Airborne Electromagnetic (AEM) Survey
AEM survey is a very rapid and efficient way of remotely sensing geology across an entire area without engaging in extensive drilling. In AEM surveys, a geophysical device, typically bullet or hoop-shaped, which contains sensors is suspended beneath an aircraft, typically a helicopter to collect geophysical data using electromagnetics. The Eastern Nebraska Water Resources Assessment (ENWRA) and University of Nebraska Conservation and Survey Division (UNL CSD) are partners in the planning, conducting, and capturing data for the AEM surveys.
Understanding the hydrogeologic framework of Lewis & Clark NRD is important due to a highly diverse geologic makeup of the region as a result of how geologic material was laid down. Development of the hydrogeologic framework provides staff and directors the ability to better comprehend and therefore better manage the groundwater resources of the district.
This survey covered the Bazile Groundwater Management Area (BGMA) as well as the Creighton Water System and West Knox Rural Water System.
This survey covered the parts of the southern portion of Cedar & Knox Counties.
Planned Lewis & Clark NRD 2018 AEM Survey
To be completed during the summer of 2018 with data available in mid to late 2019 will include a 3 mile grid of norther Cedar and Knox county and focused surveys in areas of interest where little is known about aquifer extent and connection to the surface.
Equipment used in conduction AEM surveys
Preparing the hoop shaped geophysical device for surveying.
A hoop shaped geophysical device which contains sensors is suspended beneath a helicopter used to conduct surveys.
Jim Cannia of Aqua Geo Frameworks explains data collected from an AEM survey.