Infiltration and Attenuation Systems Product and Installation Guide

Transcription

1 Uniclass JR12/JS10 L731/L71121/L2123 CI/SfB (52.5) (90.51) May 2009/rev February 2010 WM424 EPIC J3413 X721 Intelligent stormwater solutions by Wavin Infiltration and Attenuation Systems Product and Installation Guide For residential, commercial, industrial and infrastructure applications

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3 Contents Infiltration and Attenuation Introduction 4-5 Intesio - For Optimum Stormwater Management 4 AquaCell Systems 4 Garastor System 5 Overview 6-7 Overview of AquaCell Systems 6-7 Applications 8-11 AquaCell Plus for Deeper installations 8-9 AquaCell Core for Trafficked installations 10 AquaCell Lite for Landscaped and Non-Trafficked Sites 11 AquaCell Systems Principal Components 12 Ancillary Components 12 System Selector 13 Design and Installation Design and Installation Guidance Typical Soakaway Installation Method 16 Typical Storage Tank Installation Method 17 Silt Trap 18 Air Vent Design 18 Typical Connections Typical Connections to AquaCell Units 19 Typical Air Vent Connections 20 Typical Connection Configurations 21 Typical Details Soakaway - Non-Traffic Loading 22 Soakaway - Highway 23 On-Line Storage - Box Feed 24 On-Line Storage - Manifold Feed 25 On-Line Storage - Central Pipe Feed 26 On-Line Storage - Manifold Feed with Bypass 27 Off-Line Storage - Box Feed 28 Off-Line Storage - Manifold Feed 29 Off-Line Storage - Central Pipe Feed 30 Soakaway or Storage Tank - With Silt Trap 31 Garastor System Introduction 32 Overview 33 Principal Components 34 Typical Installation Methods 35 Wavin operates a programme of continual product development, and therefore reserves the right to modify or amend the specifi cation of their products without notice. All information in this publication is given in good faith, and believed to be correct at the time of going to press. However, no responsibility can be accepted for any errors, omissions or incorrect assumptions. Users should satisfy themselves that products are suitable for the purpose and application intended. Page 3

4 Infiltration & Attenuation Systems Introduction Intesio for optimum stormwater management Continuing urban development, a changing climate and the consequences of intensified rainfall: all are increasingly prominent issues on the political and environmental agenda. In combination, they represent a complex need for the most intelligent, effective solution. Intesio is Wavin s specialist approach to responsible management of stormwater, including its efficient capture, transportation, cleansing, infiltration, attenuation and re-use. We re ready to contribute at any stage in a project, with one central goal: to help achieve the optimum project outcome. Our in-depth expertise, design insight and proven system technology is applied wherever required to ensure each installed scheme achieves maximum efficiency of cost and integrated function, and full compliance with the latest regulatory criteria. AquaCell Plus Intesio AquaCell systems: The AquaCell systems are a fully tried and tested modular technique for managing excessive rainfall by creating an underground structure as either a temporary storage tank or a soakaway: AquaCell Plus (light blue unit) inspectable, for use in deep trafficked locations. AquaCell Core (blue unit) for trafficked locations. AquaCell Lite (green unit) for landscaped and non-trafficked sites. Box systems select with care Rising rainfall levels, and increased focus on SUDS compliance, have led to a sharp increase in the use of modular box systems to create underground structures for infiltration or temporary storage of stormwater. AquaCell Core However, not all currently available systems have the proven performance characteristics necessary for the wide range of complex underground geocellular applications (see pages 8, 9, 10 & 11). With Intesio AquaCell systems, however, the required strength and hydraulic capabilities have been verified by independent testing. AquaCell Lite Page 4 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

5 Infiltration & Attenuation Systems Introduction Garastor System* A polypropylene control chamber connected to a water storage reservoir EITHER made up of AquaCell units or located in a void beneath the garage of individual houses. * Depending on the application either AquaCell Core or AquaCell Lite may be used in conjunction with Garastor. For further details contact Wavin Technical Design. Note: Garastor can be used as a control device for any AquaCell storage system, no greater than one unit deep with a discharge of up to 1.4 l/s via the 30mm release orifice. * Garastor is manufactured under licence (Patent Number GB ). The AquaCell Stormwater Management System Comprises individual infiltration modules assembled together to form underground structures which can either be used for stormwater storage or as an alternative to domestic soakaways. Heavy storms and major cloudbursts are becoming more frequent, resulting in ever increasing volumes of stormwater ing into conventional drainage systems and water courses. When the capacities of these systems are exceeded the consequences can be dramatic and damaging. Stormwater must be controlled; either by limiting the out and providing temporary storage or where the ground conditions are suitable, providing soakaways for the stormwater to infiltrate back into the surrounding ground. This has the added benefit of recharging the local groundwater. Both options can be achieved using either the AquaCell Plus, Core or Lite systems depending on the application. Garastor System AquaCell Lite soakaway Large scale AquaCell Core storage tank Garastor domestic storage using AquaCell Core tank Domestic AquaCell Core soakaway Garastor domestic storage using garage void Page 5

6 Overview of AquaCell Systems AquaCell systems are a fully tried and tested modular technique for managing excessive rainfall. Units are assembled to create an underground structure as either temporary storage tank or soakaway. There are 3 types of unit: AquaCell Plus for extra deep installations and/or inspectability (pages 8-9) AquaCell Core for trafficked locations (page 10), and AquaCell Lite Types of Connections There are a number of ways to provide a controlled feed into the AquaCell units to suit the required capacity. These being: 1. Manifold Configuration this configuration utilizes standard pipe and fittings (see page 21) 2. Box Configuration this configuration utilizes the AquaCell Core units (see page 21) 3. Central Pipe Configuration this configuration utilizes standard perferated TwinWall pipe and fittings (see page 21) for landscaped and non-trafficked locations (page 11) For quick, versatile assembly The lightweight polypropylene, high void units are securely linked together using special clips and shear connectors. They can be assembled quickly on site into whatever configuration suits each specific location. AquaCell Core and Lite geocellular systems also allow brickbonding, which can give extra stability, without the need for additional connector pieces. Wrapped for infiltration or storage The complete assembly is wrapped in either geotextile sheet or a geomembrane: For pervious soils, the geotextile option allows infiltration of stormwater into the surrounding ground. For impervious ground (e.g. clay) or where infiltration is not desirable, the geomembrane holds stormwater in temporary storage until local drainage s can accept it for normal disposal. Benefiting community and environment AquaCell systems contribute the following benefits: Significantly reduced flooding risk Controlled, reduced-volume release of stormwater into existing sewer systems or watercourses Recharging of local groundwater (if infiltration/soakaway application) Aerobic purification to improve water run-off quality Sustainable, cost effective management of the water environment Helping SUDS and planning approval The proven qualities and performance of AquaCell systems not only support the achievement of SUDS, they can also help reinforce and enhance planning applications, and enable development to proceed. Page 6 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

7 Overview of AquaCell Systems Acceptance British Board of Agrément The Intesio Infiltration and Attenuation systems, AquaCell Plus, Core and Lite have been awarded British Board of Agrément approval under BBA Agrément Certificate No.03/4018. The certificate covers the design data, technical specification, installation and maintenance aspects for each unit as follows: AquaCell Core approved under BBA Agrément Certificate No.03/4018, Detail Sheet 1 AquaCell Lite approved under BBA Agrément Certificate No.03/4018, Detail Sheet 2 AquaCell Plus approved under BBA Agrément Certificate No.03/4018, Detail Sheet 3 Construction Industry Research and Information Association (CIRIA) CIRIA publishes structural design information for modular geocellular drainage tanks CIRIA has produced Guidance Document C680 Structural design of modular geocellular drainage tanks... This document has been produced to ensure that engineers have the required information to establish that a proposed underground structure is capable of remaining structurally sound and operational in trafficked situations over the lifetime of the construction. C680 asserts that engineers should satisfy themselves of the suitability of the proposed construction, and not rely on manufacturer s recommendations. Intesio AquaCell has been fully tested in accordance with the requirements of C680 and we can, if required, provide structural calculations for our system within our designs from an independent consultant. Page 7

8 AquaCell Plus for Deeper Installations and/or for Inspectability For any installation where extra depth and/or inspectability is required. Extra deep installations AquaCell Plus has been developed and engineered to add extra design scope for AquaCell installations. The units can be used in combination with AquaCell Core (and with Lite if there is at least one layer of AquaCell Core in between the Plus and Lite Layer). Extra lateral loading capacity allows installation at greater depths. Integral inspection channels in each unit can combine to create viewing channels for the full length of the installed structure. PROVEN LOADING CAPACITY Vertical: 65 tonnes/m2 Lateral: 8.55 tonnes/m2 INSTALLATION DEPTH Non-trafficked areas Maximum to base of units*: 5.08 metres *in best soil conditions OTHER FEATURES Specific to AquaCell Plus: Distinctive LIGHT BLUE colour for ease of inspectability Integral inspection tunnel Approvals: BBA No.03/4018 Detail Sheet 3 AquaCell Plus: solus or in combination AquaCell Plus may be used on its own or in combination with AquaCell Lite* and/or AquaCell Core. *AquaCell Lite can only be used in conjunction with AquaCell Plus, if there is at least one layer of AquaCell Core inbetween the Plus and Lite layer. Trafficked areas AquaCell Plus 6LB200 End cap for when an inspection channel is not required Page 8 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

9 AquaCell Plus for Deeper Installations and/or for Inspectability AquaCell Plus: for extra depth and/or inspectability. The extra lateral loading capacity of AquaCell Plus means it can be used at a greater depth (maximum 5.08m). This may be on its own or in combination with AquaCell Core, which has a maximum permitted depth of 4.25m (4.1m if trafficked). Inspectability scenarios AquaCell Plus: for inspectability By aligning AquaCell Plus units end-toend, full length viewing channels can be created allowing for CCTV inspection if required. These are created in the bottom layer of an AquaCell tank installation. AquaCell Plus units may be installed alongside other AquaCell units, as in the examples shown. Wavin recommends that a minimum of three inspection tunnels are created at the inlet point (at or near the tank centre line) and at the two outer edges of the structure. An inspection chamber should be installed for each tunnel. AquaCell Core and AquaCell Plus NOTE: For any AquaCell Plus units on the perimeter of a structure that are NOT required for inspection access, the open ends of the integral inspection tunnels should be fitted with the end caps provided. Inspection chambers An inspection chamber should precede the inlet pipework for the AquaCell structure: For on-line installations: (down to 3m) Intesio Non-Entry Inspection Chamber [NIC] or (down to 5m) Intesio Tegra 600 Inspection Chamber or Traditional manhole* *where inlet pipework is replaced by AquaCell units acting as conduit). Trafficked tank installation with inspection channels A silt trap prior to the inspection chamber is also recommended. For off-line installations: Traditional manhole with in-built control For non-inlet inspection points, use Intesio Non-Entry Inspection Chamber [NIC] or Intesio Tegra 600 Inspection Chamber only. RECOMMENDATION: If installing Intesio Non-Entry Inspection Chamber [NIC] or Intesio Tegra 600 Inspection Chamber, regardless of depth, ensure the cover and frame includes a 350mm restrictor to prevent man entry. Inspection and maintenance CCTV inspection at every inspection point is recommended: after every major storm at regular intervals according to the specific maintenance plan for the site Silt traps prior to inlet pipework should be routinely inspected and cleaned out to minimise debris reaching the tank. It is important to prevent construction silt from entering the AquaCell structure. Page 9

10 AquaCell Core for Trafficked Sites AquaCell Core is ideal for areas subject to regular and heavy traffic loading, and particularly for larger projects. Typical applications Specifiers, developers and contractors can now choose the right product to suit each situation. The original AquaCell Core (blue unit) has already proved its versatility and functional performance advantages in large projects designed to satisfy demanding criteria for sustainable drainage. Examples of projects utilising AquaCell include: Large scale 7,000 unit soakaway under airport car park 2,000 unit storage tank in contaminated land, a former power station site 1,400 unit storage tank to store run-off from expanding retail park Industrial/commercial areas In locations where traffic loading is NOT anticipated, AquaCell Lite (green unit) should be selected (see page 11). In addition to features and benefits applicable to BOTH systems those specifically applicable to traffickable AquaCell Core (blue unit) include: BBA approved and can meet technical requirements of NHBC Proven vertical loading capacity: 56 tonnes/m2 Proven lateral loading capacity: 7.75 tonnes/m2 For installations both up to and exceeding 1.5 metres deep Distinctive BLUE colour easy to identify Residential developments Designed for all configurations and applications, including both shallow and deeper installations Ideal for all sizes of project including major attenuation schemes Roads AquaCell Core 6LB100 Car parks Page 10 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

11 AquaCell Lite for Landscaped and Non-trafficked Sites AquaCell Lite has been designed and developed for landscaped and other traffic-free areas where heavy loading capability is not required. Typical applications This now enables specifiers, developers and contractors to choose the right product to suit each situation. AquaCell Lite (green unit) offers all the proven installation versatility and functional performance advantages of AquaCell Core (see page 10), but has been specifically engineered to provide a cost-effective option for low-loaded locations. In addition to features and benefits applicable to BOTH systems those specifically applicable to AquaCell Lite (green unit) include: Proven vertical loading capacity: 17.5 tonnes/m2 Proven lateral loading capacity: 4.0 tonnes/m2 Domestic gardens For installation depth (to base of units) of up to 1.5 metres maximum Built-in hand holes for easy carrying/handling Distinctive GREEN colour easy to identify Specifically designed for restricted depth, low-loaded, landscaped sites: Ideal for smaller projects Note: NOT suitable for locations subject to high watertable. Grassed and leisure areas Roundabouts AquaCell Lite 6LB050 Domestic back gardens Page 11

12 AquaCell Systems Principal Components Principal Components AquaCell Lite Unit 6LB050 AquaCell Core Unit 6LB100 AquaCell Plus Unit 6LB200 Note: All AquaCell units (Lite, Core and Plus) have identical dimensions: 1m (L) x 0.4m (H) x 0.5m (W) Ancillary Components 6LB105 Clip (Used to hold units together 6UR141 6TW141 6D099 6LB102 horizontally) UltraRib S/S Adaptor TwinWall S/S Adaptor OsmaDrain S/S Reducer Shear Connector (Fits into pre-formed socket (Fits into pre-formed socket to 160mm x 110mm (fits into (Used to hold units to connect to 150mm connect to 150mm TwinWall) pre-formed socket to connect together vertically) UltraRib) to 110mm OsmaDrain) 4D916 6D mm OsmaDrain OsmaDrain S/S Adaptor P/E Adaptor Thinwall Clay Spigot (Fits into pre-formed socket (For use with 6D916 when as an extension connection connecting to a BS EN 295 piece) Thinwall Clay Spigot) All ancillary components can be used with either the AquaCell Lite, Core or Plus units, except the 225mm Flange Adaptor (6LB106) which must only be used with AquaCell Plus or Core. 6LB104* 150mm Flange Adaptor (Adaptor to be used at points other than pre-formed socket to connect to 150mm UltraRib) 6LB106** 225mm Flange Adaptor (To connect to 225mm UltraRib) * 6LB104 Can only be used when constructing an air vent, on the top surface of the unit, when installed with AquaCell Lite (6LB050) ** 6LB106 Not suitable for use with AquaCell Lite (6LB050) 6LB600 Silt Trap (Use Extension Kit if required) The 150mm Flange Adaptor (6LB104) should only be used when constructing an air vent on the top surface of an AquaCell Lite unit. The adaptor should not be used to connect inlet pipes to the side of the AquaCell Lite unit. 6SC205 Extension Kit Note : All components on this page are not shown to scale Page 12 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

13 AquaCell Systems System Selector The following selector will help you to determine which AquaCell system, or combination of systems, is the correct choice for a particular project. Will the site be subject to traffic loading? NO YES Does the site have a high water table? NO YES Will both tank length and width be more than 12m? NO YES Will the tank be more than 1.5m deep? NO YES Will the tank be more than 4.25m deep? Will the tank need to be installed extra deep (ie deeper than 4.1m in ideal soil conditions)? NO YES NO YES Use: Lite up to 1.5m Use combination of: Use combination of: Lite up to 1.5m Lite up to 1.5m Core up to 4.25m Core up to 4.25m Use: Core up to 4.1m Use combination of: Core up to 4.1m Plus up to 4.78m Plus up to 5.08m Lite AquaCell Lite (6LB050) See pages 6 and 7 Core AquaCell Core (6LB100) See pages 8 and 9 Plus AquaCell Plus (6LB200) See pages 10 and 11 Notes: AquaCell Lite and AquaCell Plus cannot be used directly together. If the tanks need to be inspectable contact Wavin Technical Design on Page 13

14 Design and Installation Guidance Hydraulic and Structural Design All AquaCell system units have identical dimensions: 1m x 0.4m x 0.5m, with a nominal void ratio of 95%. Hydraulic calculations are accordingly the same for AquaCell Core, Lite and Plus. Structural design, however, requires careful consideration of loading factors specific to each location. Minimum cover depth AquaCell AquaCell AquaCell Location type Lite Core Plus Landscaped/non-trafficked areas 0.3m b 0.5m 0.5m Car parks, vehicle up to 2500 kg a gross mass, with AquaCell system up to 3 AquaCell units wide in trench n/a 0.6m 0.6m more than 3 AquaCell units wide n/a 0.75m 0.75m Maximum depth to base of unit 1.5m 4.25m c 5.08m a For specific advice on cover depths for heavier loadings/hgv applications, contact Wavin Technical Design on b 0.3 is minimum depth for AquaCell Lite, although 0.5m cover is recommended to prevent accidental damage. If construction plant is to be used on site, extra protection may be needed. c Allowable maximum depth to base of bottom layer of units is dependent on soil type, angle of shearing resistance, loadings, and groundwater level. In poor ground conditions a shallower depth may apply. Installation and Cover Depths After deciding which AquaCell system is correct for the project location (using the Product Selector on page 13), see AquaCell Systems: Installation Depths Each AquaCell system has been designed to have specific loading capacities (see pages 8, 9, 10 & 11) that define the trafficking by motor vehicles/ HGVs. In each case, the cover depths shown in the diagram include both absolute minimum and recommended minimum cover depths. Deep-running drainage network Other buried services running above tank location Installation into banked/ sloping ground Table for the recommended maximum installation depths and minimum cover depths. The Mixing the units together diagram also shows the depth depth parameters for which they are suitable. Minimum depth of cover varies according to whether or not the installation will be subject to In some situations, installations have to be located at much deeper levels with significantly greater cover depths. Reasons may include: Upper layer of clay preventing infiltration parameters for each system, and so gives guidance on combining two or more of the Landscaped installation Trafficked installation AquaCell systems m minimum cover depth m minimum cover depth 1.5m 4.25m 5.08m 4.1m 4.78m Lite Core Plus Mixing the units together Page 14 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

15 Design and Installation Guidance Geocellular Structures Important design considerations To guarantee the structural integrity of an engineered drainage system, any underground structure must be strong enough to support the loads to which it will be subjected without any unacceptable deflection. The correct choice of geocellular box must have appropriate proven top (vertical) and side (lateral) load bearing capacity and deflection characteristics to suit site conditions. The five key site considerations to be noted when designing a geocellular box system are: AquaCell Lite: Additional Installation Guidance Because of the special physical properties of AquaCell Lite, certain precautions are recommended on site to prevent damage to the units through excess loading. Manual assembly Whilst assembling the tank, it may be necessary to walk on top of previously laid AquaCell units. Therefore care should be taken not to damage the edges of the units. Construction traffic on site If construction plant (e.g. excavators or loaders) are likely to run over the installation: Depth of cover (See page 14) Soil type Surface finishing Presence of groundwater Type of traffic/loading MINIMUM protective cover should be 500mm well-compacted granular material Excavators MUST NOT weigh more than 14 tonnes, and compaction plant must not exceed 2300 kg per metre width HGVs MUST NOT run over installed AquaCell Lite units Backfilling When backfilling AquaCell Lite installations: Machines placing the material must be located OFF the units Only light compaction should be applied to the material 5 If Type 1 sub-base (or similar) material over AquaCell Lite units requires compaction: First layer should be 300mm thick before any compaction NO vibratory mechanism should be used for compacting this first layer MAXIMUM roller size: 2300 kg per metre width 4 The combination of these 5 factors effectively means that the required characteristics of a geocellular system to be installed under a trafficked location (for example) will be very different from that under a landscaped/low-loaded location. Two typical examples are given below. EXAMPLE A: EXAMPLE B: Landscaped/ Car park with occasional non-trafficked location lorry traffic and 0.6m cover and 0.3m cover depth. depth. Typically requires Typically requires minimum minimum vertical strength vertical strength of 17.5 of 40 tonnes/m 2 tonnes/m 2 Ancillaries and Adaptors All ancillaries and adaptors (see page 12) can be used with either the AquaCell Plus, Core or Lite units, except the 225mm Flange Adaptor (6LB106) which must only be used with AquaCell Plus/ Core. The 150mm Flange Adaptor (6LB104) should only be used when constructing an air vent on the top surface of an AquaCell Lite unit. The adaptor should not be used to connect inlet pipes to the side of the AquaCell Lite unit. These factors have already been taken into consideration within the product selector on page 14 for the 3 AquaCell systems. Page 15

16 Typical Soakaway Installation Method AquaCell Plus/AquaCell Core/AquaCell Lite Units 100mm Permeable geotextile* Pre-formed socket 100mm Coarse sand or non angular granular material base and surround 100mm Example shows the use of AquaCell Lite. However a soakaway can also be installed as shown using AquaCell Plus or Core as appropriate. * The geotextile should be selected according to specific site conditions. Typically, however, a 300g material will be suitable. Specialist advice should be sought if surrounding soil characteristics exhibit a high degree of fines/low infiltration capacity and/ or there is a high risk of damage from ground contaminants. Typical Installation Procdedure 1. Excavate the trench to the required depth ensuring that the plan area is slightly greater than that of the AquaCell units. 2. Lay 100mm bed of coarse sand or non angular granular material, level and compact. 3. Lay the geotextile* over the base and up the sides of the trench. 4. Lay the AquaCell units parallel with each other. In multiple layer applications, wherever possible, continuous vertical joints should be avoided. AquaCell units can be laid in a brick bonded formation (i.e. to overlap the joints below). For single layer applications use the AquaCell Clips and for multi layers use the AquaCell Clips and the AquaCell Shear Connectors. 5. Fix the Adaptors to the AquaCell units as required and connect pipework. 6. In order to prevent silt from entering the tank, clogging inlet pipework and reducing storage capacity, it is recommended that the Silt Trap (6LB600) is installed prior to the inlet pipework - see page 18 for installation guidelines. 7. Wrap and overlap the geotextile covering the entire AquaCell structure. 8. Lay 100mm of coarse sand or non angular granular material between the trench walls and the AquaCell structure and compact. 9. Lay 100mm of coarse sand or non angular granular material over the geotextile and compact. Backfill with stone free as-dug material. 10. Rainwater from roof areas may discharge directly into the soakaway but rainwater from carparks must discharge through a catchpit manhole or a petrol interceptor. Page 16 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

17 Typical Storage Tank Installation Method AquaCell Core/AquaCell Lite/AquaCell Plus Units 100mm Suitable impermeable geomembrane Suitable protective geotextile layer Pre-formed socket 100mm Coarse sand or non angular granular material base and surround 100mm Example shows the use of AquaCell Core, however a storage tank can also be installed as shown using AquaCell Plus or Lite as appropiate. * For large scale, deep installations a 1mm thick geomembrane is recommended and joints should be sealed using proprietary welding techniques. However, for shallow, domestic installations it may be suitable to use a geomembrane with taped joints. For further details contact Wavin Technical Design. Typical Installation Procedure 1. Excavate the trench to the required depth ensuring that the plan area is slightly greater than that of the AquaCell units. 2. Lay 100mm bed of coarse sand, level and compact. 3. Lay the geotextile over the base and up the sides of the trench. 4. Lay the geomembrane on top of the geotextile over the base and up the sides of the trench. 5. Lay the AquaCell units parallel with each other. In multiple layer applications, wherever possible, continuous vertical joints should be avoided. AquaCell units can be laid in a brick bonded formation (i.e. to overlap the joints below). For single layer applications use the AquaCell Clips and for multi layers use the AquaCell Clips and the AquaCell Shear Connectors (vertical rods). 6. Wrap the geomembrane around the AquaCell structure and seal to manufacturers recommendations.* 7. If side connections into the AquaCell units is required, (other than the preformed socket), use the appropiate Flange Adaptor (6LB104 or 6LB105). Fix the flange adaptor to the unit using self-tapping screws. Drill a hole through the Flange Adaptor and connect the pipework. 8. In order to prevent silt from entering the tank, clogging inlet pipework and reducing storage capacity, it is recommended that the Silt Trap (6LB600) is installed prior to the inlet pipework see page 18 for installation guidelines. 9. Wrap and overlap the geotextile covering the entire AquaCell structure, to protect the geomembrane. 10. Lay 100mm of coarse sand between the trench walls and the AquaCell units and compact. 11. Lay 100mm bed of coarse sand over the geotextile and compact. Backfill with stone free as-dug material. NB: A storage tank must be vented, and it is recommended that one vent pipe, 110mm in diameter is provided per 7,500 square metres of impermeable catchment area on a site, see page 18 for design. Page 17

18 Typical Installation: Silt Trap and Air Vent Termination Silt Trap 150mm side fill as dug material with no particle sizes larger than 40mm SHAFT 500mm 100mm bed as per pipe bedding specification COVER & FRAME 450mm 1250mm 160mm OsmaDrain Inlet/Outlets or use the appropriate adaptor Typical installation procedure 1. Place the Silt Trap (6LB600) on a minimum of 100mm bed as per pipe bedding specification. Ensure that the unit is as close to the AquaCell system as possible and in a suitable position to allow pipework connection. 2. Connect the relevant pipework in accordance with standard pipe installation guidelines. 3. Surround the sides of the Silt Trap with 150mm of as dug material, with no particle sizes larger than 40mm. 4. Fit relevant cover and frame. Notes: When surrounded by a concrete plinth (150mm x 150mm) the cover can be used in situations with a loading of up to 30kN (3 tonnes) i.e domestic driveways. The silt trap can be extended (if required) using the 500mm Extension Kit (see details on page 34) in conjunction with a 500mm shaft of TwinWall cut to suit. Typical Air Vent Design Balloon Grafting Ventilation Box Flange Connector (6LB104) 110mm OsmaDrain Pipe Geomembrane sealed to Flange 150mm x 110mm Reducer (6UR099) Aquacell Plus/Core/Lite Units Note: It is recommended that one vent pipe, 110mm in diameter, is provided per 7,500 square meters of impermeable catchment area on a site. Please contact Wavin Technical Design for further details. Page 18 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

19 Typical Connections to AquaCell Units Note: It is recommended that all connections and air vent installations in storage applications (using geomembrane) are made using a Flange Adaptor. Adhesive or double sided tape should be used between the geomembrane and the fl ange plate to ensure a watertight seal. Connection for soakaway application using either the pre-formed socket (as shown below) or standard adaptors into pre-formed socket* Permeable Geotextile Wrap Jubilee clip AquaCell Plus AquaCell Core AquaCell Lite Coarse Sand or Non-Angular Granular Material Base and Surround 150mm pipework to suit *Note: For pipework other than 160mm OsmaDrain, these adaptors can be used to connect to the following: 6TW141: TwinWall S/S Adaptor connects to 150mm TwinWall 6D099: OsmaDrain Adaptor connects to 110mm OsmaDrain 4D916: OsmaDrain PE Adaptor connects to 160mm OsmaDrain 6UR141: UltraRib S/S Adaptor connects to 150mm UltraRib 6D128: OsmaDrain S/S Adaptor connects to 150mm thinwall clay. (needs to be used in association with 4D916 Adaptor) Connection for storage application using Flange Adaptor at points other than pre-formed socket, (for AquaCell Plus/Core only). Geomembrane Wrap Flange Adaptor (6LB104/6LB16) Installation Procedure: 1. Fix Flange Adaptor to the AquaCell unit with self tapping screws. AquaCell Plus/ Core Only 2. Drill or cut through the geomembrane and AquaCell unit using either a Crown Drill Bit Cutter or similar. 3. Insert pipework into Flange Adaptor. Coarse Sand or Non-Angular Granular Material Base and Surround 150mm pipework to suit Note: AquaCell Lite is not suitable for side connection using a Flange Adaptor. Page 19

20 Typical Air Vent Connections Top Connection for Air Vent Connect into the top of the AquaCell unit, using Flange Adaptor. Connect suitable pipework to form air vent Flange Adaptor (6LB104) Geomembrane wrap Typical installation procedure: 1. Fix Flange Adaptor to the AquaCell tank with self-tapping screws. 2. Drill through geomembrane and AquaCell unit with a long 150mm Crown Drill Bit Cutter. 3. Insert pipework into Flange Adaptor to form air vent. AquaCell Plus AquaCell Core AquaCell Lite Coarse sand or non angular granular material base and surround Side Connection for Air Vent Connect into the side of the AquaCell tank unit using standard OsmaDrain Reducer (6D099). Jubilee clip Suitable bend and pipework to form air vent Geomembrane wrap AquaCell Plus AquaCell Core AquaCell Lite Coarse sand or non angular granular material base and surround OsmaDrain S/S reducer (6D099) Typical installation procedure: 1. Fix OsmaDrain Reducer to the AquaCell tank with self-tapping screws. 2. Drill through geomembrane and AquaCell unit with a long 150mm Crown Drill Bit Cutter. 3. Insert pipework into OsmaDrain Reducer to form air vent. Page 20 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

21 Typical Connection Configurations Introduction The connections shown here in schematic form, are the 3 options used to connect AquaCell box unit assemblies to control chambers. They provide a controlled feed into and out of the AquaCell box unit assemblies, and are used for either infiltration or attenuation schemes. Manifold Connection (Using standard pipes and fittings) AquaCell box unit assembly 150mm/225mm UltraRib Pipe Sump Precast concrete chamber sections and cover slab 150mm concrete surround Note: The configuration of pipes in a manifold arrangement will vary to suit site conditions and aniticip[ated stormwater intensity. See pages 25, 27 and 29 for this option in context. Box Connection (Using AquaCell Core units for fast water transfer) AquaCell box unit assembly Pipe Sump Precast concrete chamber sections and cover slab 150mm concrete surround Note: See pages 24 and 28 for this option in context. Central Pipe Connection (Using standard perforated TwinWall pipe and fittings) 14mm - 20mm single size granular bedding / backfill material AquaCell box unit assembly Pipe Sump Precast concrete chamber sections and cover slab 150mm concrete surround Perforated TwinWall pipe Note: See pages 26 and 30 for this option in context. AquaCell box unit assembly Page 21

22 Typical Details: Soakaway - Non-Traffic Loading S S Key S = AquaCell units soakaway (See note 2) Ground level Deep Soakaway Non-traffic load area Min depth* Notes 1. Soakaways should be sited at least 5m away from the building (Ref BS EN 752-4) AquaCell Plus AquaCell Core AquaCell Lite Installation depth* 2. The exact size and shape of the soakaways are to be determined once all the necessary calculations have been produced. * For information regarding cover depths and installation depths, see page 14. Trench Soakaway Non-traffic load area AquaCell Plus AquaCell Core AquaCell Lite Ground level Min depth* Installation depth* Page 22 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

23 Typical Details: Soakaway - Highway Footpath Finished road level For minimum depth of cover contact Wavin 225mm UltraRib 150mm UltraRib To road gully 150mm Concrete surround Silt trap AquaCell Plus and AquaCell Core only Page 23

24 Typical Details: On-Line Storage - Box Feed Typical vent detail Open grating Ventilation box Precast concrete chamber sections and cover slab 150mm concrete surround A Precast concrete chamber sections and cover slab Flow control Sump A Sump Long Section AquaCell unit assembly Coarse sand or non angular granular material base and surround 150mm concrete surround Upstream control chamber AquaCell unit assembly Downstream control chamber Sump Plan Flow control Geomembrane wrap with outer protective geotextile wrap AquaCell Core units Cross Section A-A AquaCell Plus units used as the lower layer What Happens to the? 1. The water level in the upstream control chamber rises. 2. Then, during a storm event, the AquaCell box unit storage assembly quickly fills with water via the box feed connection. 3. After storm event, water s back out of the AquaCell box unit storage assembly, finding its own level, and into the downstream control chamber. 4. The water then s through the vortex control valve. Page 24 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

25 Typical Details: On-Line Storage - Manifold Feed Typical vent detail Open grating Ventilation box Precast concrete chamber sections and cover slab 150mm concrete surround A Precast concrete chamber sections and cover slab Flow control Sump A Sump Long Section AquaCell unit assembly Coarse sand or non angular granular material base and surround 150mm concrete surround AquaCell unit assembly Upstream control chamber Downstream control chamber Sump Plan 3-pipe manifold Flow control Geomembrane wrap with outer protective geotextile wrap AquaCell Core units What Happens to the? 1. The water level in the upstream control chamber rises. 2. During a storm event, the AquaCell box unit storage assembly fills with water via the manifold feed connection. 3. After storm event, water s back out of the AquaCell box unit storage assembly, finding its own level, and into the downstream control chamber. 4. The water then s through the vortex control valve. Cross Section A-A AquaCell Plus units used as inspection access Page 25

26 Typical Details: On-Line Storage - Central Pipe Feed Typical vent detail Open grating Ventilation box Precast concrete chamber sections and cover slab 150mm concrete surround A Precast concrete chamber sections and cover slab Flow control Sump A Sump AquaCell unit assembly Wavin TwinWall half-perforated pipe Long Section 150mm concrete surround AquaCell unit assembly Upstream control chamber Downstream control chamber Sump Plan during storm event after storm event Flow control Coarse sand or non angular granular material base and surround 14mm - 20mm single size granular bedding/backfill material Wrap the entire AquaCell unit assemblies with a geotextile wrapping as appropriate Cross Section A-A Geomembrane to perimeter of constructon What Happens to the? 1. The water level in the upstream control chamber rises. 2. AquaCell box unit storage assemblies fill with water via the central pipe connection and percolation through the granular bedding material. 3. After storm event, water s back out of the AquaCell box unit storage assemblies, finding its own level, and into the downstream control chamber. 4. The water then s through the vortex control valve. Page 26 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

27 Typical Details: On-Line Storage - Manifold Feed with Bypass Typical vent detail Open grating Ventilation box Precast concrete chamber sections and cover slab Coarse sand or non angular granular material base and surround Bypass pipe 150mm concrete surround A Precast concrete chamber sections and cover slab Flow control Sump AquaCell unit assembly A Sump Long Section Manifold pipe arrangement Geomembrane wrap with outer protective geotextile wrap 150mm concrete surround Bypass pipe Upstream control chamber Downstream control chamber Sump Plan Flow control AquaCell unit assembly Geomembrane wrap with outer protective geotextile wrap Geomembrane wrap with outer protective geotextile wrap Bypass pipe What Happens to the? 1. When storm conditions are high, the water level in the upstream control chamber rises. 2. The AquaCell tank unit assembly also fills with water to its designated capacity. 3. The excess water is taken up by the bypass pipe and guided to the downstream control chamber, to prevent overloading of the AquaCell tank unit aasembly. 4. As the storm event subsides, the water in the AquaCell tank unit assembly s back out, finding its own level, and also discharges into the downstream control chamber. 5.The water then s through the vortex control valve. Cross Section A-A Page 27

28 Typical Details: Off-Line Storage - Box Feed Typical vent detail Open grating Ventilation box Coarse sand or non angular granular material base and surround 150mm concrete surround A Precast concrete chamber sections and cover slab Weir wall Flow control Long Section A Sump AquaCell unit assembly Geomembrane wrap with outer protective geotextile wrap Non-return flap valve AquaCell unit assembly Flow control Weir wall Plan Geomembrane wrap with outer protective geotextile wrap Precast concrete chamber sections 150mm concrete surround Cross Section A-A What Happens to the? 1. Control chamber fills with water, up to the top of the weir wall. 2. The water overs the weir wall and enters the AquaCell box unit storage assembly via the box connection. 3. AquaCell box unit storage assembly fills with water. 4. After storm event, water s back out of the AquaCell box unit storage assembly, finding its own level, and through the non-return flap valve at the bottom of the weir wall. 5. The water then s through the vortex control valve. Page 28 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

29 Typical Details: Off-Line Storage - Manifold Feed Typical vent detail Open grating Ventilation box Coarse sand or non angular granular material base and surround 150mm concrete surround A Precast concrete chamber sections and cover slab Weir wall Flow control Long Section AquaCell unit assembly Geomembrane wrap with outer protective geotextile wrap A Sump Non-return flap valve AquaCell unit assembly Flow control Weir wall Plan Precast concrete chamber sections 150mm concrete surround Geomembrane wrap with outer protective geotextile wrap What Happens to the? 1. Control chamber fills with water, up to the top of the weir wall. 2. The water overs the weir wall and enters the AquaCell box unit storage assembly via the manifold connection. 3. AquaCell box unit storage assembly fills with water. 4. After storm event, water s back out of the AquaCell box unit storage assembly, finding its own level, and through the non-return flap valve at the bottom of the weir wall. 5. The water then s through the vortex control valve. Cross Section A-A Page 29

30 Typical Details: Off-Line Storage - Central Pipe Feed Typical vent detail Open grating Ventilation box Coarse sand or non angular granular material base and surround A 150mm concrete surround Precast concrete chamber sections and cover slab Weir wall Flow control Long Section A AquaCell unit assembly Wavin TwinWall half-perforated pipe Sump Wavin TwinWall half-perforated pipe 14mm - 20mm single size granular bedding/backfill material Non-return flap valve Flow control Plan during storm event after storm event 14mm - 20mm single size granular bedding/backfill material Wrap the entire AquaCell unit assemblies with a geotextile wrapping as appropriate Cross Section A-A Geomembrane to perimeter of constructon What Happens to the? 1. Control chamber fills with water, up to the top of the weir wall. 2. The water overs the weir wall and enters the AquaCell box unit storage assemblies via the central pipe connection and percolation through the granular bedding material. 3. AquaCell box unit storage assembly fills with water. 4. After storm event, water s back out of the AquaCell box unit storage assemblies, finding its own level, and through the non-return flap valve at the bottom of the weir wall. 5. The water then s through the vortex control valve Page 30 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

31 Typical Details: Soakaway or Storage Tank - With Silt Trap Ground level For minimum depth of cover contact Wavin 160mm OsmaDrain 160mm OsmaDrain Silt trap 160mm OsmaDrain AquaCell Plus AquaCell Core AquaCell Lite (Choice depends on application and site conditions) Notes For bedding specification information refer to page The silt trap can be used in conjunction with a soakaway (as shown) or a storage tank. Page 31

32 Garastor System Introduction Introduction to Garastor* The development of sites results in a large proportion of area being covered by impermeable surfaces such as roofs, car parks and roads. Surface water run-off therefore increases up to 80%. Building Regulations and guidance now requires a sustainable approach to development, which minimises the effects of run-off to that of a greenfield site (20%). Developed in collaboration with Bryant Homes, Garastor (polypropylene control chamber) represents a house by house, rather than a development wide approach, to stormwater management. Garastor controls the of water at source by temporarily storing water under a soft landscaped area using the AquaCell system or in the void space under the floor slab of a residential garage. It eliminates the need for costly, spacehungry, on-site communal water-storage structures or ponds which enables better use of developable land. During high intensity rainfall, water from the roof or hardstanding areas is diverted via the Garastor control unit into the storage void. As the storm subsides the rainwater can be slowly released back into the main drainage system. Note: Garastor can be used as a control device for any AquaCell storage system, no greater than one unit deep with a discharge of up to 1.4 l/s via the 30mm release orifice. Garastor polypropylene control chamber *Garastor is manufactured under licence (Patent Number GB ). Internal view of Garastor Page 32 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

33 Garastor System Overview Garastor System The Garastor unit is a polypropylene chamber that connects to a water storage reservoir. There are two versions of the Garastor available both of which are 500mm in diameter, the 6SC500 version is 1m deep for garage installations (with a 300mm storage depth capacity) and the 6SC501 is 1.25m deep for use with AquaCell* (with a 400mm storage depth capacity). When Garastor is used in conjunction with an AquaCell tank the configuration of units must be no deeper than 1 AquaCell unit. KEY BENEFITS No use of valuable, developable land Safer than open/above ground storage structures Caters for 1 in 150 year storm Spreads cost of water storage over the development period Maintenance free, with no moving parts or filters Run-off reverts to that of a greenfield site If site conditions are such that a deeper Garastor unit is required then the 500mm Extension Kit (6SC205 consisting of a coupler and two ring seals) can be used in conjunction with a shaft of 500mm Twinwall cut to suit, to extend the Garastor unit. *Depending on the application either AquaCell Plus/Core or Lite may be used in conjunction with Garastor. For further details contact Wavin Technical Design. HOW IT WORKS Storm or surface water s through two 110mm diameter incoming pipes. If the is light to moderate, the water is simply stored in the chamber before being slowly released through a 30mm orifice. However, if the in is heavy, excess water in the chamber discharges through a 150mm diameter pipe into the water storage area (either the undercroft of a garage or an AquaCell tank). The water is temporarily stored until the water level inside the chamber has dropped sufficiently, and the water can out to the drainage system via the 110mm out pipe. Inside the Garastor chamber there are specially designed weir walls that ensure that the hydraulics of the unit work to the optimum levels. AquaCell Plus, Core or Lite units Page 33

34 Garastor System Principal Components 500mm diameter 1m (6SC500) 1.25m (6SC501) Garastor 6SC500 (for use with garage undercroft) 6SC501 (for use with AquaCell Core/AquaCell Lite) 150mm TwinWall Socket (for connection to other pipe materials, a small section of 150mm TwinWall is required, alternatively use the 150mm Garastor Connection Kit (6SC200 consisting of a short section of 150mm TwinWall pipe and two ring seals) D/S TwinWall Adaptor (150mm TwinWall socket x 160mm BSEN 1401 socket for connection of 150mm TwinWall pipe to 160mm BSEN 1401 pipe) D/S TwinWall Adaptor (150mm TwinWall socket x 150mm UltraRib socket for connection of 150mm TwinWall pipe to 150mm UltraRib pipe) + 4D920 Cover and Frame 6SC205 Extension Kit Coupler and sealing rings to joint a shaft of 500mm TwinWall pipe S/S TwinWall Adaptor (150mm TwinWall socket x 150mm UltraRib spigot for connection of 150mm TwinWall pipe directly to 150mm UltraRib socket) S/S TwinWall Adaptor (150mm TwinWall socket x 160mm BSEN 1401 spigot for connection of 150mm TwinWall pipe directly into the AquaCell pre-formed socket) Note : All components on this page are not shown to scale Page 34 Customer Services Technical Enquiries Technical Fax technical.design@wavin.co.uk

35 Garastor System Typical Installation Methods 1. Place the Garastor Unit (6SC500 or 6SC501) on a minimum of 100mm as-dug or granular material. Ensure that the unit is as close to the garage undercroft or AquaCell structure as possible and in a suitable position to allow pipework connection. Note: It is important to ensure that the chamber is placed in a level position and that the invert of the 150mm pipe connection is level with the base of the concrete undercroft or the base of the AquaCell units. 2. Connect pipework in accordance with standard pipe installation guidelines. Garastor installation using garage void Bitumastic paint applied to walls of void area and underside of the garage floor 110mm out pipework to drainage system Wall to retain storage area Garastor (6SC500) 150mm out pipework to undercroft/void 110mm in pipework to chamber Stored water 50mm sand layer Rainwater pipe (or air brick) for ventilation 1200g polythene damp proof membrane 75mm thickness of smooth finished concrete Note: The depth of foundations for standard block and beam garage floors will need to be lowered by approx. 300mm to accommodate the storage capacity required. 3. Surround the Garastor unit with 150mm of similar material to that used for the bedding. 4. Fit relevant cover and frame according to depth of unit: Up to and including 1.2m deep 4D943, deeper than 1.2m 6D931. Note: When surrounded by a concrete plinth (150mm x 150mm) the cover can be used in situations with a loading of upto 30Kn (3 tonnes) i.e. domestic driveways. Garastor installation using AquaCell* AquaCell Plus, Core or Lite Suitable impermeable geomembrane 4. Adequate ventilation must be provided: - to the garage undercroft using either air bricks or rainwater downpipes connected directly into the storage area. - to the AquaCell structure using an air vent (NB. One air vent is required per 7,500 square metres of impermeable area to be drained). Garastor (6SC501) Note: When using Garastor with the undercroft/void of a garage, it is the responsibility of the designer to ensure that the enhancement to the garage undercroft/void and drainage works comply with current prevailing Building Regulations. Note: * Depending on the application either AquaCell Core or AquaCell Lite may be used in conjunction with Garastor. For further details contact Wavin Technical Design. Also to prevent softening of the soils below the foundations or loss of fines leading to settlement, the void beneath the garage should be lined as follows: Underneath the concrete base of the void area there should be a 1200g polythene damp proof membrane. Bitumastic paint should be applied to the walls of the void area and to the underside of the reinforced garage floor beams. Page 35

36 Intelligent stormwater solutions by Wavin Intesio working to ensure optimum stormwater management The combination of urban development and intensified rainfall from climate change can create serious problems. Stormwater situations are challenges that may be unavoidable, but they can be very effectively overcome when the right expertise is applied. Intesio is Wavin s specialist focus for the most efficient capture, transportation, cleansing, infiltration, attenuation and re-use of stormwater at source. The Intesio Team has the essential experience and design insight to help engineer the best possible solution, in its widest sense, every time. Our well-proven system technology is intelligently applied to the individual needs of each location and situation. We make thorough checks to ensure efficient performance and full adherence to the latest statutory regulations. By making Intesio part of your project approach, the outcome is assured: the optimum balance of cost, function and compliance. Wavin Limited Parsonage Way Chippenham Wiltshire SN15 5PN Tel: Wavin operates a programme of continuous product development, and therefore reserves the right to modify or amend the specification of their products without notice. All information in this publication is given in good faith, and believed to be correct at the time of going to press. However, no responsibility can be accepted for any errors, omissions or incorrect assumptions. Users should satisfy themselves that products are suitable for the purpose and application intended. WM424 May 2009/rev February 2010 CWD 3000