2. Hydrogeological Conceptual Model

A hydrogeological conceptual model is a visual representation of how water moves over and through the earth.


The model helps us explain how water moves through cracks and fractures in a sandstone aquifer.

When rain falls on the ground, some of it travels slowly down through the ground to the aquifer.

  • As water makes its slow journey, it is filtered by soil, sand and gravel. This water is called groundwater.
  • Some of the rainwater runs over the land into lakes, rivers, and streams. This water is called surface water.

The model is based on measurements and observations, and what is currently known about groundwater processes.

The model helps us to better understand the potential flow pathways and storage properties of the aquifers, the amount of groundwater involved, and how these quantities relate to water demand in the RDN’s six water regions on Vancouver Island.

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How the Model Was Developed:

2.1 ARC-GIS Geodatabase Development
2.2 Available Information and Concurrent Projects
2.3 Data Compilation
2.4 Conceptual Water Budget Model Development

2.4.1 The Water Cycle
2.4.2 Surface Water
2.4.3 Groundwater Aquifers
2.4.4 Regional Geology

2.5 Surface Water Assessment and Water Budgets

2.5.1 Regional Hydrological Model
2.5.2 Surface Water Budgets and Stress Analysis

2.6 Groundwater Assessment and Aquifer Water Budgets

2.6.1 Approach Used For Water Budget Calculations
2.6.2 Aquifer Stress Assessment – Relative Ranking
2.6.3 Climate Variability Indicator and Implications for Aquifer Recharge

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