Hertfordshire University - Rainwater Harvesting case study
1. Ecozi Case Study
College Lane Campus - Rainwater Harvesting
Client: Hertfordshire University
Building Type: Student Forum
Roof: 100% membrane
Catchment Area: 2,450m²
Rainwater Apps: 86 WCs for student and staff use
Sustainability: BREEAM – Very Good
Built: 2009
Ecozi Ltd, Unit 2 Churchlands Business Park
Ufton Road, Harbury
CV33 9QX
01926 614 002
info@ecozi.com
www.harvestingrainwater.co.uk
2. About Ecozi – Rainwater Harvesting Systems:
Ecozi is a specialist rainwater harvesting and grey water recycling system provider.
Ecozi design, supply, install and maintain water recycling systems throughout the UK for commercial and residential
customers.
Ecozi work to all industry standards and are members of the UK Rainwater Harvesting Association. With our
experience from installation, commissioning and maintenance the service levels offered by Ecozi are amongst the
highest in the industry.
Market leading German manufacturers are key supply partners to Ecozi, providing advanced reliable systems with low
risks to end customers.
Ecozi Ltd, Unit 2 Churchlands Business Park
Ufton Road, Harbury
CV33 9QX
01926 614 002
info@ecozi.com
www.harvestingrainwater.co.uk
3. Rainwater Harvesting Requirements:
Rainwater harvesting technology was selected to help achieve an ‘very good’ BREEAM rating, installed for all WCs.
Waterless urinals were used to further reduce water consumption. The building user profile is principally social providing a
large venue for student entertainment and social facilities. The building is used 7 days a week with peak demand on WCs
coinciding with major social events in the evenings. HyproDuo — the flagship appliance from Ecozi, was installed to
provide reliable service with 3-phase Wilo pumps to supply WCs directly upon demand.
Ecozi Ltd, Unit 2 Churchlands Business Park
Ufton Road, Harbury
CV33 9QX
01926 614 002
info@ecozi.com
www.harvestingrainwater.co.uk
4. Project Challenges:
The 36,000L precast concrete tank was placed in final position by the truck
mounted crane in 50 minutes. The precast tank specified by Faber Mansell on
behalf of Willmott Dixon was procured by MITIE Engineering Services. The tank
will yield up to 770m³ of rainwater per year from the 2,350m² roof area.
The 36,000L precast concrete tank was placed into the final position by truck
mounted crane. Only a crushed base is required, with no concrete backfill. The
precast tank saved £4,000 by eliminating a concrete base and backfill that would
have been required with an alterative GRP tank. By eliminating concrete cure
time 2 days were also saved on installation time. The precast tank has a standard
surface load rating suitable for a 40t truck, saving additional structural design
cost when located under a vehicular area. The HyproDuo factory built appliance
requires just 4 pipe connections and 3 electrical plug and socket hook-ups prior
to commissioning. Just two connections are required at the tank to complete the
simple installation.
The tank was also supplied pre-fitted with a DN200 anti-flood valve and overflow
siphon. Prefitting of these components in the tank saved £350 in installation
costs be eliminating an access chamber downstream of the tank. Ecozi
differentiates its self by offering as many pre-assembled components as possible
to reduce installation costs and provide the highest system reliability possible.
Ecozi Ltd, Unit 2 Churchlands Business Park
Ufton Road, Harbury
CV33 9QX
01926 614 002
info@ecozi.com
www.harvestingrainwater.co.uk
5. Contact Details:
Ecozi Ltd
Unit 2 Churchlands Business Park
Ufton Road
Harbury
CV33 9QX
Tel:01926 614 002
Email: info@ecozi.com
Visit our website at: www.ecozi.com
Subscribe to our blog: www.harvestingrainwater.co.uk
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