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The Vancouver Island Water Resources Vulnerability Mapping Project (VMP) was initiated in 2006 by the Vancouver Island Watershed Protection Steering Committee, with a goal of improving land-use decision-making tools concerning the preservation of groundwater quality. It was determined that intrinsic vulnerability maps would be developed to characterize the vulnerability of aquifers to contamination.
https://a100.gov.bc.ca/pub/acat/public/viewReport.do?reportId=19414
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Author: Newton, P. and A. Gilchrist
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Date Published: Apr 2010
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Report ID: 19413
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Audience: Government and Public
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The Vancouver Island Water Resources Vulnerability Mapping Project (VMP) was initiated in 2006 by the Vancouver Island Watershed Protection Steering Committee, with a goal of improving land-use decision-making tools concerning the preservation of groundwater quality. The VMP is a collaborative project between the BC Ministry of Environment, Vancouver Island University, Natural Resources Canada, and the Vancouver Island Health Authority. It was determined that intrinsic vulnerability maps would be developed to characterize the vulnerability of aquifers to contamination. Effective tools for decision-makers, these vulnerability maps identify where aquifers are vulnerable to contamination from various high risk land use activities.
The DRASTIC methodology developed by the U.S. Environmental Protection Agency was used in the pilot study to complete intrinsic groundwater vulnerability mapping for two of the seven regional districts on Vancouver Island: Nanaimo (RDN) and Cowichan Valley (CVRD).
The pilot study was completed in 2009, and work began on phase 2 of the VMP with two primary objectives. The study area was expanded to derive intrinsic vulnerability maps for all regional districts of Vancouver Island, and many of the manual processes used to complete the pilot study analysis were automated.
Results of the phase 2 intrinsic vulnerability analysis indicate that surficial aquifers represent moderate to high intrinsic vulnerability due to the lack of consistent confining layers and the resulting increased permeability of the vadose zone, in addition to higher aquifer media and hydraulic conductivity ratings, and the relatively shallow depth to water. Bedrock aquifers generally have low intrinsic vulnerability, due to their low aquifer media, vadose zone and hydraulic conductivity ratings, and their greater depth to water.
This document details the methodology used to produce intrinsic vulnerability mapping for all regional districts of Vancouver Island. However, because the phase 2 analysis was largely based on methods used to complete the pilot study, this document focuses on the differences used to complete the phase 2 assessment. It should be used in conjunction with the pilot study report (Liggett and Gilchrist, 2010), to update the vulnerability maps in the future.
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Report Type
Subject
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Region - Vancouver Island |
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Water Information - Groundwater |
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Water Information - Water Management |
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Water Information - Water Supply |
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