Water intermittency data logger

Hello,

I am trying to find a simple cheap data logger that can record simply the presence or absence of water for stream intermittency surveys. The best resource I've found is a way to reverse hack a HOBO Pendant - however the resource does not have information detailed enough for me to do this myself. https://www.onsetcomp.com/files/Chapin-STIC-WRR-2014-reprint.pdf

Does anyone know of a CircuitHub style DIY design or an pre-made affordable product? If not, I'll reach out to the authors of the above report. If anyone is interested in what I hear from them I will share it. 

All the best,

Erick

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