Project Details
For Science Hack Day 2014, our team created a low-cost groundwater detection is necessary to measure groundwater usage on a wide scale.
The following is from the presentation given at Science Hack Day.
Things that you need
- wires
- electrodes
- power source
- voltmeter
To Measure Resistivity
Math!
![Groundwater spacing](/_astro/groundwater-spaced.mkHUTNDv_2uLOs3.webp)
Space electrodes evenly
![Groundwater outer distance](/_astro/groundwater-outer.mj76yQPB_ZMT8jY.webp)
Inject current in OUTER pair
![Groundwater inner distance](/_astro/groundwater-inner.B9Tgx1oy_ZJXmJp.webp)
Measure voltage across INNER pair
![Groundwater depth](/_astro/groundwater-depth.DQvEKaI6_28zGPg.webp)
Depth:
z = a / 2
![Groundwater resistivity](/_astro/groundwater-resistivity.CRYk3qdx_Z28n1Cg.webp)
Resistivity:
ρ = 2 π a V/I
ρ low = WATER!
ρ high = DRY!
![Groundwater distance to depth](/_astro/groundwater-distance.DleR9tjv_Z25wF1.webp)
As distance a
increases, the depth of signal increases
Recap
![Groundwater prototype](/_astro/groundwater-goal.CqcqPDi3_ZgGkak.webp)
- Low-cost groundwater detection is necessary to measure groundwater usage on a wide scale!
- The Arduino was chosen to use for data logging purposes
Collaborators
- Mika McKinnon
- Alice Pevyhouse
- Anita Hart
- Jeremy Wong
- with extra help from Christoph, Matthew, Brian, Chris and others