A sustainable courtyard with water recycling is not primarily a technology project. It is a design problem: how to integrate water capture, storage, and reuse into the spatial and material logic of the courtyard from the beginning.
In MÉTODO, sustainability is a respuesta climática — a response to the conditions of the place, not a set of features applied after the design is finished.
Rainwater Capture as a Courtyard System
In climates with distinct wet and dry seasons — Colorado, central Mexico, the US Southwest — a courtyard can be designed to capture and store rainfall for use in the water feature and landscape irrigation during the dry months.
The system elements:
- Roof drainage directed to a cistern: the courtyard roof area and any adjacent sloped surfaces collect rainfall and route it to a below-grade or partially buried storage tank
- First-flush diverter: the first portion of each rain event, which carries the most contaminants from the roof surface, is automatically diverted to drainage; the cleaner subsequent flow fills the cistern
- Pump and distribution: a small submersible or inline pump moves stored water to the courtyard fountain, drip irrigation, or both
- Overflow connection: when the cistern is full, overflow goes to a permeable drywell, a bioretention area, or the municipal storm sewer
This system is integrated into the architectural drawings before any cistern is purchased. The cistern size is determined by the catchment area, the local rainfall data, and the anticipated demand — not by what is available at a plumbing supplier.
Closed-Loop Recirculation in the Water Feature
A recirculating water feature reuses its own water through a pump-and-filter loop. This is not recycling in the greywater sense — it is simply not running water to drain continuously. But it is the baseline for sustainable water feature design.
A closed-loop feature requires:
- A pump sized to the hydraulic head and flow requirements of the feature
- A filter to prevent particulate from accumulating in the basin
- An automatic fill valve to compensate for evaporation losses
- A drain connection for maintenance cleaning
In a sustainable courtyard, the makeup water for evaporation comes from the rainwater cistern when available. During dry periods, the municipal supply supplements or replaces the cistern supply.
Greywater for Courtyard Irrigation
In jurisdictions where it is permitted, treated greywater — from sinks, showers, and laundry (excluding toilets) — can supply drip irrigation for non-edible courtyard plants. This requires a simple treatment system (a mulch biofilter is the most common low-maintenance approach) and drip distribution that directs water below the soil surface.
Colorado's current regulations allow greywater reuse for outdoor irrigation with specific treatment and application requirements. Mexico City's building codes are evolving on this point. We verify local regulations as part of the design documentation for any project that includes greywater reuse.
The courtyard design must accommodate the greywater system: a distribution manifold, valve access, and a visual separation between the greywater drip zone and the water feature.
Permeable Surfaces and Stormwater Management
A sustainable courtyard also manages rainwater at the surface. Stone and concrete paving that directs all runoff to a single drain concentrates storm loads on the municipal system. Permeable or semi-permeable design alternatives:
- Gravel or decomposed granite between stone pavers with a permeable base
- A planted zone that accepts overflow from the paved area
- A bioswale along the courtyard perimeter that filters and infiltrates runoff
In Denver, the city's stormwater management guidelines incentivize on-site infiltration for residential projects. In Mexico City, where the aquifer is being depleted and flooding is a seasonal problem, capturing rather than draining stormwater is both environmentally sound and locally relevant.
The Process Before Technology
The process before the style applies here. We do not begin a sustainable courtyard project by selecting a cistern product. We begin by mapping the catchment area, estimating the demand, and drawing the integration of water management into the spatial design.
The technology — pumps, cisterns, filters — is specified to the design. The design is not adapted to available products.
Próximos pasos
A courtyard that recycles water is designed differently from one that relies entirely on municipal supply. The integration of capture, storage, and reuse must happen in the design drawings, not during construction. To understand how we incorporate water management into courtyard design, conoce el método de MÉTODO.