Ground Water Elevation

Updated by Travis Bates

Calculate groundwater elevation from HYDROS 21 / CTD sensor depth measurements

Civil and Geotechnical experts often monitor groundwater elevation. The elevation is calculated by subtracting the sensor installation depth from the well elevation and then adding the sensor measured head. The Top of Casing (TOC) is typically used as the well elevation reference point.

Groundwater Elevation = (Well Elevation - Install Depth) + Head

  • Well Elevation is typically the TOC elevation from sea level.
  • Install Depth is the sensor installation depth from a point of reference, typically a wellhead.
  • Head is the sensor measured water level

Formula: H = (z_well - d_sen) + h_pt

  • H = elevation of groundwater
  • z_well = elevation of the well
  • d_sen = sensor installation depth
  • h_pt = head or sensor measured water level

METER Sensors needed for calculating Ground Water Elevation:

Click the Science Beaker icon to create new environmental models.

Select the Ground Water Elevation environmental model from the drop-down.

Enter a name for the model, and a name for the chart.

Select a device.

There are two input fields Installation Depth and Well Elevation. The sensor depth field will auto-fill from the Measurement Configuration page if a value is present, otherwise, the field will be blank. If blank enter the appropriate value.

Click Create to save the chart.

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