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 %|
The hydrograph above shows the change in ground water level in the observation well (m below ground level) over time.
Observation well 096
is completed to a depth of 10.7 m, in the Osoyoos West (0193) aquifer, a sand
and gravel aquifer. The aquifer is classified as a IIA(16) aquifer, which
is a moderately developed, highly vulnerable aquifer. Since 1969, the ground water
level in the well has ranged from a high of 2.4 m below ground level in October
1974, to a low of 5.1 m below ground level in April 1993. Maximum ground water
levels occur in the months of September and October, and likely reflect both
recharge from seasonal precipitation and irrigation return flow. Minimum ground water
levels occur in the months of April and May. The difference between maximum
and minimum ground water levels in one season ranges from approximately 1.2
to 2.0 metres.