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Report: Hydrogeological Assessment of the Belcarra Aquifer, British Columbia

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The main purpose of this assessment is to develop a conceptual model of the Belcarra Aquifer located within the Greater Vancouver Regional District. The research described in this report constitutes a preliminary assessment of the Belcarra Aquifer. Specific objectives include: the delineation of the aquifer; interpretation of the chemical composition of the groundwater and to determine catchment areas and recharge rates. Village of Belcarra, 80 pp., NTS Map 092G06

Author:  Holt, M.; Allen, Diana; Department of Earth Sciences Simon Fraser University

Date Published:  Feb 2005

Report ID:  16767

Audience:  Government and Public

The Village of Belcarra is remotely located within the GVRD making importing of municipal water cost prohibitive. The majority of residents obtain their domestic water supply from wells drilled into the Belcarra Aquifer and limited surface water sources. The main purpose of this study was to develop a conceptual model of the Belcarra Aquifer. The geology of the Belcarra region, based on geological maps and drilled well records, consists of fractured granitic bedrock overlain by glacial sediments and topsoil. Groundwater generally recharges at elevations above 30-60 m, and discharges at lower elevations. Overall, the groundwater can be generally classified as a bicarbonate-chloride-sulfate type water based on anions, and a calcium-magnesium to sodium-calcium type water based on cations. Climate data (precipitation) were described using the Cumulative Precipitation Departure method to illustrate that recharge is direct from precipitation. Two methods were used to estimate recharge to the aquifer. The observation well data were analyzed using the Hydrograph method a water balance program called HELOP provided another estimate of recharge. In consideration of both methods, the most representative range of recharge estimate is 114 mm/yr. This value is based in the hydrograph method using a porosity of 0.01. Higher recharge may occur in areas that are more intensely fractured. With an annual precipitation of 2331 mm/yr, this estimate corresponds to a minimum of 4.8% of annual precipitation that is recharging the aquifer.

Report Type
  Region - Lower Mainland
  Water Information - Groundwater
  Water Information - Hydrometric / Hydrology
  Water Information - Water Management
  Water Information - Water Quality
  Water Information - Water Supply

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