Observation Well Information

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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 %

observation well 77 Keremeos

Hydrograph Analysis- Observation Well 077

The hydrograph above shows the change in ground water level in the observation well (m below ground level) over time. This observation well is monitored by monthly, manual wetted tape recordings.

Observation well 077 is completed to a depth of 34.1 m in aquifer 0259, an unconfined, sand and gravel aquifer. The aquifer is classified as an IIA (14) aquifer - moderately used and highly vulnerable to contamination from land surface. Since 1971, the ground water level in the well has ranged from a high of 20.5 m below ground level in July 1972, to a low of 23.57 m below ground level in August 2001. The hydrograph shows that ground water levels follow a regular pattern, with maximum ground water levels occurring in May and June, possibly due to annual snowmelt, and minimum ground water levels occurring during the September and October months. The difference between maximum and minimum ground water levels in one season ranges from approximately 0.3 to 2.0 metres. A major data gap exists in the recording period from June 1978 to May 1989, obscuring possible trends within this period.


NOTE* Detailed water level information for this well is available in Excel Format.
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