- Beyond Sustainability - The Case for Regenerative Design
- Understanding Place - Climate, Site, and Solar Geometry
- The Six Integrated Systems - An Overview
- Building with the Earth—Natural Materials
- Passive Solar Design - Heating and Cooling Without Machines
- Off-Grid Energy Systems - Power from the Sun
- Water - Catching, Storing, and Cycling
- Liquid Waste Treatment - Botanical Systems
- Food Systems—Buildings That Feed
- Community Design - Scaling Up
- The Integrated Design Process
- Appendix A: Glossary of Key Terms
- Appendix B: The Pangea Textbook Series
- Appendix C: Key Design Principles at a Glance
- The Regenerative Community Vision
- Site Assessment and Land Reading
- Land Use Law and Legal Frameworks
- Master Planning for Regenerative Communities
- Infrastructure Systems Integration
- Housing Typologies and Density Design
- Community Governance Structures
- Economic Models for Community Development
- Phased Development Strategy
- Community Resilience and Long-Term Stewardship
- Appendix A: Legal Entity Comparison Chart
- Appendix B: Community Design Checklist
- Appendix C: Glossary of Community Development Terms
Rainwater harvesting begins with the roof. Every square meter of roof that receives rainfall and drains to a gutter and downspout is a catchment surface. The amount of water that can be collected from a given roof in a given year is determined by a simple formula: Annual collection (liters) = Annual rainfall (mm) × Catchment area (m²) × Collection efficiency (typically 0.75–0.85, to account for evaporation, first flush losses, and roof absorption). For example, a building in Taos, New Mexico, with an annual rainfall of approximately 330 mm and a roof catchment area of 150 m², can expect to collect approximately 37,000 to 42,000 liters per year (330 × 150 × 0.80 = 39,600 liters). A household of two to three people using the conservative water budgets appropriate to a regenerative building (40 to 50 liters per person per day) will use approximately 30,000 to 55,000 liters per year….