Rainharvesting Design

Commercial water charges continue rising – harvested rainwater provides free water for non-potable (drinking water) uses, reducing operating costs over decades of building operation. Water usage for non-potable applications:

• Toilet Flushing: Occupancy patterns, flush volumes, dual-flush arrangements
• Washing Machines: Usage frequency, water consumption per cycle
• Irrigation: Landscape area, plant requirements, seasonal patterns
• Industrial Process: Usage rates, quality requirements, seasonal variations

Corporate sustainability targets increasingly require water conservation measures. Rainwater harvesting demonstrates environmental commitment and contributes to certification scores.

Reducing reliance on mains water improves resilience during supply interruptions and reduces peak demand on water company infrastructure.

Some Local Planning Authorities require water conservation measures as planning conditions. Professional rainwater harvesting design satisfies these requirements and demonstrates compliance.

WCI Consulting Engineers designs rainwater harvesting systems for domestic and commercial applications, from simple garden irrigation through to complex commercial systems serving toilet flushing, washing, and process water requirements.

Our designs balance capital investment against operational savings, ensuring systems deliver genuine benefit rather than becoming expensive installations with minimal return. We size systems realistically, specify appropriate technology and integrate with building services and site drainage effectively.

As part of WCI Group, we maintain water systems long-term. Our designs reflect maintenance reality – access for filter cleaning, tank inspection, pump servicing – ensuring systems remain functional for decades, not just at completion.

Rainwater harvesting affects site drainage design as reduced runoff from harvested catchments, overflow provisions and drainage network interaction. As drainage specialists, we integrate these elements seamlessly.

Not all roofs suit rainwater harvesting – we assess suitability and collection efficiency realistically.

Residential, commercial and mixed-use developments where rainwater harvesting satisfies planning conditions, achieves sustainability targets, or reduces long-term operating costs for retained buildings.

Rainwater harvesting design integrated with your building proposals. We coordinate tank locations, pipework routing, and building services integration with your architectural and M&E design.

Offices, warehouses, manufacturing facilities and institutional buildings seeking to reduce water costs and demonstrate environmental responsibility through rainwater harvesting.

Education, healthcare, and local authority buildings where sustainability credentials, operating cost reduction, and environmental education benefits justify rainwater harvesting investment.