Metadata: Nanaimo Lowlands Aquifers Confinement Conditions

Metadata NAP : more info

Identification

Abstract

This dataset shows the confinement of the Nanaimo Lowland aquifer, British Columbia. The study area is from Nanoose Bay to Deep Bay, designating a low relief coastal strip along the southeastern part of Vancouver Island, BC. The confinement of the aquifer was determinate using the sediment thickness and type. The resulting map shows a large area of free and semi-confined conditions on the west of the Englishman River. There is also an area of confined conditions next to the Big Qualicum River.

Status:

completed

Title

Nanaimo Lowlands Aquifers Confinement Conditions

Date

2016-03-31 ( register

publication)

Date

2016-03-07 ( register

revision)

Edition

Edition date

Citation group

principalInvestigator

Name

Nicolas Benoît

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Quebec

Position

Information

Address	Delivery point : 490, rue de la Couronne, 3e étage 490, rue de la Couronne, 3e étage City : Québec Québec Administrative region : Québec Québec Postal code : Country : Canada Canada Email nicolas.benoit@canada.ca
Telephone	voice; 1 (418) 6543646
Online Resource

Citation group

originator

Name

Francesca Audet-Gagnon

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Quebec

Position

Information

Address	Delivery point : 490, rue de la Couronne, 3e étage 490, rue de la Couronne, 3e étage City : Québec Québec Administrative region : Québec Québec Postal code : Country : Canada Canada Email nrcan.gsc-geosciencedata-donneesgeoscience-cgc.rncan@canada.ca
Telephone
Online Resource

Citation group

custodian

Name

Francois Letourneau

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Quebec

Position

Information

Address	Delivery point : 490, rue de la Couronne, 3e étage 490, rue de la Couronne, 3e étage City : Québec Québec Administrative region : Québec Québec Postal code : Country : Canada Canada Email francois.letourneau@canada.ca
Telephone	voice; 1 (418) 6543826
Online Resource

Citation group

pointOfContact

Name

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada

Position

Information

Address	Delivery point : City : Administrative region : Postal code : Country : Email nrcan.gsc-geosciencedata-donneesgeoscience-cgc.rncan@canada.ca
Telephone
Online Resource

Presentation form

mapDigital

Goals

The confining conditions were created to provide a regional frame of the Quadra aquifer confinement within Nanaimo Lowland area.

Keyword(s)

Spatial representation	grid
Resolution
Language	eng; CAN
Language	fra; CAN
Character encoding	utf8
Thematic category	geoscientificInformation
Extent	-124.790600000,49.196682000;-124.108868000,49.465623000
Supplemental information

Distribution

Specific information related to data distribution

Format
Name	ASCII Grid
Version	unknown

Format
Name	WMS
Version	1.3.0

Format
Name	GIF
Version	unknown

Format
Name	HTML
Version	5

Format
Name	JPG
Version	unknown

Format
Name	TIFF
Version	unknown

Format
Name	TXT
Version	unknown

Format
Name	PNG
Version	unknown

Format
Name	ASCII GRID
Version	not applicable

Distributor

Contact

distributor

Name

Eric Boisvert

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Quebec

Position

Information

Address	Delivery point : 490, rue de la Couronne, 3e étage 490, rue de la Couronne, 3e étage City : Québec Québec Administrative region : Québec Québec Postal code : Country : Canada Canada Email eric.boisvert2@canada.ca
Telephone	voice; 1 (418) 6543705
Online Resource

Distributor

Contact

pointOfContact

Name

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada

Position

Information

Address	Delivery point : City : Administrative region : Postal code : Country : Email nrcan.gsc-geosciencedata-donneesgeoscience-cgc.rncan@canada.ca
Telephone
Online Resource

Transfer options

Quality

Quality description scope : register

dataset

Lineage

Message Date lineage
Lineage is the description of the sources and steps used to create the current dataset.

Introduction
Quadra aquifer confinement raster creation

Process step

Sources

To define the Quadra Sand Aquifer confinement, four hydrogeological unit's thickness raster were used: Capilano-Salish, Capilano, Vashon Coarse and Vashon Till ones. These units were used since they overly the Quadra Sand Aquifer. For each raster, the cell values were converted to an integer by truncation, using ""Int"" tool. Two fields were then added to the attribute table: ""Confi"" and ""Confinement"". The first field ""Confi"" designates the aquifer conditions: 1 for free aquifer condition; 2 for semi-confined conditions and 3 for confined conditions. Each condition is described below: • Free aquifer: gravel or/and sand; till with thickness < 3 m; • Semi-confined aquifer: till with thickness > 3 m; clay or/and silt with thickness < 5 m; • Confined aquifer: clay or/and silt with thickness ≥ 5 m. In the second field, ""Confinement"", the ""Confi"" value was multiplied by a weight defined on aquifer conditions: 1 for free aquifer condition; 5 for semi-confined aquifer and 10 for confined conditions. The ""lookup"" tool was then used to create a new raster by looking up values found in the confinement field in the table of the input raster. The ""lookup"" field was the confinement. The resulting raster had two fields: count and value, which designates the confinement value. The value field was then reclassified (using the reclassify tool), thus the NoData pixels were assigned a new value of ""0"". This procedure was applied for the four hydrogeological units. These latter were then summed, using the tool ""Raster Calculator"". The resulting raster exhibits the summed confinement of the four hydrogeological units (field Value). A field ""Confinement"" is created and the values are classified as follow: - Confined: value ≥ 30 - Semi-confined: value ˃ 10 et ˂ 30 - Unconfined: value ≤ 10

Benoit, N. and Paradis, D., 2015. Three dimensional groundwater flow model of the Nanoose-Deep Bay area, Nanaimo Lowland, British Columbia; Geological Survey of Canada, Open File 7845, 1 zip file. doi: 10.4095/297046

Technical details and constraints

File identifier	fd0b288e-8f2b-fb9f-58c2-09403d55dc65
Language	eng; CAN
Character encoding	utf8
Hierarchical classification	dataset
Date	2017-04-18
Metadata standard	North American Profile of ISO 19115:2003 - Geographic information - Metadata
Version	CAN/CGSB-171.100-2009
Constraints
Update frequency	asNeeded

Regionalisation

Metadata are available in those languages (You can use language menu item in the top menu bar to switch language):

Language code	Pays	Encodage
French	Canada	utf8

Geographic Reference System

Reference System code	EPSG:26910
Register	http://www.epsg-registry.org/
Version	6.14

Metadata Contact

author

Name

Francois Letourneau

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Quebec

Position

Information

Address	Delivery point : 490, rue de la Couronne, 3e étage 490, rue de la Couronne, 3e étage City : Québec Québec Administrative region : Québec Québec Postal code : Country : Canada Canada Email francois.letourneau@canada.ca
Telephone	voice; 1 (418) 6543826
Online Resource

pointOfContact

Name

Organisation

Government of Canada; Natural Resources Canada; Geological Survey of Canada

Position

Information

Address	Delivery point : City : Administrative region : Postal code : Country : Email nrcan.gsc-geosciencedata-donneesgeoscience-cgc.rncan@canada.ca
Telephone
Online Resource