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Abstract
A series of slug tests were performed at groundwater monitoring wells in upper Gordon Gulch. The spefic wells tested were GGU_GW1, GGU_GW2, GGU_GW3, GGU_GW4, GGU_GW5, and GGU_GW6. Slug tests were perfomed by Steven Henning, a master's candidate at CU Boulder. Tests were performed on 8/6-7/2015 and 9/12-13/015. The tests were perfomed to determine the hydraulic conductivity of the aquifer material around the monitoring wells.
Subject Keywords
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Content
ReadMe.md
BCCZO -- Well Water Levels -- GGU_Slug_Test -- Gordon Gulch Upper -- (2016)
OVERVIEW
Description/Abstract
A series of slug tests were performed at groundwater monitoring wells in upper Gordon Gulch. The spefic wells tested were GGU_GW1, GGU_GW2, GGU_GW3, GGU_GW4, GGU_GW5, and GGU_GW6. Slug tests were perfomed by Steven Henning, a master's candidate at CU Boulder. Tests were performed on 8/6-7/2015 and 9/12-13/015. The tests were perfomed to determine the hydraulic conductivity of the aquifer material around the monitoring wells.
Creator/Author
Steven Henning
CZOs
Boulder
Contact
Steven Henning (steven.henning@colorado.edu)
Subtitle
GGU_GW_1, GGU_GW_2, GGU_GW_6
SUBJECTS
Disciplines
Hydrology
Topics
Well Water Levels
Subtopic
GGU_Slug_Test
Keywords
None
Variables
None
Variables ODM2
Groundwater Depth
TEMPORAL
Date Start
2016-01-01
Date End
2016-01-02
SPATIAL
Field Areas
Gordon Gulch
Location
Gordon Gulch Upper
North latitude
40.020990999999995
South latitude
40.018815999999994
West longitude
-105.476828
East longitude
-105.476603
REFERENCE
CZO ID
6541
COMMENTS
Comments
Slug testes were performed fl]ollowing ASTM D4041 and ASTM D4044 standards. Materials used include 3 weighted slugs of various volumes, electric tape, an In-Situ Level Troll 700 pressure transducer, and An In-Situ RuggerReader field computer.
To initate a falling head slug test, depth to water in each well was first checked with an electric tape. Then the pressure transducer was lowered into the well to a depth below the estimated elevation of the bottom of the slug that was to be dropped. Then the depth to water was remeasured witht the electric tape and entered into the RuggedReader to calibrate the depth to water with the transducer. After calibrating the pressure transducer, active logging of the depth to water was started to get a steady baseline recorded. After approximately 30 seconds of background recording, the slug was rapidly lowered intothe well to create an instantaneous rise in water level and head within the well. Initial displacement was noted and the water level was allowed to begin recovering. After the change in head had be reduced to 10% of the inital change, the test and water level recoding was stopped. This process is repeated for a rising head test, with the exception of the slug being rapidly withdrawn from the well rather than being lowered into it. In some cases the testing of the well was stopped before the water level recoved to within 10% of its starting value to to time constraints or inclement weather.
The data gathered from the pressure transducers has not been edited, but at least 2 of the 26 tests performed (Well4, Falling Test 2; Well6, Rising Test 3) show instrument error that should be accounted for in some way before using the data.
Additional Metadata
Name | Value |
---|---|
czos | Boulder |
czo_id | 6541 |
comments | Slug testes were performed fl]ollowing ASTM D4041 and ASTM D4044 standards. Materials used include 3 weighted slugs of various volumes, electric tape, an In-Situ Level Troll 700 pressure transducer, and An In-Situ RuggerReader field computer. To initate a falling head slug test, depth to water in each well was first checked with an electric tape. Then the pressure transducer was lowered into the well to a depth below the estimated elevation of the bottom of the slug that was to be dropped. Then the depth to water was remeasured witht the electric tape and entered into the RuggedReader to calibrate the depth to water with the transducer. After calibrating the pressure transducer, active logging of the depth to water was started to get a steady baseline recorded. After approximately 30 seconds of background recording, the slug was rapidly lowered intothe well to create an instantaneous rise in water level and head within the well. Initial displacement was noted and the water level was allowed to begin recovering. After the change in head had be reduced to 10% of the inital change, the test and water level recoding was stopped. This process is repeated for a rising head test, with the exception of the slug being rapidly withdrawn from the well rather than being lowered into it. In some cases the testing of the well was stopped before the water level recoved to within 10% of its starting value to to time constraints or inclement weather. The data gathered from the pressure transducers has not been edited, but at least 2 of the 26 tests performed (Well4, Falling Test 2; Well6, Rising Test 3) show instrument error that should be accounted for in some way before using the data. |
subtitle | GGU_GW_1, GGU_GW_2, GGU_GW_6 |
variables | |
disciplines | Hydrology |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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