample.

Video clip courtesy of:Washington State Department of Ecology.

The entire video can be seen at: Construction Stormwater Monitoring Video

August 5, 2011

Turbidity Explained

Filed under: Video — Sheetflow @ 7:00 am

The Washington State Department of Ecology has put together a fine video on construction stormwater monitoring. Over the next several weeks, I will be posting clips from the video. The first clip is about turbidity. A device called a turbidimeter is used to determine the cloudiness of the water sample by shining light through the sample and measuring how much light passes through the sample. The meter measures nephelometric turbidity units (NTUs), the lower the number, the more clear the water sampled. Natural waters measure below 10 NTUs and frequently below 5 NTUs. Drinking water is even lower, less than 1 NTU. Untreated construction stormwater runoff can easily measure over 1000 NTUs, which looks like a a light coffee drink.


Video clip courtesy of:Washington State Department of Ecology.

The entire video can be seen at: Construction Stormwater Monitoring Video

In memory of Cyril Amos Jenkins, born this day in 1921.

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