Answers are grounded in this paper and cite their sources.
The level of underground freshwater plays a key role in human activities, in particular in agriculture. Monitoring the level of phreatic aquifers is very important to protect and to preserve this resource. We present a smart, ultra-low power (in the order of mJ), cheap and energy neutral system capable to monitor periodically and remotely the level of phreatic aquifers. The power supply is given by a single terrestrial Microbial Fuel Cell (MFC) and the measurements are carried out by means of a low cost capacitive phreatimeter and can be sent from km away through a long range radio. The overall power consumption is kept low, and power losses are mitigated thank to transient computing paradigm.
No takes yet. Share an insight, caveat, or question.
Sartori et al. (2016) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: