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 069
The hydrograph above shows the change in ground water level in the observation well (m below ground level) over time.
Observation well 069 is completed in an unmapped, bedrock aquifer to a depth of 166.7 m. Since 1975, the ground water level in the well has ranged from a high of 5.2 m below ground level in May 1998, to a low of 7.0 m below ground level in August 1994. The hydrograph shows that ground water levels followed a regular seasonal pattern. Maximum ground water levels occurred yearly during March and April, corresponding to ground water recharge from seasonal precipitation, and minimum ground water levels occurred in September, October and November. The difference between maximum and minimum ground water levels in any single year ranges from approximately 0.5 to 1.5 metres.
water levels in this well may have also fluctuated in response to ocean tides
(not visible in hydrograph). This observation well was abandoned in 1998.