Rivers, oceans, lakes, aquifers, groundwater, stormwater, urban canals, underground streams, estuaries, and more -- we are passionate about water quality! This page will help you find resources to explore the waterbodies you care about, and connect with other people who have the same interests: ### Questions on Water Quality: [questions:water-quality] **** ## Monitoring * [Water sampling](/water-sampling) * [Water sensors](/water-sensors) * Posts on #water-monitoring * Posts on #water-testing * Posts on #reagents ## Water quality parameters Read about different water quality parameters here, including pH, nitrogen, conductivity, temperature, ORP and turbidity: * https://publiclab.org/common-water-contaminants Also see this overview of 7 ways to monitorn water quality: * https://publiclab.org/notes/anngneal/12-08-2017/7-ways-to-measure-monitor-and-evaluate-water-quality ## Groups and projects working on water quality issues: [wikis:project:water-quality] **** ## Water quality related pages [wikis:parent:water-quality] **** ## Activities [activities:water-quality]...
| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| cfastie | "The Public Lab desktop spectrometer is quite capable of making a spectral graph of sunlight reflected from grass. The curve will differ from the pr..." | Read more » | over 10 years ago | |||
| WhiteRabbit | "Here's a write-up that I'm finding quite helpful: http://publiclab.org/notes/nedhorning/11-01-2013/why-a-red-filter-should-work-well-for-ndvi Eyeb..." | Read more » | over 10 years ago | |||
| WhiteRabbit | "Sounds like gel filters would be tricky at best, so I guess ixnay to that. How about this one? http://www.ebay.com/itm/Optical-Interference-Filter..." | Read more » | over 10 years ago | |||
| cfastie | "I have not seen a cheap filter like Rosco that is truly a narrow band pass filter. It might be possible to combine filters to get a fairly narrow t..." | Read more » | over 10 years ago | |||
| WhiteRabbit | "Cool! Awesome post. I suppose it's wishful (and probably foolish) thinking, but given the the low price of a filter swatch book and the seemingly..." | Read more » | over 10 years ago | |||
| cfastie | "A filter switcher is a viable solution, especially for small cameras. Cameras as large as Powershots might require a big, precise device in front o..." | Read more » | over 10 years ago | |||
| WhiteRabbit | "Thanks, Chris, for your thoughtful and very informative post. If I'm reading it right, perhaps using two monochrome cameras, each with the appropr..." | Read more » | over 10 years ago | |||
| cfastie | "It should be possible to distinguish between stressed and non-stressed lawn grass using NDVI. I suspect that the $900 FieldScout performs more or l..." | Read more » | over 10 years ago | |||
| WhiteRabbit | "Interestingly enough, I did just now find this $889 turf grass color meter which does, indeed, use NDVI! http://www.specmeters.com/nutrient-manage..." | Read more » | over 10 years ago | |||
| WhiteRabbit | "Thanks for the links. Supposedly grass also changes color as the soil loses moisture (IIRC, it becomes less green and more blueish?), and people c..." | Read more » | over 10 years ago | |||
| warren | "I think a lot of the challenge of using an Infragram camera well is the need for comparison. Comparing an area treated in one way with a "control" ..." | Read more » | over 10 years ago | |||
| EdMallon | "Despite my zeal for the project, I have tried not to bomb everyone here with the many incremental updates as I go along. But I think I might have p..." | Read more » | over 10 years ago | |||
| zengirl2 | "Bummer, I'm scheduled for an artist's opening on Friday night at my nature center (same weekend as the barnraising). However, I could swear I saw ..." | Read more » | over 10 years ago | |||
| kanarinka | "No worries - if you can travel north a bit you should consider coming to the New England barnraising the weekend of June 5th -- http://publiclab.or..." | Read more » | over 10 years ago | |||
| zengirl2 | "I live in Philly. I'm currently a LandLab Artist in Residence at the Schuylkill Center for Environmental Education. I'm hoping to study stormwater..." | Read more » | over 10 years ago | |||
| kanarinka | "Thanks ZenGirl2 - a tutorial is definitely in the works as soon as we have a working prototype that people can use -- we are looking at June 5th fo..." | Read more » | over 10 years ago | |||
| zengirl2 | "I noticed that you have a lot of Github info, but are you considering writing a tutorial? I'm interested in building a Riffle for Philly. Maybe yo..." | Read more » | over 10 years ago | |||
| warren | "@wattminder - have you seen some of the recent work with the Riffle, for conductivity monitoring of water? http://publiclab.org/wiki/riffle Also f..." | Read more » | over 10 years ago | |||
| unmanaged | "Also I found out from a "expert" that for accurate readings, some of the drift might be based on the soil temps, you need to take soil temperature ..." | Read more » | over 10 years ago | |||
| donblair | "Update: check out our new conductivity results in this research note -- looks like corrosion was, indeed, the culprit (thanks, Mathew and umanaged,..." | Read more » | over 10 years ago | |||
| donblair | "Hi unmanaged -- it'd be great to have you as a beta tester! We're going to be ordering a new round of prototypes very soon, and we're hoping to ha..." | Read more » | over 10 years ago | |||
| unmanaged | "See the website for more info on SS rods... If you are in the US Airgas is all over... http://www.airgas.com/browse/product_list.aspx?catID=144&..." | Read more » | over 10 years ago | |||
| unmanaged | "I would love to beta test this... I am working on something like this... FYI go to your local welding shop and buy stainless steel welding rods... ..." | Read more » | over 10 years ago | |||
| donblair | "And, as per our discussion elsewhere today, maybe we also want this material to go in a 'wiki' ... if you get a chance, Catherine, maybe you can d..." | Read more » | over 10 years ago |