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SEL Brochure Car Park Drainage

Car park drainage system using permavoid, permachannel and sudsagg

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<strong>SEL</strong> Surface Water Solutions<br />

Sustainable <strong>Car</strong> <strong>Park</strong> <strong>Drainage</strong><br />

<strong>SEL</strong> Environmental Ltd, Canal House, Bonsall Street, Blackburn BB2 4DD


<strong>SEL</strong> Surface Water Solutions<br />

Index<br />

Page 2 Introduction<br />

Page 3 Typical detail for<br />

Permachannel against a<br />

kerb<br />

Page 4 System benefits<br />

Typical detail for<br />

Permachannel in open<br />

areas<br />

Page 5 Typical detail for<br />

Permachannel in open<br />

areas<br />

<strong>SEL</strong> support services<br />

Page 6 Why choose the <strong>SEL</strong> <strong>Car</strong><br />

<strong>Park</strong> <strong>Drainage</strong> system<br />

Page 7 Typical detail for the <strong>SEL</strong><br />

flow control chamber<br />

Page 8 <strong>SEL</strong> Contact details<br />

Internal weirs trap oils<br />

Residual oil is trapped and treated<br />

within the Permavoid biomat<br />

Introduction<br />

Innovative Source Control Solution for <strong>Car</strong> <strong>Park</strong> <strong>Drainage</strong><br />

The <strong>SEL</strong> <strong>Car</strong> <strong>Park</strong> System provides a solution for the management of surface water runoff from<br />

car park and access road hard surfacings. The system comprises a series of treatment phases<br />

which have been specifically developed to provide the ideal source control solution to meet the<br />

requirements of all current guidelines and legislation relating to SUDS, whilst incorporating<br />

traditional impermeable surfacings such as macadam, asphalt, concrete and standard block<br />

paving.<br />

The System provides attenuation, incorporating multiple stages of water treatment and flow control<br />

within the constructed layers directly beneath the finished surface. By introducing source control<br />

systems (rather than end-of-pipe treatment) it is possible to minimise construction depths, reduce<br />

pipe diameters and minimise construction risks. The requirements for rainwater harvesting can<br />

easily be integrated in the <strong>SEL</strong> Source Control System.<br />

Runoff from access roads, car parks, service yards and adjacent footpath areas would be<br />

collected by Permachannels and diffused into a layer of Sudsagg sub-base structural voided stone<br />

using Permavoid biomat conduits. The Permavoid biomat conduits can be 150mm and 300mm<br />

deep to suit site requirements and therefore allow the depth of construction to be shallow as<br />

possible.<br />

The Permavoid biomat conduits would be located within the pavement construction and sit within a<br />

layer of SudsAgg sub-base (min 30% void ratio) into which the received surface water can diffuse<br />

to provide the balance of attenuation. The runoff would attenuate within the SudsAgg sub-base<br />

due to the downstream flow controls and then later be released back into the Permavoid biomat<br />

conduits and onwards until discharged from site. Half empty time is 24hrs in accordance with<br />

current guidance.<br />

The proposed use of the Permachannel and Permavoid biomat source control silt/oil separation<br />

systems ensures the water-quality aspect of the design is very robust and silt/oil loading<br />

calculations are provided as part of the design to demonstrate compliance with PPG3 and CIRIA<br />

guidance.<br />

2<br />

Find out more information at:- www.selel.co.uk


<strong>SEL</strong> Surface Water Solutions<br />

Typical Detail - Permachannel against a kerb<br />

The surface water runoff passes through the<br />

Permachannel where silt and oils are<br />

intercepted, retained and treated. The treated<br />

runoff then passes forward through a Permavoid<br />

biomat diffuser conduit and on into the Sudsagg<br />

sub-base voided stone layer.<br />

<strong>SEL</strong> Permavoid SudsAgg Sub-base System<br />

for <strong>Car</strong> <strong>Park</strong> / Access Road <strong>Drainage</strong><br />

Min. 260mm cover for <strong>Car</strong>s, Vans & Occasional HGV<br />

1. <strong>SEL</strong> Permachannel<br />

2. <strong>SEL</strong> Permachannel Universal Connector<br />

3. Diffuser conduit comprising <strong>SEL</strong> Permavoid and Permafilter<br />

Biomat on 50mm bedding layer<br />

4. <strong>SEL</strong> Selflex Geomembrane protected by Seltex Geotextile (for<br />

attenuation)<br />

5. Surfacing to Engineers Specification<br />

6. Sudsagg sub-base structural voided sub-base<br />

25.000<br />

Runoff<br />

The Sudsagg sub-base has been blended to<br />

provide a nominal 30% void ratio. The surface<br />

water storage capacity of the voided sub-base<br />

layer is affected by the gradient of the finished<br />

surfacing e.g. shallow gradients can offer the<br />

highest storage capacity. Advice on suitable<br />

gradients can be provided for consideration.<br />

1 2 3 4 5 6<br />

<strong>SEL</strong> Environmental Ltd, Canal House, Bonsall Street, Blackburn BB2 4DD<br />

3


T: 01204 885555<br />

System Benefits<br />

Typical Detail - Permachannel in open areas<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

Complete Source Control SUDS solution for new build or retrofit development<br />

Replaces Oil Separators as defined by PPG3 (Pollution Prevention Guidelines)<br />

Six stages of water treatment available within the system<br />

Provides treatment at source by gravity separation and bio-degradation of oils and silts<br />

Provides attenuation or infiltration at source<br />

Replaces sub-base, minimises the requirement for imported aggregate<br />

Shallow construction, minimises residual excavated material<br />

Contributes to BREEAM ratings<br />

Satisfies designers’ risk assessments in accordance with CDM<br />

Reduces the requirement for chambers and pipes<br />

Improves water quality<br />

A practical solution for the retrofit of SUDS components into existing drainage schemes<br />

<strong>SEL</strong> Permavoid® and other system components are manufactured from recycled material<br />

and are also recyclable and reusable<br />

Resistant to frosts, salts and hydrocarbons<br />

<strong>SEL</strong> Permavoid SudsAgg Sub-base System<br />

for <strong>Car</strong> <strong>Park</strong> / Access Road <strong>Drainage</strong><br />

Min. 260mm cover for <strong>Car</strong>s, Vans & Occasional HGV<br />

1. <strong>SEL</strong> Permachannel<br />

2. <strong>SEL</strong> Permachannel Universal Connector<br />

3. Diffuser conduit comprising <strong>SEL</strong> Permavoid and Permafilter Biomat on 50mm<br />

bedding layer<br />

4. <strong>SEL</strong> Selflex Geomembrane protected by Seltex Geotextile (for attenuation)<br />

5. Surfacing to Engineers Specification<br />

6. Sudsagg sub-base structural voided sub-base<br />

25.000<br />

Runoff<br />

24.7<br />

The Sudsagg sub-base has been blended to provide a nominal 30% void ratio. The<br />

surface water storage capacity of the voided sub-base layer is affected by the<br />

gradient of the finished surfacing e.g. shallow gradients can offer the highest<br />

storage capacity. . Advice on suitable gradients can be provided for consideration.<br />

1<br />

4<br />

Find out more information at:- www.selel.co.uk


T: 01204 885555<br />

The surface water runoff passes through the<br />

Permachannel where silt and oils are<br />

intercepted, retained and treated. The treated<br />

runoff then passes forward through a Permavoid<br />

biomat diffuser conduit and on into the Sudsagg<br />

sub-base voided stone layer.<br />

25.000<br />

<strong>SEL</strong> Support Sevices<br />

<strong>SEL</strong> are pleased to offer the following<br />

services in support of the <strong>SEL</strong> <strong>Car</strong><br />

<strong>Park</strong> <strong>Drainage</strong> System:-<br />

<br />

<br />

<br />

<br />

<br />

<br />

<strong>Drainage</strong> review<br />

Design and specification service<br />

Scheme budget costings<br />

On-site technical support<br />

Installation Teams for specialist<br />

elements<br />

Complete integrated surface water<br />

management solutions<br />

50<br />

Runoff<br />

2 3 4 5 6<br />

<strong>SEL</strong> <strong>Car</strong> <strong>Park</strong> <strong>Drainage</strong> System under installation<br />

<strong>SEL</strong> Environmental Ltd, Canal House, Bonsall Street, Blackburn BB2 4DD<br />

5


<strong>SEL</strong> Surface Water Solutions<br />

Why Choose the <strong>SEL</strong> <strong>Car</strong> <strong>Park</strong> <strong>Drainage</strong> System?<br />

Innovative Source Control Solution for <strong>Car</strong> <strong>Park</strong> <strong>Drainage</strong><br />

The <strong>SEL</strong> <strong>Car</strong> <strong>Park</strong> System provides a solution for the management of surface water runoff<br />

from car park and access road hard surfacings. The system comprises a series of treatment<br />

phases which have been specifically developed to provide the ideal source control solution<br />

to meet the requirements of all current guidelines and legislation relating to SUDS, whilst<br />

incorporating traditional impermeable surfacings such as macadam, asphalt, concrete and<br />

standard block paving.<br />

Reduced <strong>Drainage</strong> Works<br />

Employing the <strong>SEL</strong> Source Control System in this manner can lead to a reduction is the<br />

length and diameter of drainage pipework required, quantity and size of chambers, remove<br />

the need for a petrol interceptor and a dramatic reduction in the amount of earthworks<br />

required on site<br />

Design Flexibility<br />

The system is particularly beneficial where specific problems exist, such as high water<br />

tables, contamination, or poor ground conditions (i.e. low CBR).<br />

CDM<br />

The <strong>SEL</strong> <strong>Car</strong> <strong>Park</strong> System satisfies the designers’ statutory obligations as required by the<br />

Construction Design and Management (CDM) regulations. The risks inherent with traditional<br />

drainage systems are:<br />

• Operatives working in deep excavations where there is risk of collapse<br />

• Heavy lifting operations<br />

• Operatives working within confined spaces<br />

• Operatives exposure to contaminated sub-strata<br />

The <strong>SEL</strong> Source Control System avoids these foreseeable risks because it is shallow<br />

(generally less than 500mm deep), lightweight, installed above formation levels and<br />

contaminated zones.<br />

Permachannel link to diffuser conduit<br />

Oils are collected in the Permachannel<br />

<strong>SEL</strong> Flow Control Chambers<br />

<strong>SEL</strong> design and manufacture a range of<br />

plastic drainage chambers for sustainable<br />

drainage systems. A range of chambers in<br />

varying depths and diameters are<br />

available to suit your site requirements<br />

whether they are for flow control, silt<br />

interception or debris screening from<br />

downpipes.<br />

<strong>SEL</strong> have developed a standardised flow<br />

control chamber for incorporation into the<br />

<strong>SEL</strong> <strong>Car</strong> <strong>Park</strong> <strong>Drainage</strong> System. The<br />

chamber has an integral orifice flow<br />

control device which is protected by a<br />

filter screen. The filter screen is removable<br />

for maintenance and the orifice sizes are<br />

sized to suit the specific outflow<br />

requirements for the site.<br />

The chamber has a high level inlet from<br />

the Sudsagg sub-base storage layer and a<br />

low level outlet which allows for the<br />

outgoing drainage pipework to be installed<br />

at shallow depths directly below the<br />

formation level. This transition allows for<br />

the drainage pipework to be installed in<br />

advance of the Sudsagg sub-base storage<br />

layer and prevent disruption to following<br />

trades and programmed construction<br />

activities.<br />

6<br />

Find out more information at:- www.selel.co.uk


<strong>SEL</strong> Surface Water Solutions<br />

Typical Detail - Flow Control Chamber from Permavoid Conduit<br />

<strong>SEL</strong> Permavoid SudsAgg Sub-base System<br />

for <strong>Car</strong> <strong>Park</strong> / Access Road <strong>Drainage</strong><br />

Min. 260mm cover for <strong>Car</strong>s, Vans & Occasional HGV<br />

1. <strong>SEL</strong> flow control chamber<br />

2. Surfacing to Engineers Specification<br />

3. <strong>SEL</strong> Selflex Geomembrane protected by Seltex Geotextile (for attenuation)<br />

4. Diffuser conduit comprising <strong>SEL</strong> Permavoid and Permafilter Biomat on 50mm<br />

bedding layer<br />

5. Sudsagg sub-base structural voided sub-base<br />

The <strong>SEL</strong> flow control chamber has a removable<br />

filter screen which protects the orifice outlet. The<br />

screen can be removed and cleaned as part of<br />

the site maintenance regime.<br />

1 2 3 4 5<br />

355 mm<br />

760 mm<br />

160 mm<br />

Rodding Access Point<br />

Removable Filter <strong>Car</strong>tridge<br />

200 mm<br />

Orifice Outlet<br />

150mm Concrete surround<br />

600.00 mm<br />

<strong>SEL</strong> Environmental Ltd, Canal House, Bonsall Street, Blackburn BB2 4DD<br />

7


Contact Information<br />

Telephone: +44(0)1254 589987<br />

Email: sales@selenvironmental.com<br />

Other Services<br />

Web: www.selel.co.uk<br />

Technical Services<br />

To support architects, engineers and contractors in designing and installing the<br />

<strong>SEL</strong> <strong>Car</strong> <strong>Park</strong> <strong>Drainage</strong> System our design services department offers<br />

Sustainable <strong>Drainage</strong><br />

Solutions for Housing<br />

Rooftop Sport Facilities<br />

Membrane Installation<br />

computer aided scheme details and advice on installation.<br />

Supply and install packages are available for elements of the system -<br />

information available on request.<br />

<strong>SEL</strong> reserves the right to change or modify the design of products and<br />

specifications as their policy is one of continued research and improvement.<br />

Attenuation Tanks<br />

Remote Water<br />

Management<br />

Gas Protection to<br />

Buildings<br />

The information contained in this publication is believed to be correct at the date<br />

of publication, but it should be understood that between publications there may<br />

be changes in pertinent standards or regulations affecting the accuracy of the<br />

information contained therein.<br />

All information in this document is courtesy and Copyright of <strong>SEL</strong> Environmental<br />

Ltd © 2013. Several of the products shown in this brochure are subject to patent<br />

and/or registered design - please contact <strong>SEL</strong> for further details.<br />

<strong>SEL</strong> Environmental Ltd, Canal House, Bonsall Street, Blackburn BB2 4DD

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