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Rainwater Reclamation CPD SeminarPresented by Matthew Tickle

to

Suffolk and Essex

Energy & Environment Group

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Stormsaver Manufacturer and supplier of Stormsaver rainwater recovery systems

Solve drainage problems, minimise localised flood risks and save money by recycling rainwater which would otherwise go to drain.

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Presentation Overview Rainwater Facts

Typical uses

Lessons from Germany

Typical Installation and Filtration

Amount of Water to Collect

Payback and Case Studies

Why use a Specialist

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Rainwater Facts There is 18 times more rainfall in the UK than the net consumption of the

population – more than enough for our needs!

When combined with attenuation, rainwater recovery helps to reduce potential flood risks. Synergy with Sustainable Drainage Scheme (SDS)

Up to 50% of water in most commercial, domestic or industrial applications can be supplied by rainwater rather than mains water

Rainwater is FREE – save money on your water bill.

Positive impact on the environment – BREEAM Points

Utilising recycled rainwater helps to reduce potential water shortages.

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Rainwater or Grey water ? RainwaterOriginal source of all water supplies. Reservoirs,rivers,aquifers.Rainwater systems collect water from roof and/or surrounding area before it drains away.

Grey waterWastewater from sinks, baths, showers, domestic appliances, except sink and dishwasher wastewater.System collects water before it reaches the sewer/drain.

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Typical uses in a Domestic /Commercial building

Recycled rainwater can be used for;

Garden watering

Vehicle washing

Toilet flushing

Urinal flushing

Washing machines

Property cleaning (window washing, hosing down)

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Lessons from Germany

Mains water costs are 2-3 times higher. Rainwater systems for 15 –20 years >2,300,000 systems installed. Mandatory installation in some areas for new builds. Subsidies available up to £1000/system

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Rainwater collected from roof area Pre-tank filter

Stormsaver® storage tankInlet calmerSubmersible pump Floating suction filterLevel sensorsStormsaver® rain processor unitStormsaver® header tankMains water top-up

General design and installation principles

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Disinfection.

UV – requires low turbidity, removal of particles to prevent sheltering of organisms. On all the time.

Electricity costs and replacement bulbs costly : ~ 200 kWh per year : more economic the more water is treated.

Ionisation : Trace elements used to sterilise water, lower energy costs, replacement electrodes.

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Filtration Filtration is key to good water quality. “prevention or removal of organic debris before storing

rainwater was found to be important in maintaining good

water quality” BSRIA TN 7/2001.

3 stage process : Stage 1 : pre tank 440 micronsStage 2 : pump 180 micronsStage 3 : processor 35 microns

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How much water is collected ? The larger the roof area and the demand, the greater the

financial savings.

Vol. Collected m3 = roof area m2 x ave. annual rainfall x collection co-efficient x filtration co-efficient

Pitched ~ 90%Flat ~50%

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Information required to size a system

What is the usable roof area? What is the type of building? School, prison, residential etc. What is the site post code / location? What is the demand of the building? Either in L/S, number of W/C’s

or occupancy. Also what are the operating hours? What is the type of roof drainage? Syphonic or gravity. If syphonic

what is the flow rate? Is there room for a header tank or will it require a pressure boosted

system? Do you require UV Disinfection?

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Other Considerations

A syphonic break is required before the pre tank filter if building has a syphonic roof drainage system such as Fullflow.

Fall across pre tank filter and tank- 400mm.

Rainwater recovery systems do require a degree of maintenance.

Savings and payback‘Reduce the spiraling cost of water’

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Cost of water is increasing as demand for supply increases.

Most commercial systems see an efficiency of between 50-75%

Return on capital cost and installation usually within 5-10 years

Enhanced Capital Allowance (ECA) approved

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Case Studies

Application Crate Wash

Roof Area 5900 sqm

Demand 25m3/day

Efficiency 51%

Saving p/a £8390

Location Scotland

ASDA – Falkirk, Scotland

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Case Studies

Application WCs

Roof Area 1918 sqm

Occupants 450

Efficiency 41%

Saving p/a £1245

Location Dorset

Conifers School, Weymouth

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Case Studies

Application WCs

Roof Area 17000 sqm

Occupants 3000

Efficiency 62%

Saving p/a £15,770

Location Scotland

Royal Bank of Scotland HQ

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Useful publications “Rainwater and grey water use in buildings – best

practice guidance” 2001 : CIRIA C539

“Rainwater and grey water in buildings – project report and case studies.”2001 : BSRIA TN7/2001

CIRIA Research Project 555 – SUDS

WRAS: Guidance Notes: 1999- 9-02-04 and 9-02-05

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Using a rainwater recovery specialist

Consultation with architects, consultants, mechanical engineers Bespoke design Site surveys / visits during installation. System commissioning Full service and maintenance contracts

Our friendly, fully trained technical staff offer support before, during and after installation

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Presentation Review Rainwater Facts

Typical uses

Lessons from Germany

Typical Installation

Filtration

Amount of Water to Collect

Payback

Case Studies

Why use a Specialist

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StormsaverStormsaver would like to thank you for the

opportunity to speak at this event and look forward to answering any of your questions.

Visit our web site at www.stormsaver.com