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If you have any questions on the information presented, or require additional report data or attachments, please contact the Report Contact
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The Liard-Petitot project is designed to provide geological and hydrogeological data to aid in groundwater resource assessments in the Liard and Petitot sub-basins trans-boundary water management areas. The purpose of the project is to compile, synthesize and analyze groundwater related information from NTS map sheets 94I, 94J, 94O and 94P including surficial geology maps, water well records, geology, hydrology, current development activities and groundwater use.
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Author: Vic Levson, Heather Blyth, Tim Johnsen, Mike Fournier
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Date Published: May 2018
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Report ID: 54471
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Audience: Government and Public
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he Liard-Petitot project is designed to provide geological and hydrogeological data to aid in groundwater resource assessments in the Liard and Petitot sub-basins trans-boundary water management areas. The purpose of the project is to compile, synthesize and analyze groundwater related information from NTS map sheets 94I, 94J, 94O and 94P including surficial geology maps, water well records, geology, hydrology, current development activities and groundwater use. All map data including surficial and bedrock geology maps, terrain and soils maps, vegetation resource inventory and predictive ecosystem maps were acquired in digital format and incorporated into the GIS database (>35 Gigabytes). Other relevant literature and data were compiled and reviewed including: water well data, oil and gas exploration well data, geophysical data and surface land use data. All of the surficial geology map data were compiled into a single data set for the region and the main aquifer units were characterized in as much detail as possible. A total of 6418 aquifers were mapped comprising almost 3 billion square metres (292,178 ha) but only 5.7% of the entire study region (5,121,701 ha; 51,217 km2).
The approach used a fact-based or reality-based methodology rather than a theoretical or hypothetical modelled approach. The primary premise has been to use tested and verifiable data based on high quality factual information wherever possible. As such, a strong geological basis has been applied to the analysis using data sets that have been produced by highly qualified experts at detailed scales and field tested and verified with ground surveys.
Aquifers mapped using surficial geology data in the area consist of alluvial (mainly fluvial) aquifers, where the potential for hydraulic connectivity with a river is high, and upland (mainly glaciofluvial) aquifers that may or may not be hydraulically connected to modern streams and rivers. Alluvial aquifers comprise 57.3% of all mapped aquifers and upland aquifers comprise 42.7%. Sub-surface aquifers are classified as either confined glacial, pre-glacial aquifers or confined, fractured sedimentary bedrock aquifers. A total of only 208 water-well records were obtained for the area; 27% (56 wells) are in surficial aquifers and 33% are in bedrock aquifers (68 wells). The aquifer type is unknown for 32% (66 wells) and 9% were dry (18 wells).
To determine priority areas for future study, two land use indices were generated, and then combined to make a third. First, general land surface impacts were quantified by considering data on the area of land use impact, land use type and general surficial hydrogeology type. This index is mainly a proxy of land use impacts on groundwater quality. Secondly, an index of water well density was generated by considering the density of wells. This index is a proxy for land use impacts on groundwater quantity. Finally, the two indices were normalized and combined to create a total index of land disturbance and well density, and then ranked for each of 28 drainage basins in the study area.
The top ranked (high priority) basins as a proportion of the entire basin area are the Lower Prophet (1), Middle Fort Nelson (2), Lower Muskwa (3), Lower Fort Nelson (4), Lower Liard (5) and Upper Muskwa (6) river basins. As a proportion of only aquifer area, they are the Lower Fort Nelson (1), Middle Fort Nelson (2), Lower Muskwa (3), Lower Prophet (4), Upper Fort Nelson (5) and Lower Liard (6) river basins.
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Report Type
Subject
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Region - Peace |
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Water Information - Groundwater |
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Water Information - Hydrometric / Hydrology |
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