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Assess Turbidity in Water
As explained [in @donblair's primer](/notes/donblair/08-25-2015/turbidity-001), measuring turbidity means "measuring the amount of suspended solids in water -- solids that haven't fully dissolved". That is, "turbidity, an optical technique for assessing suspended solids in liquid -- is an important water quality parameter. Typically, light is shone into a liquid sample, and the amount of light scattered back out of the sample (off of particles suspended in it) is measured; the intensity of this scattered light is considered to be related to the amount of suspended solids in the sample." ([reference](/wiki/turbidity_sensing))
_image credit: https://castlebrookestreamstudy.weebly.com/_
This page needs help!
* Info about regulations
* Info about ecological or human health impacts
* Advocacy leverage points
* Constraints we're working within: cost, complexity, sensitivity, time
There are a LOT of resources available on these pages by @donblair and others:
Here's a list of different turbidity sensors and measurement systems. See below for some Do-It-Yourself approaches to measuring turbidity, and [this page](https://publiclab.org/wiki/turbidity_sensing) for more information on how turbidity sensors works.
* Kelley et al., An Affordable Open Source Turbidimeter http://www.mdpi.com/1424-8220/14/4/7142/pdf
* Hackteria.org, Turbiduino: http://hackteria.org/wiki/DIY_turbidity_meters
* Lambrou et al., A Nephelometric Turbidity System for
Monitoring Residential Drinking Water Quality: http://www2.ucy.ac.cy/~faniseng/publications/SENSAPPEAL09.pdf
- Fondriest review: http://www.fondriest.com/environmental-measurements/equipment/measuring-water-quality/turbidity-sensors-meters-and-methods/
- Hach overview: http://www.hach.com/asset-get.download-en.jsa?code=61798
<iframe src="https://docs.google.com/spreadsheets/d/e/2PACX-1vSc9ZCBfiTnvYinkSJSjyk0kuf4D3jma1FnwAyzQQCocynuqYNB5DXJlcKtRYEfCPLY-J_T5Ods3tYZ/pubhtml?gid=28737041&single=true&widget=true&headers=false" style="border:none;width:100%;height:300px;"></iframe>
(see [Water sensors](https://publiclab.org/wiki/water-sensors) for more, and [click here to add to this table](https://docs.google.com/spreadsheets/d/1UwjRqU8kHTwEcnDdO2Zxkr8zkFkaGfyePJ-cdnxJzw0/edit#gid=28737041))
Activities for people to test methods (these develop over time)
## Existing work