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 097
is completed to a depth of 6.1 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 2.6 m below ground level in July
1999, to a low of greater than 6.1 m below ground level in May 1996. The difference
between maximum and minimum ground water levels in any single year ranges from
approximately 0.6 to 2.6 metres. This observation well follows a regular pattern
of ground water recharge from irrigation waters. The hydrograph shows a steady-state
increase of ground water at the start of the irrigation season, peaking at
maximum levels in September and October, and declining as irrigation recharge
ceases. Minimum ground water levels occur in the months of April and May. Interference
due to pumping of nearby well(s) was evident between 1994 to 1996.
NOTE* Detailed water level information
for this well is available in Excel Format.
For more information, please email Carl
Lee (Carl.Lee@gov.bc.ca)