Cardiff Bus Depot
Cardiff Bus Depot
Rainwater System
  • Client: Cardiff Bus
  • 26,000 litre tank
  • Wisy WFF150 Vortex filter
  • DAB triple booster set
  • DaRo 6-Series XO UV unit
Design Data
  • Usage: WCs and vehicle wash
  • Estimated usage: 2450 litres/day • Average annual rainfall: 1400 mm
  • Roof area: 500 m2
  • Expected annual rainwater usage: 894,000 litres
  • Capital cost: £24,800
  • Completion: Summer 2011
Other Green Design Features
  • Rainwater usage monitoring in operation
  • Indicative saving of 894 m3 per annum
Rainharvesting system Cardiff Bus Depot
Vehicle Washing Plant for Cardiff Bus

The Welsh capital’s public transport company Cardiff Bus operates a fleet of some 240 vehicles, all of which require washing on a regular basis. As this consumes a vast amount of water, it was decided to explore the idea of utilising rainwater for this purpose for the main bus depot.

Cardiff-based specialists Natural Power UK approached Rainharvesting Systems Ltd. and together we devised and supplied the rainwater harvesting system, which was installed in 2011.

The pre-existing buildings and surrounding large areas of paved surface called for an above ground tank. We then devised an unusual solution using a sectional tank with a separate compartment at one end into which was fitted the distribution pumps, UV disinfection system and controls.

In the first six months of operation the system collected and used 447,000 litres of rainwater, giving the client significant savings.

In 2011 the project won an award from the Sustainable Water Industry Group (SWIG) for the best example of a retro-fit water saving scheme.

Rainwater System
  • Client: Cardiff Bus
  • 26,000 litre tank
  • Wisy WFF150 Vortex filter
  • DAB triple booster set
  • DaRo 6-Series XO UV unit
Design Data
  • Usage: WCs and vehicle wash
  • Estimated usage: 2450 litres/day • Average annual rainfall: 1400 mm
  • Roof area: 500 m2
  • Expected annual rainwater usage: 894,000 litres
  • Capital cost: £24,800
  • Completion: Summer 2011
Other Green Design Features
  • Rainwater usage monitoring in operation
  • Indicative saving of 894 m3 per annum