Type of Submission
Poster
Keywords
Recovery, well, geology
Abstract
This study was conducted to ascertain the relationship between geology and recovery rates of three selected Cedarville University water supply wells. In order to determine the recovery rates, the three selected wells were individually pumped down and then water level measurements were taken as the water levels rose in the well bore. The collected field data was analyzed and compared to the drillers’ well logs from when the wells were originally drilled. The geologic conditions that were examined for the area immediately surrounding the wells included: bedrock lithology, glacial drift characteristics (type and thickness), ground-surface topography, and bedrock topography. The goal was to be able to interpret how these variations in conditions affect well recovery. Recovery tests were performed on wells #9, #10, and #11 in the East Well Field. The three wells were chosen based on three criteria: accessibility, lithologies penetrated, similarities in casing and pump size, and completeness of well records. Field work consisted of pumping down each well and allowing them to recover to their pre-pumped level. The recorded information consisted of drawdown pumping rate, date, time, water level readings during recovery, and elapsed time between readings during recovery. The water level measurements were made using an electronic water-level measuring device. Specifically, a Solinst Water Level Meter Model 102 with 200ft of cable was used. Before the pump-down phase began, the static water level was measured. Recovery readings were taken at predetermined intervals which were increased as water levels rose. The testing of each well was terminated after recovery achieved 95% of the pre-pumped static water-level for the well. Average rates of recovery were calculated. The rates were 0.97 ft/min for Well #9, 1.22 ft/min for Well #10, and 1.20 ft/min for Well #11. The recovery curve and the lithologies for a particular well were plotted together in a well diagram. The diagrams for each of the three wells were examined and the analyses indicate that the wells with the least amount of glacial drift recovered the fastest. This included wells #10 and #11. Other geologic conditions were examined, but the most distinguishing condition was the amount of overburden.
Faculty Sponsor or Advisor’s Name
Dr. Whitmore
Campus Venue
Stevens Student Center
Location
Cedarville, OH
Start Date
4-1-2015 11:00 AM
End Date
4-1-2015 2:00 PM
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Relationship of Surrounding Geology to Well Recovery Properties for Selected Cedarville University Water Supply Wells
Cedarville, OH
This study was conducted to ascertain the relationship between geology and recovery rates of three selected Cedarville University water supply wells. In order to determine the recovery rates, the three selected wells were individually pumped down and then water level measurements were taken as the water levels rose in the well bore. The collected field data was analyzed and compared to the drillers’ well logs from when the wells were originally drilled. The geologic conditions that were examined for the area immediately surrounding the wells included: bedrock lithology, glacial drift characteristics (type and thickness), ground-surface topography, and bedrock topography. The goal was to be able to interpret how these variations in conditions affect well recovery. Recovery tests were performed on wells #9, #10, and #11 in the East Well Field. The three wells were chosen based on three criteria: accessibility, lithologies penetrated, similarities in casing and pump size, and completeness of well records. Field work consisted of pumping down each well and allowing them to recover to their pre-pumped level. The recorded information consisted of drawdown pumping rate, date, time, water level readings during recovery, and elapsed time between readings during recovery. The water level measurements were made using an electronic water-level measuring device. Specifically, a Solinst Water Level Meter Model 102 with 200ft of cable was used. Before the pump-down phase began, the static water level was measured. Recovery readings were taken at predetermined intervals which were increased as water levels rose. The testing of each well was terminated after recovery achieved 95% of the pre-pumped static water-level for the well. Average rates of recovery were calculated. The rates were 0.97 ft/min for Well #9, 1.22 ft/min for Well #10, and 1.20 ft/min for Well #11. The recovery curve and the lithologies for a particular well were plotted together in a well diagram. The diagrams for each of the three wells were examined and the analyses indicate that the wells with the least amount of glacial drift recovered the fastest. This included wells #10 and #11. Other geologic conditions were examined, but the most distinguishing condition was the amount of overburden.
