CAPTURE

FILTER

RE-USE

STORE

DON’T WASTE A DROP

DISINFECT

Rainstream

Rainwater harvesting solutions

April 2014

Uniclass L73175

CI/SfB

(52)/(53) (T6)X

RWHSB3-PT

22

KG

ENABLING SUSTAINABLE BUILDING TECHNOLOGY

BREADTH AND DEPTH OF PRODUCT

SYSTEMS

TECHNICAL SUPPORT

LEADING EDGE EXPERTISE

SUSTAINABLE PRODUCTS & PRACTICES

MARKET LEADERSHIP

POLYPIPE BRAND VALUE ENGINEERED SOLUTIONS

CHALLENGING TRADITION

MANUFACTURING SCALE

INDUSTRY AUTHORITY

PRODUCT INNOVATION

Polypipe We design, develop and manufacture the widest

range of plastic piping products, with over

20,000 product lines available. Our primary focus

is on developing and supporting pragmatic

product systems through specific knowledge and

understanding of the residential, commercial,

civils and infrastructure market sectors. We

ensure that customers can trust our unrivalled

expertise to provide value engineered, fit for

purpose piping solutions, for the growing

diversity and complexity of construction and

building technology challenges they face.

2

3

Polypipe from roof to re-use

The Importance of Water Re-use and Legislation

The Rainstream System

Rainstream Components

A Specialist Team of Water Management Experts

Polypipe from roof to re-use

The more we build, the greater the strain we put on drinking water supplies. As experts in water management for residential, commercial and infrastructure construction, Polypipe have the systems and knowledge to incorporate rain water harvesting as an integral part of what we are building.

Polypipe Rainstream represents one of the most innovative holistic rainwater harvesting systems,

delivering a range of highly effective solutions for the storage, filtration and reuse of rainwater in

todays commercial buildings.

With water becoming more scarce, an increase in hosepipe bans, reduced crop yields and failing

emergency supplies, the need to take better care of the drinking water we have has never been

more crucial. Polypipe Rainstream enables buildings to reduce their reliance on valuable potable water

supplies for applications such as toilet flushing, vehicle washing and irrigation where the use of drinking

water is simply not neccesary.

Contents

4 - 5

6 - 7

8 - 10

11

4

The Importance of Water Re-use and Legislation

National water levels Water supplies in England and Wales are much lower

than is commonly thought, despite high levels of

rainfall. This is because more and more rainfall falls on

to roofs, hardstanding areas and roads running into

the drainage network rather than replenishing

reservoirs and aquifers. In fact, we have less usable

water than perceived drier countries such as France

and Spain.

• England and Wales: 1,334 cubic metres of rainfall

per person

• France: 3,065 cubic metres of rainfall per person

• Spain: 2,785 cubic metres of rainfall per person

Water stress and water conservation Water stress is calculated for each water company

area using a formula that combines current and future

demand, current and future water availability and

forecast population growth.

The broad picture for England and Wales is shown

opposite, although it does not reflect security of supply

or water authority performance. In Scotland, although

rainfall is higher, much of it falls in unpopulated rural

areas. This means Scotland’s cities can be just as

susceptible to water stress as any other part of the UK.

Conserving water in today’s buildings really matters. Water supplies in the UK are under more sustained pressure today than at any other time.

A combination of population growth, the increased use of potable water

where it isn’t essential (for bathing, showering, watering gardens and flushing

toilets) and prolonged periods of drought all pose a very real threat to the

continued supply of clean water to everyone who needs it.

Serious

Moderate

Low

Normal risk

Drought Risk

At moderate risk

At high risk

In drought

Source - Environment Agency

Source - Environment Agency

5

The Importance of Water Re-use and Legislation

British Standard BS 8515:2009 Parts 1 & 2The definitive guide to standards in rainwater

harvesting. British Standard BS 8515:2009 gives

guidance on the design, installation, testing and

maintenance of rainwater harvesting systems for

all uses excluding human consumption. This includes

laundry, WC flushing and garden watering.

The Code for Sustainable HomesThe code sets targets for reducing the consumption of

potable mains water from its current average

level of 150 litres per person per day, to 80 litres. Code

credits are awarded on a graded scale,

from 1 (worst) to 6 (best).

BREEAMThe Building Research Establishment Environmental

Assessment Method (BREEAM) is now recognised as

the standard measure of sustainable building

design. It addresses environmental and sustainability

issues and enables developers to prove the

environmental credentials of their buildings to

planners and clients.

Building Regulations Approved Document H This important document places rainwater

harvesting at the top of a hierarchy of measures for

managing surface water in building development.

Following its recommendations not only helps to

reduce the pressure on drainage networks, but

provides the means to significantly reduce potable

water use too.

WASHING

27%

TOILETFLUSHING

43%

CLEANING

1%

URINALFLUSHING

20%

DRINKINGWATER

9%

OTHER

5%OUTDOOR

7%

DRINKING WATER

4%WASHING UP

8%

CLOTHES WASHING

13%WC FLUSHING

30%

SHOWERING

12%BATHS AND TAPS

21%

Water use in commercial buildings Water use in homes

Where we waste water Although all water that is supplied through the mains is potable, only about 5% is actually used for drinking or cooking.

On average a non-domestic building uses approximately 2,600 litres a day, with up to 80% of the water delivered for non-

potable applications such as toilet flushing. Much of this could be provided by harvested rainwater.

Key drivers for water conservation in buildings

6

The Rainstream System

Domestic and commercial capture and storagesolution utilising below ground and/or above groundtanks incorporating filtration and disinfection processes.Can be used with pressurised or gravity fed systems.

1

5

76

34

2

The flexible nature of the Polypipe Rainstream approach to rainwater re-use means that no two systems are ever

the same, as each one is designed to meet the specific requirements of an individual application. However, a number

of elements are common to many types of system and the operating principles are largely standard throughout.

Rainwater falling onto roofs can be collected by a

variety of means including guttering, channel

drainage and specialized roof drain systems (Terrain

Hydromax Siphonic Roof Drainage)

Pre-tank filtration then removes any larger debris

such as leaves, before the collected water passes to

the storage tank. Please note that filters can be

either mounted internally or externally to

the storage tank

The storage vessel is typically a large tank which

can be included within a building, surface

mounted externally or buried below ground.

Captured water is re-distributed with a floating

filter pump assembly.

1 3

2

4

7

The Rainstream System

10

8

9

An electronic control unit monitors and manages

the water levels in various parts of the system

delivering water on demand.

Third stage in-line filtration to remove finer

particles of debris before use.

A disinfection process can be used to kill off

bacteria and improve the quality of collected water.

Polypipe offer both UV and TiO2 disinfection.

Water is supplied on demand to a number of

outlets around the property and can be used

for many different purposes including toilet

and urinal flushing, laundry, vehicle washing

and irrigation.

A back flow prevention device stops a backward

flow of contaminated water from the sewer and

acts as a rodent barrier.

Outlet to the soakaway, attenuation or

stormwater sewer.

5 8

6

97

10

Polypipe Rainstream Advance Control Unit (ACU) -Only for use in direct supply systems

• Strong tank structure for installation without the need for

concrete around the main body of the tank

• Single sized granular backfill suitable in most applications

• No need to fill tank during installation

• Anti-microbial Biomaster tank lining

• Optional UV/Titanium Dioxide water disinfection

8

Rainstream components

It’s estimated each person in the UK uses as much as 50% more water today than they did 25 years ago.As almost 80% of the water we use is for non-potable purposes, rainwater harvesting is the single most effectiveway to reduce consumption and preserve resources.

Polypipe’s holistic solutions and range of products provide a practical and sustainable

method for easing water stress by capturing rainwater from roof areas before filtering

and storing it for re-use.

CAPTURE

FILTER

RE-USE

STORE

DON’T WASTE A DROP

DISINFECT

The first stage of any rainwater harvesting system is water capture, ie the process of

channeling raintwater from roofs via building drainage into storage vessels.

Utilising traditional or siphonic drainage systems, Polypipe Terrain offer a complete range of solutions for the capture

of rain water.

Capture

Terrain HydroMax siphonic drainage system The Terrain HydroMax siphonic rainwater drainage

system is designed to rapidly remove large volumes

of water typically deposited during extreme rainfall

events. Designed to run at full bore, the pipe

effectively ‘sucks’ the water from the roof area,

utilising smaller pipe diameters than traditional

gravity systems, whilst also significantly reducing the

number of both roof outlets and downpipes required.

9

Polypipe Terrain offers a number of systems for in line and other methods of filtration to

ensure rainwater meets the required standards prior to storage.

Even though it is not intended for human consumption, water for re-use is required

to go through a degree of filtration and disinfection. The first stage of this process is

carried out by filtration systems positioned between water capture and water storage

structures which serve to screen out leaves, insects, silt and other impurities.

A range of practical, efficient water storage solutions that retain non-potable

water for washing, irrigation, toilet flushing and other uses. As well as saving

water, they save space by storing water in underground structures and systems

or in discreet spaces within commercial premises.

Storage

Ridgistorm-XL: A high volume tanking solution made

from capped lengths of our proven large-scale

Ridgistorm-XL piping. Rainstream RXL offers all the

benefits of bespoke design and off-site fabrication,

allowing transportation of separate components that

can be assembled quickly and easily on-site using

electro-fusion jointing.

Biomaster® Anti-microbial Technology: Rainstream RXL incorporates an anti-bacterial lining that

prevents the development of bacterial colonies on the tank wall and stops microorganisms reproducing by

interrupting DNA and cell division. This helps reduce the risk of contamination and maintains water quality.

Filter

Polypipe Rainstream pre-tank filter Available in a wide range of units to suit different flow rates, Polypipe

Rainstream filters are designed in accordance with BS 8515 and can be

supplied for above and below ground applications.

Polypipe RainstreamPre-Tank Filter

Rainstream tanksAvailable in commercial configurations from10,000 litres

upwards. Rainstream tanks are maunfactured in the UK from

Ridgistorm XL.

Bespoke fabrication allows a variety of ground conditions

and site locations to be accommodated.

9

Rainstream Components

A number of disinfection systems can be employed in Polypipe’s Rainstream system utilising anti-microbial, UV and Titanium Dioxide techniques

Disinfection

From the widely recognised UV disinfection system and our

unique Titanium Dioxide system, Polypipe can align every

disinfection process to your precise requirements.

Ultra-violet only disinfectionUV treatment neutralises a wide range of bacteria, including

legionella, by stopping them reproducing. Polypipe Terrain UV units

are available in 60 litre to 175 litre capacities.H2O

O2 O2

O2 O2

TiO2

H2O

H2O

OH OH

OH OH

PHOTOLYSIS185nm wavelength

photonic energy

MICROORG.

PHOTOCATALYSIS254nm wavelength

photonic energy

Water fed from storage

tank

Titanium reactor

Water output for non-potable use

PatentedTitanium crystal coating

UV light source

Titanium Dioxide

disinfection process

Titanium Advanced Oxidisation This advanced process combines UV light and a titanium dioxide lining

to produce Hydroxyl radicals. Extremely effective against all micro-

organisms, these compounds break down cells at a molecular level,

leaving no residue and producing water of exceptional cleanliness and

quality. Titanium Advanced Oxidisation has the added advantage

of being a low maintenance, chemical free solution.

Polypipe Rainstream Advanced Control

Unit (ACU)

Polypipe Rainstream Titanium Disinfection

Water supply on demand to outlets

Filter

Once filtered and treated, harvested water can be used

in a wide range of applications including toilet and

urinal flushing, laundry, vehicle washing and irrigation to

save valuable water resources and reduce utility costs.

Toilet and Urinal Flushing: Even low volume flush toilets

use 4 litres of water every time the handle is pressed.

Rainwater harvesting stops precious water being wasted

in this way.

Laundry: Up to 20 litres of water can be used in a warm

wash. Or, to put it another way, up to 20 litres can be

saved by using harvested rainwater.

Irrigation: Storing and using water for irrigation helps

save valuable drinking water while preserving public

parks and private gardens.

Harvested rainwater can be used in a number of non potable applications as detailed below, potentially reducing mains water usage by up to 80%.

Re-use

10

111918

Civils and Infrastructure01509 615100

Commercial01622 795200

Market Sector LiteratureAdditional market sector literature is

available please visit www.polypipe.com or

contact the telephone numbers appearing

under each brochure.

Ventilation System and Product Selector

Ventilation Installer Training

All descriptions and illustrations in this publication are intended for guidance only and shall not constitute a ‘sale by description’. All dimensions given are nominal and Polypipe may modify and change the information, products and specifications from time to time for a variety of reasons, without prior notice. The information in this publication is provided ‘as is’ on September 2011. Updates will not be issued automatically. This information is not intended to have any legal effect, whether by way of advice, representation or warranty (express or implied). We accept no liability whatsoever (to the extent permitted by law) if you place any reliance on this publication you must do so at your own risk. All rights reserved. Copyright in this publication belongs to Polypipe and all such copyright may not be used, sold, copied or reproduced in whole or part in any manner in any media to any person without prior consent. is a registered trademark of Polypipe. All Polypipe products are protected by Design Right under CDPA 1988. Copyright © 2011 Polypipe. All rights reserved.

Literature

Water Management Solutions‘ROOF TO RIVER’

Offering a comprehensive range of standalone and modular

SUDS products, rainwater harvesting and surface water

treatment solutions plus legislative and technical support

services, Polypipe Water Management Solutions address the

requirements of every construction and civil engineering project.

Carbon Efficient Solutions‘SUSTAINABLE INDOOR ENVIRONMENTS’

Ever stricter building regulations and ever more environmentally

conscious customers are driving the demand for greener

building products and technologies. Polypipe fulfils that demand

with a full range of systems that enable collection, transmission,

emission and control in heating, ventilation and cooling systems.

Polypipe enabling sustainable building technologyPolypipe provides plastic piping systems that enable the effective installation and

performance of sustainable building technology, meeting the twin global challenges

of carbon reduction and water management.

Sector FocusOur product systems respond directly to sector-specific requirements thanks to focused

technical and development teams with hands on expertise in the following areas:

Underfloor Heating Systems

All literature available at: www.toolbox.polypipe.com

All literature available at: www.toolbox.polypipe.com

Residential

Polypipe offers the broadest range of

residential product and service solutions

for both new build and RMI applications,

as well as innovative solutions in response

to legislative and industry targets for more

sustainable housing.

Civils and Infrastructure Delivering performance and sustainability,

Polypipe’s surface water drainage and cable

management systems, supported by our

in-house fabrications team, offer civils and

infrastructure project planners a complete

suite of solutions.

Commercial

Major commercial projects from car parks

and high rise office blocks to hospitals,

educational premises and shopping

centres have all benefited from Polypipe’s

range of value engineered products and

comprehensive service support.

Polypipe Civils Product Selector

Residential01709 770000

Product Literature

Solutions Literature

WMS Residential

Rainstream

www.polypipe.com

Polypipe Terrain New Hythe Business Park

College Road

Aylesford

Kent

ME20 7PJ

Tel: +44 (0) 1622 795200

Fax: +44 (0) 1622 716796

Email: rainstream.technical@@polypipe.com

www.polypipe.com/terrain