System 3: Water

Beyond Sustainability - The Case for Regenerative Design
- ○ Overview
- ○ What Regeneration Means
- ○ Systems Thinking: The Foundation of Regenerative Design
- ○ The Pangea Model: Six Integrated Systems
- ○ The Difference Between Sustainability and Regeneration
- ○ Why Off-Grid?
- ○ The Global Relevance of These Principles
Understanding Place - Climate, Site, and Solar Geometry
- ○ Overview
- ○ Climate Zones and Bioclimatic Design
- ○ Solar Geometry: The Foundation of Passive Design
- ○ Orientation: The Most Important Passive Solar Decision
- ○ Site Analysis: Reading the Land
- ○ Indigenous and Vernacular Building Wisdom
The Six Integrated Systems - An Overview
- ○ Overview
- ○ System 1: Structure and Natural Materials
- ○ System 2: Energy
- ○ System 3: Water
- ○ System 4: Liquid Waste Treatment
- ○ System 5: Food Production
- ○ System 6: Community
- ○ Systems Integration: Where the Magic Happens
Building with the Earth—Natural Materials
- ○ Overview
- ○ Embodied Energy: The Hidden Environmental Cost
- ○ Tire Walls: Structural Rammed Earth
- ○ Adobe: Ancient Sun-Dried Earth
- ○ Cob: Sculptural Monolithic Earth
- ○ Can and Bottle Walls: Art from Waste
- ○ Natural Plasters: Earth, Lime, and Silica
Passive Solar Design - Heating and Cooling Without Machines
- ○ Overview
- ○ The Three Pillars of Passive Solar: Gain, Mass, Insulation
- ○ Direct Gain Systems
- ○ Sunspaces and Greenhouses
- ○ Trombe Walls
- ○ Natural Ventilation and Passive Cooling
- ○ Shading
Off-Grid Energy Systems - Power from the Sun
- ○ Overview
- ○ Load Analysis: Know Your Demand
- ○ Solar Photovoltaic Systems
- ○ Battery Storage
- ○ Charge Controllers and Inverters
- ○ Wind Energy
- ○ Community Microgrids
Water - Catching, Storing, and Cycling
- ○ Overview
- ○ The Water Cycle and Catchment Design
- ○ First Flush Diverters
- ○ Cisterns: Storage and Design
- ○ Water Filtration: From Rain to Potable
- ○ Solar Water Heating
Liquid Waste Treatment - Botanical Systems
- ○ Overview
- ○ Greywater vs. Blackwater
- ○ Interior Botanical Cells: Greywater Treatment
- ○ Exterior Botanical Cells: Blackwater Treatment
- ○ The gWOM and tWOM: Control Systems
- ○ Composting and Nutrient Cycling
Food Systems—Buildings That Feed
- ○ Overview
- ○ The Greenhouse: Thermal Buffer and Food Zone
- ○ Interior Botanical Cells as Food Zones
- ○ Aquaponics
- ○ Composting Systems
- ○ Exterior Growing Systems
Community Design - Scaling Up
- ○ Overview
- ○ From Building to Community: Shared Infrastructure
- ○ Land Planning and Earthworks
- ○ Community Governance
- ○ Land Tenure and Development Models
The Integrated Design Process
- ○ Overview
- ○ The Design Process: From Vision to Construction
- ○ Permitting and Code Navigation
- ○ The Pangea Textbook Series
Appendix A: Glossary of Key Terms
- ○ Overview
Appendix B: The Pangea Textbook Series
- ○ Overview
Appendix C: Key Design Principles at a Glance
- ○ Overview
The Regenerative Community Vision
- ○ Overview
- ○ What Makes a Community Regenerative?
- ○ Design Principles for Community Scale
- ○ The Six Systems at Community Scale
- ○ Learning from Indigenous Land Stewardship
- ○ Case Context: The Taos Bioregion
Site Assessment and Land Reading
- ○ Overview
- ○ The Site Assessment Framework
- ○ Reading Topography
- ○ Reading Hydrology
- ○ Solar and Wind Analysis
- ○ Soil Assessment Methods
- ○ Ecological Site Reading
- ○ Documentation and Synthesis
Land Use Law and Legal Frameworks
- ○ Overview
- ○ Zoning and Land Use Regulations
- ○ Water Rights
- ○ Legal Entity Options for Community Ownership
- ○ Subdivision and Parcelization
- ○ Environmental Review
Master Planning for Regenerative Communities
- ○ Overview
- ○ The Zone Planning Framework
- ○ Sector Analysis
- ○ Movement Systems and Access Design
- ○ Building Cluster Design
- ○ Open Space and Ecological Design
- ○ Shared Infrastructure Placement
Infrastructure Systems Integration
- ○ Overview
- ○ Community Energy Microgrid Design
- ○ Community Water Systems
- ○ Shared Liquid Waste Treatment
- ○ Road and Path Network as Infrastructure
- ○ Telecommunications Infrastructure
Housing Typologies and Density Design
- ○ Overview
- ○ The Cohousing Model
- ○ Clustered Single-Family Housing
- ○ Accessory Dwelling Units and Graduated Density
- ○ Affordable Housing Integration
- ○ Designing for Demographics
Community Governance Structures
- ○ Overview
- ○ Core Governance Functions
- ○ Decision-Making Models
- ○ Sociocracy and Governance Innovation
- ○ Financial Governance
- ○ Conflict Resolution Systems
- ○ Governing Documents
Economic Models for Community Development
- ○ Overview
- ○ Community Revenue Streams
- ○ Internal Economy and Skill Exchange
- ○ Financing Community Development
- ○ Community Land Value and Equity
- ○ The Pangea Development Model
Phased Development Strategy
- ○ Overview
- ○ Phase Zero: Vision, Land, and Legal Structure
- ○ Phase One: Foundation Infrastructure
- ○ Phase Two: Community Infrastructure and Expansion
- ○ Phase Three and Beyond: Full Buildout and Refinement
- ○ Adaptive Management
Community Resilience and Long-Term Stewardship
- ○ Overview
- ○ Resilience to Physical Shocks
- ○ Ecological Succession Management
- ○ Social Resilience and Community Culture
- ○ The Stewardship Endowment
- ○ Knowledge Transmission
- ○ Pangea Academy as Stewardship Infrastructure
Appendix A: Legal Entity Comparison Chart
- ○ Overview
Appendix B: Community Design Checklist
- ○ Overview
- ○ Site Assessment and Legal Foundation
- ○ Master Plan
- ○ Infrastructure Systems
- ○ Housing and Buildings
- ○ Governance and Economics
- ○ Long-Term Stewardship
Appendix C: Glossary of Community Development Terms
- ○ Overview

In a regenerative building, water does not come from a municipal supply. It comes from the sky. Rainwater harvested from the roof is the primary water source, stored in cisterns and filtered to potable standard for all household uses. This approach is not exotic: rainwater harvesting has been the primary water supply for billions of people throughout human history, and it continues to be practiced at scale in many parts of the world today.

The design of a rainwater harvesting system begins with the site’s precipitation data and the roof’s catchment area. A simple formula relates annual rainfall, catchment area, and collection efficiency to determine how much water can be collected. Cistern size is then determined by how much storage is needed to bridge the longest dry period that can reasonably be expected. The Water Textbook, Book 5 of this series, covers the complete design and construction of a rainwater harvesting and treatment system, including cistern types, filtration components, the Water Organizing Module (WOM), and solar water heating.

The water system is deeply connected to the building’s other systems. Water harvested from the roof passes through a first-flush diverter that discards the initial, most contaminated runoff, then flows into storage cisterns. It is filtered through a series of stages, sediment, carbon, and microbial filtration, before becoming potable. Solar thermal collectors heat domestic hot water. The treated water then enters the liquid waste treatment system, beginning its second cycle through the building.

System 3: Water

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System 3: Water

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About the Author: PangeaAcademy

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