Module 7: Introduction to Sustainable Water Issues and Florida Management

Importance and Global Distribution of Water Resources

• Essential Nature of Water:     * Water is foundational for all forms of life, the health of ecosystems, and human development.     * Access to water is recognized as a universal human right.     * Water issues are intrinsically linked to all United Nations Sustainable Development Goals (SDGs).

• Global Distribution of Earth's Water:     * Total Global Water:         * Oceans: $96.5\%$         * Freshwater: $2.5\%$         * Other saline water: $0.9\%$     * Freshwater Breakdown ($2.5\%$ of global total):         * Glaciers and ice caps: $68.7\%$         * Groundwater: $30.1\%$         * Surface water and other freshwater: $1.2\%$     * Surface Water and Other Freshwater Breakdown ($1.2\%$ of freshwater):         * Ground ice and permafrost: $69.0\%$         * Lakes: $20.9\%$         * Soil moisture: $3.8\%$         * Swamps and marshes: $2.6\%$         * Rivers: $0.49\%$         * Living things: $0.26\%$         * Atmosphere: $3.0\%$

Global Water Scarcity and Drivers

• Current State of Scarcity:     * Over $2 \times 10^9$ (2 billion) people currently lack access to safe drinking water.     * Water stress is increasing due to rapid population growth.     * Climate change is intensifying existing shortages through altered weather patterns.

• Primary Drivers of Water Shortage:     * Overuse and Mismanagement: Excessive withdrawal for agriculture and industry beyond replenishment rates.     * Pollution: Discharge of industrial waste and untreated sewage.     * Environmental Loss: Deforestation and the degradation of watersheds reduce the natural ability to capture and store water.

• Access and Inequality:     * Disparities: Significant gaps exist between urban and rural access.     * Infrastructure: Low-income regions systematically lack the necessary infrastructure for water treatment and delivery.     * Gender: There is a gendered burden regarding water collection, disproportionately affecting women and girls in developing regions.

Climate Change, Pollution, and Public Health

• Climate Change Impacts on the Water Cycle:     * Rising atmospheric $\text{CO}_2$ leads to the intensification of the global water cycle.     * Temperature Effects: Increases in air and water temperature, leading to thermal expansion and stratification.     * Extreme Events: Increased frequency and intensity of heatwaves, droughts, wildfires, floods, hurricanes, storm surges, and dust storms.     * Physical Changes: Melting ice and rising sea levels.     * Ocean Impacts: $\text{CO}_2$ absorption leads to ocean acidification and deoxygenation.

• Contaminants and Pollution:     * Chemical/Physical Agents: Trace metals, radionuclides, nutrients, organic contaminants, and plastics.     * Agricultural Runoff: High levels of fertilizers and pesticides entering water bodies.     * Industrial Discharge: Direct release of contaminants into ecosystems, impacting both human health and biodiversity.

• Global Sanitation and Hygiene Statistics (2020 Data):     * $54\%$ of the world's population uses a safely managed sanitation service.     * $2.2 \times 10^9$ (2.2 billion) people lack safely managed drinking water services.     * $74\%$ of the global population uses a safely managed drinking water service.     * $2.8 \times 10^9$ (2.8 billion) people lack access to basic sanitation services (toilets/latrines).     * $1$ in $4$ people lack handwashing facilities with soap and water at home.     * $85\%$ of the planet's wetlands have been lost.     * Diarrhea linked to inadequate Water, Sanitation, and Hygiene (WASH) kills approximately $525,000$ children under five annually.     * Water scarcity is projected to create $700 \times 10^6$ (700 million) climate refugees by the year $2030$.

The Water-Energy-Food Nexus

• Nexus Concept: Water, energy, and food are inextricably linked; water is required to produce food and generate energy, while energy is required to treat and transport water.

• Trade-offs: Decisions in one sector often impact the others; the Nexus approach seeks to balance these trade-offs for sustainability.

• Agricultural Water Use and Technology:     * Irrigation Efficiency: Emphasizes drip irrigation and rainwater harvesting to conserve water.     * Internet of Things (IoT) in Irrigation:         * Benefits include improved agriculture management, optimized crop growth rates, and real-time monitoring of products.         * Sensors monitor sunlight, temperature, and humidity to predict future needs.         * Results in decreased water and electricity usage while maintaining soil nutrients and structure.

• Freshwater Footprint per Kilogram of Food Product ($L/kg$):     * Cheese: $5,605\,L/kg$     * Nuts: $4,134\,L/kg$     * Fish (farmed): $3,691\,L/kg$     * Prawns (farmed): $3,515\,L/kg$     * Beef (dairy herd): $2,714\,L/kg$     * Rice: $2,248\,L/kg$     * Groundnuts: $1,852\,L/kg$     * Lamb & Mutton: $1,803\,L/kg$     * Pig Meat: $1,796\,L/kg$     * Beef (beef herd): $1,451\,L/kg$     * Poultry Meat: $660\,L/kg$     * Wheat & Rye: $648\,L/kg$     * Milk: $628\,L/kg$     * Eggs: $578\,L/kg$     * Peas: $397\,L/kg$     * Tomatoes: $370\,L/kg$     * Maize: $216\,L/kg$     * Apples: $180\,L/kg$     * Bananas: $115\,L/kg$     * Citrus Fruit: $83\,L/kg$     * Wine: $79\,L/kg$     * Potatoes: $59\,L/kg$     * Root Vegetables: $28\,L/kg$

Water Consumption in Industry and Energy

• U.S. Water Use (2015 Data, Million Gallons per Day - mgd):     * Thermoelectric Power: $133,000\,mgd$ surface water; minimal groundwater.     * Irrigation: $60,900\,mgd$ surface water; $57,200\,mgd$ groundwater (Total $118,000\,mgd$).     * Public Supply: $23,800\,mgd$ surface water; $15,200\,mgd$ groundwater (Total $39,000\,mgd$).     * Industrial: $12,000\,mgd$ surface water; $2,710\,mgd$ groundwater (Total $14,800\,mgd$).     * Aquaculture: $7,550\,mgd$ surface water; $5,950\,mgd$ groundwater (Total $12,000\,mgd$).     * Mining: $2,870\,mgd$ surface water; $1,130\,mgd$ groundwater (Total $4,000\,mgd$).     * Domestic (Self-supplied): $597\,mgd$ surface water; $2,663\,mgd$ groundwater (Total $3,260\,mgd$).     * Livestock: $760\,mgd$ surface water; $1,240\,mgd$ groundwater (Total $2,000\,mgd$).

• Electricity Production Water Intensity:     * Measured in gallons of water per megawatt-hour ($gal/MWh$):         * Nuclear: $1,101\,gal/MWh$         * Coal: $1,005\,gal/MWh$         * Concentrated Solar: $906\,gal/MWh$         * Biomass: $878\,gal/MWh$         * Natural Gas: $255\,gal/MWh$         * Geothermal: $15\,gal/MWh$

• Geothermal Power Plant Process:     1. Hot water is pumped from underground and turned into steam in a flash tank.     2. Steam turns a turbine.     3. The turbine turns a generator to produce electricity.     4. Electricity is exported to the grid; water vapor is released from cooling towers or reinjected via an injection well.

Resource Management and Governance

• Groundwater Importance:     * Groundwater constitutes more than $80$ times the volume of water available in all lakes and rivers combined.     * It supplies over $24\%$ of daily water withdrawals in the United States.     * It acts as a massive natural storage sink in the hydrological cycle.     * Risks: It is being used faster than natural replenishment and is highly susceptible to long-term contamination.

• Integrated Water Resource Management (IWRM):     * A coordinated process to balance social, ecological, and economic needs.     * Focuses on participatory decision-making and cross-sector coordination.

• Urban Water Management:     * Implementation of smart metering and resilient supply networks.     * Focus on stormwater management and flood control to handle climate extremes.

• Governance and Water Rights:     * Policy frameworks involve pricing, subsidies, and efficiency incentives.     * Transboundary water issues (shared rivers/aquifers) require international cooperation, treaties (like the UN Watercourses Convention), and shared monitoring.

• Virtual Water:     * The concept of "embedded" water—the amount of water used to produce goods like food or clothing. Identifying virtual water trade helps water-scarce countries manage resources by importing water-intensive goods.

• Water Justice Action Agenda:     * Focuses on community leadership, indigenous empowerment, emergency preparedness, renter's rights, water affordability, and natural/built infrastructure for clean water.

Case Study: Florida's Water Management and the Floridan Aquifer

• The Floridan Aquifer System:     * An underground layer of permeable rock (limestone), sand, or gravel holding groundwater.     * Covers approximately $100,000$ square miles across all of Florida and parts of Alabama, Georgia, and South Carolina.     * Provides drinking water for over $11 \times 10^6$ (11 million) Floridians and millions of tourists.     * Total withdrawals (2015): Approximately $2.3 \times 10^9$ (2.3 billion) gallons per day.

• Management Framework:     * Managed by five Water Management Districts (WMDs):         1. Northwest Florida WMD         2. Suwannee River WMD         3. St. Johns River WMD         4. Southwest Florida WMD         5. South Florida WMD     * Permitting: Wells with a diameter of $6"$ to $8"$ or larger, or those capable of removing $100,000\,gpd$ (gallons per day), require a Consumptive Use Permit.     * Economic Note: Owners pay a fee for the permit, but there is no fee for the actual groundwater withdrawn.

• Issue #1: Groundwater Overpumping and Sinkholes:     * Plant City Case (January 2010): During a freeze event, farmers pumped excessive groundwater for crop protection. This caused groundwater levels to drop to record lows.     * Result: Over $110$ sinkholes formed in the Dover/Plant City area, destroying homes and roads. One home in Plant City sank three feet and was declared a total loss.

• Issue #2: Nitrate Pollution:     * Aquifer Recharge: Rainwater enters unconfined aquifers through well-drained sandy soils. While essential for recharge, these unconfined areas are highly vulnerable to surface contaminants.     * Nitrogen Cycle Terms:         * Nitrogen Fixation: Atmospheric nitrogen transformed into organic nitrogen by soil bacteria.         * Attenuation: Plants take up nitrogen via roots, reducing the amount reaching groundwater.         * Nitrogen Loading: Human-added nitrogen from fertilizers, wastewater, and livestock waste.     * Santa Fe River BMAP (Best Management Action Plan) Statistics:         * Residential/Sports Turf: $161,000\,lbs$ of nitrogen reach groundwater annually.         * Farm Fertilizers: $1.05 \times 10^6\,lbs$ of nitrogen reach the aquifer annually.         * Livestock Waste: $347,000\,lbs$ of nitrogen reach the aquifer annually.         * Total Impact: Approximately $63$ dump trucks' worth of nitrogen enter the groundwater annually in the Santa Fe River BMAP area.

Campus Features and Activity

• University of Florida Sustainability Walking Tour Sites:     * Lake Alice (Watershed drain).     * Bioswale at the Southwest Recreation Center.     * Permeable pavement at the Bat House parking lot and SW 7th Ave.     * Curb cuts at the O’Connell Center parking lot.     * Flow-through planter at Farrior Hall.     * Rain barrels and green roof at the Rinker Hall.

• Activity: The Great Water Heist:     * Scenario: A transboundary water conflict negotiation simulation.     * Stakeholder Roles: Upstream/Downstream governments, Local farmers, Indigenous communities, Bottled water corporations, environmental NGOs, and UN mediators.     * Objectives: Determine wants, fears, non-negotiables, and compromises to reach a fair water-sharing treaty.