The Province operates a network of observation wells to provide data on ground water level fluctuations and ground water quality information on developed aquifers in British Columbia. Observation well water levels are monitored using one of four methods: 1) manually with a wetted tape, 2) continuously using Steven's chart recorders, 3) electronically with data loggers or 4) remote monitoring using cellphone technology.
Water level data from observation wells are collected on a monthly basis by field observers and forwarded to Regional Offices. Data are then checked for errors and ommissions and forwarded to the Water and Air Monitoring and Reporting Section for final checking and storage. Water level data are referenced from ground level and the month end water level reading are entered and stored in Excel to produce a month-end hydrograph. The method of measurement and accuracy of each method are given below:
|Method of measurement||Accuracy|
|Wetted Tape Method||+/- 1 mm|
|Steven's Chart Recorder||+/- 1 mm|
|Data Logger||+/- 0.1 %|
Hydrograph Analysis- Observation Well 080
The hydrograph above shows the change in ground water level in the observation well (m below ground level) over time.
Observation well 080 is completed in an unmapped, sand and gravel aquifer to a depth of 15.2 m. Since 1971, the ground water level in the well has ranged from a high of 3.9 m below ground level in August 1972, to a low of 5.1 m below ground level in October 2001. Maximum ground water levels occur in April and May, and minimum ground water levels occur in September, October and November.
This observation well
is located near an irrigation well. The pumping of the irrigation well produces
pumping interference on the observation well's recording. When the irrigation
well is not pumping, this observation well is able to monitor seasonal fluctuations.
The difference between maximum and minimum ground water levels in any single
year ranges from approximately 0.1 to 0.5 metres.