The Water Cycle and Catchment Design

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

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. Designing to this balance — calibrating roof area, cistern size, and water use to the local rainfall pattern — is the central challenge of off-grid water system design in water-scarce climates.

Roof material affects collection efficiency and water quality. Metal roofing (standing seam, corrugated) is the best choice for rainwater harvesting: it is smooth, non-toxic, and easily cleaned. Asphalt shingles are adequate but leach some contaminants in the first flush. Tar and gravel roofs, green roofs, and some treated wood shingles are not suitable for potable water harvesting without additional treatment.

The Water Cycle and Catchment Design

About the Author: PangeaAcademy

Pangea Academy

RECENT POSTS

QUICK LINKS

ACADEMY MENU

The Water Cycle and Catchment Design

Share This Story, Choose Your Platform!

About the Author: PangeaAcademy

Pangea Academy

RECENT POSTS

QUICK LINKS

ACADEMY MENU