_Main image above is by Suzanne McDaniel, and was taken at Island End River in Chelsea, MA, part of the Mystic River watershed. Suzanne's photo was one of the winners of the [MyRWA photo contest](http://mysticriver.org/photo-contest/)._ ## The Open Water Project The Open Water Project aims to - develop and curate open hardware and open software useful for water-related applications - build and facilitate data infrastructures that allow for easier sharing of water data - encourage the growth of communities focused on 'free and open' approaches to water science - support ongoing work by grassroots communities interested in their own local water quality issues To this end, we've been focusing on several initiatives, in particular: **The RIFFLE: An Open Source Datalogger.** We are working to develop an open source hardware datalogger that can be placed in the field for extended deployments and measure common water parameters like: - temperature - conductivity - depth - turbidity The main Public lab wiki for this device is [here](http://publiclab.org/wiki/riffle). For recent research and descriptions of projects, you can search for 'riffle' on Public Lab, via [this link](http://publiclab.org/search/riffle). **The Coqui: using audio as a sensor data format.** We're also exploring using audio frequencies to convey sensor readings -- like a modem, but even simpler -- in order to make sensor readings more accessible for people (or to enable data transmission over ubiquitous audio jacks on PCs and smartphones). Read more about this idea on the [Coqui wiki](http://publiclab.org/wiki/coqui), or look for recent updates on Public Lab [here](http://publiclab.org/search/coqui). **A mailing list.** Sign up for the [plots-water-quality email list](https://groups.google.com/forum/#!forum/plots-waterquality), and participate in discussions about low-cost, open source water quality monitoring tools and techniques. [](https://i.publiclab.org/system/images/photos/000/012/225/original/riffleStraightUp.png) [](https://i.publiclab.org/system/images/photos/000/012/226/original/Riffle-ito.png) [](//i.publiclab.org/system/images/photos/000/014/362/original/riffleLabel2.png) ##Fracking and Water Quality + Runoff There are also unique water issues related to frac sand. To get some background information and to explore options for addressing water issues as they relate to frac sand mining in your community, [head on over to the frac sand wiki page](https://publiclab.org/wiki/frac-sand). ## Community Projects We'd also like to use this wiki as a place to post links to other projects that embody an 'open science / open source' approach to hydrology and water technologies. Please add your links below! - InfoAmazonia Network: http://publiclab.org/wiki/infoamazonia-network...
| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "Hi, I reposted this from https://publiclab.org/wiki/coqui-a-simple-water-conductivity-sensor -- to make it into an activity that can be featured in..." | Read more » | over 8 years ago | |||
| pdhixenbaugh | "Re: square wave, I feel really out of my comfort zone here, but that's ok :). I know to make a square wave voltage source, you have to add up sine ..." | Read more » | almost 9 years ago | |||
| pdhixenbaugh | "I'll do what I can :D it might be good weekend reading. So take everything that follows from the perspective of me not knowing much about measuring..." | Read more » | almost 9 years ago | |||
| donblair | "I need a little help understanding this background. When you modulate the LED at 1 kHz, that means it's flashing on and off 1000 times a second? E..." | Read more » | almost 9 years ago | |||
| donblair | "@pdhixenbaugh -- These are great ideas / questions / suggestions! I just posted a quick follow-up here: https://publiclab.org/notes/donblair/03-2..." | Read more » | almost 9 years ago | |||
| pdhixenbaugh | "I need a little help understanding this background. When you modulate the LED at 1 kHz, that means it's flashing on and off 1000 times a second? Ho..." | Read more » | almost 9 years ago | |||
| mathew | "Cool! I ordered some of those PEX connectors to try out! We've been discussing a variety of connectors. check out these recent developments: http..." | Read more » | almost 9 years ago | |||
| EdMallon | "Just a quick suggestion: I've been using pex swivel adapters in my underwater connectors: http://www.menards.com/main/plumbing/rough-plumbing/pip..." | Read more » | almost 9 years ago | |||
| liz | "Wow this is so well-written! Thanks for making these concepts accessible. " | Read more » | almost 9 years ago | |||
| mathew | "I wish I had brands to list, but yes, we've seen commercial probes using small (0-80) screws as their probes. " | Read more » | almost 9 years ago | |||
| pdhixenbaugh | "What will be the long term corrosive effects of current and salt water on our stainless steel screws? I think we've seen stainless steel probes on ..." | Read more » | almost 9 years ago | |||
| warren | "large yogurt container Love this idea for standardization; used yogurt containers pile up quickly in my house. Or a mason jar! I'd guess material ..." | Read more » | about 9 years ago | |||
| donblair | "Hah, just saw that @mathew posted a link I was reading this morning, but forgot to include: http://www.electroschematics.com/6923/555-low-voltage-..." | Read more » | about 9 years ago | |||
| semitones | "This is really cool! I just found this project in an attempt to see what open source projects exist for water quality monitoring for my new interns..." | Read more » | about 9 years ago | |||
| mathew | "I was worried about those o-rings... the silicone, while durable, is flexible and doesn't stick down well. Next option is to try poking through a..." | Read more » | about 9 years ago | |||
| donblair | "Yes -- at this point it might very well be possible to do temp, conductivity, and turbidity while only needing to put screws through the cap, and t..." | Read more » | about 9 years ago | |||
| mathew | "also, right now this is, like my earlier stopper example, a sealant strategy without sensors to go with it. @Donblair has stuck to his guns on scr..." | Read more » | about 9 years ago | |||
| tonyc | "I'm not seeing any bulk sources that get us a price break over the price on amazon, so I don't really see a reason we should carry it over just lin..." | Read more » | about 9 years ago | |||
| warren | "Love it! Maybe we should offer these parts in the store for early experimenters? Just the stopper and some sealant? 2.8oz tubes are for <$4 on a..." | Read more » | about 9 years ago | |||
| patcoyle | "Nice results, real example – 8 weeks is non trivial. " | Read more » | about 9 years ago | |||
| gretchengehrke | "Would it be useful for these folks to have balloon or kite mapping kits to take aerial photos of mine operations and expansions? " | Read more » | about 9 years ago | |||
| warren | "Wow, this is great to hear. Is Juan Camilo Cardenas on the laboratoriopublico list or interested in being in touch with the south american & sp..." | Read more » | about 9 years ago | |||
| DavidMack | "@gpenzo the 2 ft. of chain would serve as the counter weight, then the chain would connect to a rope which is connected to an anchor. the foam dis..." | Read more » | over 9 years ago | |||
| gpenzo | "I presume you will use a chain to connect this to a weight. Does this design have enough buoyancy to carry the chain wieght? The PVC design looks g..." | Read more » | over 9 years ago |