WTR B

Water Cycle Overview

  • Grant MacEwan emphasizes the importance and majesty of water, symbolizing its essential role in life for everyone, regardless of status.

Historical Figures in Hydrology

  • Sir Edmond Halley (1656 - 1742): Researched the relationship between precipitation and river supplies.

  • Claude Perrault (1613 - 1688): Collaborated on early hydrological calculations.

Components of the Water Cycle

  • Major processes in the hydrologic cycle include:

    • Evaporation: Converts liquid water into vapor.

    • Condensation: Transformation of water vapor back into liquid, forming clouds.

    • Precipitation: Rain, snow, and other forms of water falling to the Earth's surface.

    • Transpiration: Release of water vapor from plants into the atmosphere.

    • Infiltration: Movement of water into the ground, affecting groundwater recharge.

    • Surface Runoff: Water flowing over land into bodies of water.

Water Storage

  • Types of water storage include:

    • Ice and Snow Storage: Large reservoirs of freshwater that release water as they melt.

    • Atmospheric Storage: Water vapor in the air participates in different cycles.

    • Freshwater Storage: Groundwater and surface reservoirs that supply ecosystems and humans.

Infiltration Dynamics

  • Infiltration affects water movement into the ground, crucial for irrigation planning and assessing environmental impacts.

  • Equipment like the double-ring infiltrometer measures infiltration rates, indicating overland flow and potential pollution risk.

Groundwater Characteristics

  • Zone of Saturation: Area below the water table where all the spaces are filled with water.

  • Fossil Water: Groundwater that takes a long time to recharge, considered non-renewable.

Importance of Ice and Snow

  • Cryosphere Significance: Role of glaciers and ice in water storage and climate regulation.

  • Global Warming Impact: Warming trends can drastically affect the hydrologic cycle, as noted by the Intergovernmental Panel on Climate Change (IPCC).

Global Water Issues

  • Dams' Role: Dams serve to increase water availability but also bring ecological challenges.

  • Water Conflicts: Rising water demand leads to conflicts over this precious resource.

Water Shortage Context

  • Freshwater accounts for only 3% of the world's water, with a minuscule portion available for human use (~200,000 km3).

  • Economic Water Scarcity: Some regions lack infrastructure to utilize available freshwater resources, leading to water conflicts.

Climate Change and Flooding

  • The increasing severity and frequency of floods are influenced by climate change and human activities like urbanization.

  • Flood Types: Varied causes include snowmelt, heavy rainfall, ice jams, and dam failures.

Flood Control Measures

  • Effective flood management strategies include:

    • Watershed Management: Careful oversight of land and water use.

    • Flood Prediction Systems: Improved technology for early warning and response.

    • Building Regulations: Implementing codes to minimize risks in flood-prone areas.

Drought Conditions

  • Definitions of drought include meteorological, agricultural, and socio-economic aspects.

  • Various causes of droughts can range from natural climatic variability to anthropogenic factors.