The SEL Source Control System. Sustainable Drainage (SUDS) Attenuation Infiltration

Transcription

1 The SEL Source Control System Sustainable Drainage (SUDS) Attenuation Infiltration

2 contents What are SUDS? (Sustainable Drainage Systems) 2 Why Source Control? 3 The SEL Source Control System Multi-Stage Treatment System - Attenuation 4-5 SEL Permachannel SEL Permafilter Biomat 6 SEL Permavoid SEL Permafilter Flow Control Chamber 7 SEL Permaceptor, SEL Gullyceptor, Encapsulation for attenuation systems 8-9 The SEL Source Control System Multi-Stage Treatment System - Infiltration 10 SEL Sudstex Permafilter Geotextile 11 Solutions For Roofs Typical Configurations SEL Source Control System Components SEL Source Control System Typical layouts What are SUDS? (Sustainable Drainage Systems) SUDS are techniques for the management of stormwater which seek to replicate natural undeveloped catchment. SUDS are required to give a sustainable solution to deal with rainwater runoff from roofs and impermeable hard landscaped areas such as car parks, service yards and access roads. Government policy through PPS25 (Planning Policy Statement) states that it is essential for the integration of sustainable drainage systems into the overall site concept and layout. Furthermore, the planning system can further the use of sustainable drainage systems by persuading developers to adopt sustainable drainage systems wherever practicable, as part of all future development, if necessary through the use of appropriate planning conditions. The SEL Source Control System comprises a series of treatment phases which have been specifically developed to provide the ideal SOURCE CONTROL solution to meet the requirements of all current guidelines and legislation relating to SUDS, whilst incorporating traditional impermeable surfacings such as macadam, asphalt, concrete and standard block paving. 2 sales@althon.co.uk

3 The SEL Source Control System Why Source Control? Source Control is the treatment and controlled release of storm water runoff at or very near its source. Source Control is the preferred technique for the implementation of SUDS according to the Interim Code of Practice for Sustainable Drainage Systems, PPS25 and PPG3 (see extract below). The risks inherent with traditional drainage systems are: Operatives working in deep excavations where there is risk of collapse Heavy lifting operations Operatives working within confined spaces Operatives exposure to contaminated sub-strata The SEL Source Control System avoids these foreseeable risks because it is shallow (generally less than 500mm deep), lightweight, installed above formation levels and contaminated zones. One of the main benefits of using the SEL Source Control System is that water is treated and subsequently attenuated or infiltrated as close to the surface as possible. Employing the SEL Source Control System in this manner can lead to a dramatic reduction in the amount of earthworks required on site, and is particularly beneficial where specific problems exist, such as high water tables, contamination, or poor ground conditions (i.e. low CBR). The SEL Permavoid unit is the only product of its type which is designed to create a structural void within the sub-base layer, substituting expensive imported aggregates. CDM Obligations The SEL Source Control System satisfies the designers statutory obligations as required by the Construction Design and Management (CDM) regulations. Key Features Complete Source Control SUDS solution for new build or retrofit development Replaces Oil Separators as defined by PPG3 (Pollution Prevention Guidelines) Six stages of water treatment available within the system Provides treatment at source by gravity separation and bio-degradation of oils and silts Provides attenuation or infiltration at source Replaces sub-base, minimises the requirement for imported aggregate Shallow construction, minimises residual excavated material Contributes to BREEAM ratings Satisfies designers risk assessments in accordance with CDM Reduces the requirement for chambers and pipes Improves water quality A practical solution for the retrofit of SUDS components into existing drainage schemes SEL Permavoid and other system components are manufactured from recycled material and are also recyclable and reusable Resistant to frosts, salts and hydrocarbons 3

4 SEL Source Control System Overview - Attenuation Treatment Stages 1 & 2 - SEL Permachannel Treatment at source SEL Permachannel silt/oil separator to PPG3 levels. Phase 1 treatment oil separation to meet the criteria set out in PPG3. Phase 2 treatment silt deposition using low velocity (micro catchment) gravity separation. See page 6 for full information. Treatment Stage 3 - SEL Permafilter Biomat Phase 3 treatment removal and degradation of residual hydrocarbon by use of floating Permafilter Biomat. See page 6 for full information. Treatment Stage 4 - SEL Permavoid Phase 4 treatment shallow attenuation providing effective dilution and dispersal using large surface area. See page 7 for full information. 4 sales@althon.co.uk

5 The SEL Source Control System Treatment Stage 6 - SEL Permaceptor Treatment Stage 5 - Flow Control Sump Chamber Phase 5 treatment simple, shallow, low head flow control for effective settlement of silt. Easy access facilitates simple inspection, monitoring and maintenance. See page 7 for full information. Phase 6 treatment - Final polish for sensitive applications on high risk sites (e.g. protected aquifers). Also intercepts and contains hydrocarbons for subsequent removal and disposal where there is a high risk of a catastrophic spillage (e.g. refuelling areas or household recycling centres). See page 8 for full information 5

6 Treatment Stages 1 & 2 SEL Permachannel The SEL Permachannel is aesthetically similar to a traditional drainage channel. However, unlike traditional drainage channels, each individual 1m long SEL Permachannel unit is a self contained water treatment system. This in effect, provides a series of many small silt/oil separators across a development at source and eliminates the need for an end of line oil separator as defined in PPG3. Each SEL Permachannel deals effectively with a small runoff catchment area (micro-catchment), typically 30m 2. There is no lateral flow between adjacent units therefore water is effectively stilled at source. This prevents emulsification and solids in suspension at the earliest opportunity. In order to achieve such efficient treatment outfall points are at 1m intervals and are integral to each unit. Key Features Typically 30m 2 micro-catchments Prescribed micro-catchment with proportional effluent and silt loading Gravity separation of oils and silts at source 2 phases of water treatment hydrocarbons and solids in suspension Stilling of flows for controlled silt deposition and emulsification prevention Trapped effluents and normal spillages are naturally bio-degraded by aerobic digestion Catastrophic spillages are intercepted and contained for safe extraction and controlled disposal Simple access and maintenance Standard D400 loading, slotted or heel-proof ductile iron grating Rapid non-specialist installation Treatment Stage 3 SEL Permafilter Biomat The SEL Permafilter Biomat is a standard SEL Permavoid unit (see page 7) which incorporates a floating oil absorbent mat (Biomat). The SEL Permafilter Biomat has two main treatment features: 1. The capture of residual hydrocarbons which escape from the SEL Permachannel (i.e. in the event of a catastrophic spillage such as a ruptured HGV engine sump). 2. The promotion of a self-maintaining ecosystem, with bacteria digesting the captured hydrocarbons and protozoa regulating the bacteria. The air layer above the Biomat encourages microbes to form a biofilm on top of the Biomat that use trapped hydrocarbons as a sole nutrient source, thus removing pollutants through biodegradation. As the Biomat is a floating component, the biofilm is always kept above the water level within the system preventing bacteria being flushed away during storm conditions. Separate technical and research papers are available for this product on request. Key Features Captures residual hydrocarbons and other pollutants Removes pollutants by biodegradation Provides a third stage of water treatment within the SEL Source Control System Catastrophic spillages intercepted and treated at source Replaces sub-base, minimises the requirement for imported aggregates Shallow construction, minimises residual excavated material Satisfies designers risk assessments in accordance with CDM Improves water quality Manufactured from recycled material and also recyclable Lightweight and easily handled (3Kg per unit) 6 sales@althon.co.uk

7 The SEL Source Control System Treatment Stage 4 SEL Permavoid The SEL Permavoid unit is specifically designed to create a structural void directly below the surfacing layers replacing granular sub-base. When the SEL Source Control System is appropriately designed, the SEL Permavoid units can significantly reduce or eliminate the requirement for dangerous deep excavation, and this is particularly beneficial where digging causes expensive problems such as in areas with high water tables or contamination. SEL Permavoid can be used to provide either attenuation (when encapsulated in impermeable membrane) or infiltration (when encapsulated in geotextile). The infiltration performance can be further optimised by using the SEL Permavoid in a narrow vertical orientation. This arrangement provides two parallel faces with large surface area typically only 150mm or 300mm apart, thus maximising water flow into the ground. (See Fig 7 on page 14) SEL Permavoid is highly voided (95%), high strength and creep resistant. When used as a component of the SEL Source Control System a further treatment phase is provided by the dilution of residual pollutants over large areas. As the unit is highly voided there are no barriers to this process as there would be within a typical stone formation. Key Features Provides a fourth water treatment phase within the SEL Source Control System Shallow construction, minimises residual excavated material Large surface area to depth ratio provides exceptional infiltration performance, in turn reducing attenuation volume requirement Satisfies designers risk assessments in accordance with CDM Manufactured from recycled material and also recyclable Unique jointing system (SEL Permatie) provides creep resistance Provides a high strength rigid raft for construction Lightweight and easily handled (3Kg per unit) Replaces sub-base, minimises the requirement for imported aggregates Treatment Stage 5 - Attenuation SEL Permafilter Flow Control Chamber The SEL Permafilter Flow Control Chamber is used to restrict the flow from the SEL Permavoid units when the SEL Source Control System is being used to provide attenuation. The small head differential and extremely low velocities within the system allow for flow to be controlled by a simple orifice plate. The flow control also incorporates a removable and replaceable debris screen to protect the outflow pipe. By virtue of source control, sites are divided into many small catchments each individually controlled. Consequently interconnecting pipework is minimal, small diameter (generally not greater than 150mm diameter) and at shallow depth. The SEL Permafilter Flow Control Chambers are manufactured to suit precise invert levels, and orifice plates are tailor made to suit individual requirements. The silt capacity within the flow control chamber sump offers an additional phase of water treatment. Key Features Non specialist installation Factory formed for rapid installation Tailor made to suit specific flows Shallow low head flow control No mechanical parts Effective settlement of silt Easy access facilitates simple inspection, monitoring and maintenance Provides a fifth water treatment phase within the SEL Source Control System when used for attenuation 7

8 Treatment Stage 6 SEL Permaceptor The SEL Permaceptor is the most significant advance in oil interceptor technology in recent times. The device allows only clean water to pass forward with residual hydrocarbons and silts intercepted and retained. The SEL Permaceptor is incorporated where the designer requires an effluent polishing stage to the SEL Source Control System. The device is also ideal for use where there is a high risk of a catastrophic spillage (e.g. refuelling areas or household recycling centres). The SEL Permaceptor is located at strategic positions to polish the effluent which reduces the adverse effects of contaminated runoff from urban surfaces into local sewers, watercourses and underlying aquifers. In the unlikely event of a catastrophic spillage, very large volumes of oil (circa 500 litres) are intercepted and retained for subsequent removal and safe disposal. The SEL Permaceptor concept has been developed into many forms for incorporation into refuelling areas, car parks, recycling areas and driveways giving it the flexibility to be designed and configured to suit site specific requirements. Key Features Intercepts catastrophic spillage Provides final polishing, as defined in PPG3 Non specialist installation Factory formed for rapid set up No mechanical parts Easy access for removal of trapped oils Designed to suit any catchment Encapsulation for attenuation systems The SEL Source Control System recognises the importance of ensuring the integrity of attenuation systems where it is essential that fluids are to be kept within the drainage system (e.g. where there is a potential of contaminants leaching into a protected aquifer). SELflex 1.0PP Geomembrane is a 1mm thick robust polypropylene sheet which requires joints to be fusion welded and subsequently air-tested. This in turn is protected by SELtex 300R, a 300g/mm2 Geotextile with exceptional dimensional stability consisting of a woven polyester core reinforced with needle-punched outer layers. This arrangement must be used where the engineer insists on a watertight system. If permeability rates are too low for full infiltration, but it is not essential to provide a watertight arrangement, then SEL Sudstex Permafilter Geotextile should be used. Please see Page 11 for more details of this product. A variant of the SEL Permaceptor is the SEL Gullyceptor, a small, lightweight, shallow Permaceptor unit factory formed to provide treatment to a single road/yard gully. This in effect provides a silt/oil separator at source for each gully position in the system and eliminates the need for an end of line petrol interceptor as defined in PPG3. The SEL Gullyceptor is intended to complement the SEL Permachannel system where appropriate or to be used in isolation to deal with small catchments. 8 sales@althon.co.uk

9 The SEL Source Control System SEL Gullyceptor - Fig 1 3. Access for removal of trapped hydrocarbons Standard HDPE or PCC gully 2. SEL Gullyceptor Unit 9

10 System Overview - Infiltration Treatment Stages 1 & 2 - SEL Permachannel Treatment Stage 3 - SEL Permafilter Biomat See page 6 for full information. Treatment Stage 4 - SEL Permavoid See page 7 for full information. Treatment Stage 5 - Infiltration SEL Sudstex Permafilter Geotextile Phase 5 treatment removal and degradation of residual hydrocarbons. See page 11 for full information. 10 sales@althon.co.uk

11 The SEL Source Control System SEL Sudstex Permafilter Geotextile The SEL Sudstex Permafilter geotextile is a non-woven, dimpled, needle punched geotextile that has been specifically designed for hydrocarbon pollution treatment in civil engineering applications. The dimpled geotextile consists of a proprietary blend of polyester fibres that incorporate oleophobic/hydrophilic (oil repellent/affinity for water) properties to achieve superior oil retention. The SEL Sudstex Permafilter geotextile is capable of retaining oil contamination ranging from daily car drip losses up to catastrophic spillages - i.e. originating from ruptured engine sumps up to a maximum of 6 litres of oils per 10m 2 of geotextile. The entrapped hydrocarbons are biodegraded by naturally occurring micro-organisms providing a self-cleansing mechanism. Effluent discharge at maximum oil retention is less than 10 parts per million. Within the SEL Source Control System the SEL Sudstex Permafilter Geotextile is used to encapsulate SEL Permavoid Units where either full or part infiltration is the preferred design solution. Full infiltration within the SEL Source Control System allows the full runoff from hardened areas to be retained within the site boundary and returned to the underlying water course at source. The SEL Sudstex Permafilter geotextile is particularly suited for part infiltration, or leaky tank solution. This is where the permeability rates of surrounding soils are too low for full infiltration, but advantage can be taken of any infiltration available to reduce the size of attenuation tanks, even though the drainage system is connected to an off-site outfall. A further advantage is that it would not be necessary to fully encapsulate attenuation tanks in welded geomembrane, thus saving cost and installation time. This solution is most appropriate where there are no limiting factors such as contamination or poor ground conditions. Key Features Captures residual hydrocarbons Removes pollutants by biodegradation Provides a fifth stage of water treatment within the SEL Source Control System when used for infiltration Catastrophic spillages intercepted and treated at source Non-specialist installation Improves water quality 11

12 SEL Permavoid and Roof Runoff Dealing with the collection, initial treatment and control at source of rainwater runoff from roofs is an integral part of the surface water drainage design. There are two ways of collecting rainwater from roofs either standard downpipes or siphonic collection. For a standard downpipe system, the SEL Source Control System incorporates a choice of two small diameter chambers (see Figs 2 and 3 below) with integral debris guard and sump prior to connection to SEL Permavoid attenuation or infiltration systems, providing initial filtration and silt separation for the roof runoff. For a siphonic drainage system, roof water is directed into the SEL Permavoid units via pressure break silt chambers and bespoke manifold fabrications designed specifically to maintain the flow volume whilst reducing the high velocity of the siphonic collection system. The SEL Permavoid units can be orientated in the configurations as used with the SEL Permachannel bringing the same benefits of shallow construction, high permeability ratio (if being used for infiltration) and high void ratio (if being used for attenuation). Fig 2 Typical 300mmØ External RWP Catchpit Detail Fig 3 Typical 500mmØ External RWP Catchpit Detail 380 x 310mm H.D. Pedestrianised Grating Class D400 Class B Engineering brick minimum 1 course laid on mortar bed 450 x 450mm H.D. Cover and Frame Class D400 Class B Engineering brick minimum 1 course laid on mortar bed From RWP From RWP 110mmØ OD incoming pipe 300mmØ Polypropylene chamber 8mm thick walls and 10mm thick base 5mmØ HDPE Polypropylene filter mesh to provide debris guard over outlet pipe 160mmØ OD outgoing pipe Min 150mm concrete bed and surround to Engineers specification 160mmØ OD incoming pipe 500mmØ Polypropylene chamber 13mm thick walls and 10mm thick base Removable HDPE screen with 5mm mesh panel 160mmØ OD outgoing pipe Min 150mm concrete bed and surround to Engineers specification 12 sales@althon.co.uk

13 The SEL Source Control System RWP connection to vertical soakaway - Fig 3a SEL 500mm external RWP catchpit 3. SEL Socket Box, 160mm socket in 708 x 354mm face 2. Typical 160mm diameter pipe with concrete surround 4. SEL Sudstex Permafilter Geotextile 5. SEL Permavoid Unit, 2 layers thick in vertical orientation 5 Note: Under BRE regulations it is mandatory to position soakaways a minimum of 5m from building foundations 13

14 Typical Configurations for SEL Permachannel Type 1 Fig 4-130mm cover, Cars Only Typical car parking bay. Single permavoid layer Fig 5 - Permachannel Universal Connector Rotate to align with invert of permavoid layer Permachannel universal connector has to be rotated level with the base of the permavoid layer (see fig 5) Typically: A. 80mm concrete block paving B. 50mm sand bedding layer Over 150mm deep Permavoid Typically: A. 80mm concrete block paving B. 50mm sand bedding layer Over 150mm deep Permavoid 1. SEL Permachannel 2. SEL Permachannel Universal Connector, see note right * 3. SEL Permafilter Biomat on 50mm bedding layer 4. SEL Permavoid on 50mm bedding layer 5. SEL Selflex 1.0 PP Geomembrane protected by Seltex HD300 Geotextile (for attenuation) OR SEL Permafilter Sudstex Geotextile (for infiltration) * For cover levels of 300mm or less the permachannel connection should be installed horizontally. For cover levels greater than 300mm the permachannel connector should be installed vertically and will require a 40mm Ø 90 bend and a piece of 40mm Ø pipe * where the distance from ground level to base of the permavoid layer is less than 400mm, the permachannel connector must be rotated until it's lowest point is level with the base of the permavoid layer. * All the minimum cover depths assume a minimum of 10% CBR for cases where infiltration occurs or a minimum of 5% CBR for tanked systems. 1. SEL Permachannel 2. SEL Permachannel Universal Connector, see note below * 3. SEL Permafilter Biomat on 50mm bedding layer 4. SEL Permavoid on 50mm bedding layer 5. SEL Selflex 1.0 PP Geomembrane protected by Seltex HD300 Geotextile (for attenuation) OR SEL Permafilter Sudstex Geotextile (for infiltration) * For cover levels of 300mm or less the permachannel connection should be installed horizontally. For cover levels greater than 300mm the permachannel connector should be installed vertically and will require a 40mm Ø 90 bend and a piece of 40mm Ø pipe * where the distance from ground level to base of the permavoid layer is less than 400mm, the permachannel connector must be rotated until it's lowest point is level with the base of the permavoid layer. * All the minimum cover depths assume a minimum of 10% CBR for cases where infiltration occurs or a minimum of 5% CBR for tanked systems. ** Permachannel concrete bed removed for clarity Note: a kerb has been shown for perspective only and is not a necessary component of the system. 14 sales@althon.co.uk

15 Typical Configurations for SEL Permachannel Type 1 Fig 6-260mm cover, Cars, Vans & Occasional HGV Typical access road, Single permavoid layer Fig 7-260mm cover, Cars, Vans & Occasional HGV Typical access road, Double permavoid layer Typically: A. 40mm surface course B. 80mm binder course C. 140mm granular layer dot type 1 Over 150mm deep Permavoid Typically: A. 40mm surface course B. 80mm binder course C. 140mm granular layer dot type 1 Over 300mm deep Permavoid 1. SEL Permachannel 2. SEL Permachannel Universal Connector 3. SEL Permafilter Biomat on 50mm bedding layer 4. SEL Permavoid on 50mm bedding layer 5. SEL Selflex 1.0 PP Geomembrane protected by Seltex HD300 Geotextile (for attenuation) OR SEL Permafilter Sudstex Geotextile (for infiltration) * For cover levels of 300mm or less the permachannel connection should be installed horizontally. For cover levels greater than 300mm the permachannel connector should be installed vertically and will require a 40mm Ø 90 bend and a piece of 40mm Ø pipe * where the distance from ground level to base of the permavoid layer is less than 400mm, the permachannel connector must be rotated until it's lowest point is level with the base of the permavoid layer. * All the minimum cover depths assume a minimum of 10% CBR for cases where infiltration occurs or a minimum of 5% CBR for tanked systems. Occasional HGV equates to a weekly bin lorry 1. SEL Permachannel 2. SEL Permachannel Universal Connector 3. SEL Permafilter Biomat on 50mm bedding layer 4. SEL Permavoid on 50mm bedding layer 5. SEL Selflex 1.0 PP Geomembrane protected by Seltex HD300 Geotextile (for attenuation) OR SEL Permafilter Sudstex Geotextile (for infiltration) * For cover levels of 300mm or less the permachannel connection should be installed horizontally. For cover levels greater than 300mm the permachannel connector should be installed vertically and will require a 40mm Ø 90 bend and a piece of 40mm Ø pipe * where the distance from ground level to base of the permavoid layer is less than 400mm, the permachannel connector must be rotated until it's lowest point is level with the base of the permavoid layer. * All the minimum cover depths assume a minimum of 10% CBR for cases where infiltration occurs or a minimum of 5% CBR for tanked systems. Occasional HGV equates to a weekly bin lorry 15

16 Typical Configurations for SEL Permachannel Type 2 Fig 8-300mm cover, Cars, Vans & Occasional HGV Typical service yard, Double permavoid layer Fig 9-400mm cover and greater, Cars, Vans & HGV Typical service road, Single permavoid layer Typically: A. 250mm reinforced concrete slab B. 50mm bedding layer Over 300mm deep Permavoid Typically: A. 40mm surface course B. 80mm binder course C. 100mm base course D. 180mm granular layer dot type 1 Over 150mm deep Permavoid 1. SEL Permachannel 2. SEL Permachannel Universal Connector 3. SEL Permafilter Biomat on 50mm bedding layer 4. SEL Permavoid on 50mm bedding layer 5. SEL Selflex 1.0 PP Geomembrane protected by Seltex HD300 Geotextile (for attenuation) OR SEL Permafilter Sudstex Geotextile (for infiltration) * For cover levels of 300mm or less the permachannel connection should be installed horizontally. For cover levels greater than 300mm the permachannel connector should be installed vertically and will require a 40mm Ø 90 bend and a piece of 40mm Ø pipe * where the distance from ground level to base of the permavoid layer is less than 400mm, the permachannel connector must be rotated until it's lowest point is level with the base of the permavoid layer. * All the minimum cover depths assume a minimum of 10% CBR for cases where infiltration occurs or a minimum of 5% CBR for tanked systems. 1. SEL Permachannel 2. 40mm Ø 90 bend and 40mm Ø pipe extension * 3. SEL Permachannel Universal Connector 4. SEL Permafilter Biomat on 50mm bedding layer 5. SEL Permavoid on 50mm bedding layer 6. SEL Selflex 1.0 PP Geomembrane protected by Seltex HD300 Geotextile (for attenuation) OR SEL Permafilter Sudstex Geotextile (for infiltration) * For cover levels of 300mm or less the permachannel connection should be installed horizontally. For cover levels greater than 300mm the permachannel connector should be installed vertically and will require a 40mm Ø 90 bend and a piece of 40mm Ø pipe * where the distance from ground level to base of the permavoid layer is less than 400mm, the permachannel connector must be rotated until it's lowest point is level with the base of the permavoid layer. * All the minimum cover depths assume a minimum of 10% CBR for cases where infiltration occurs or a minimum of 5% CBR for tanked systems. Note: a kerb has been shown for perspective only and is not a necessary component of the system. 16 sales@althon.co.uk

17 The SEL Source Control System Typical Configurations for SEL Permachannel Type 2 Fig 10 - Permavoid Bardon SudsAgg System for Car Park Drainage. 260mm cover, Cars, Vans & Occasional HGV Fig 11 - Permavoid Soakway / Infiltration Trench 260mm cover, Cars, Vans & Occasional HGV Typical access road Typically: A. 40mm surface course B. 80mm binder course C. 140mm granular dot type 1 over D. 150mm Permavoid / Bardon SudsAgg OR 140mm Bardon SudsAgg over 150mm Permavoid Bardon SudsAgg into Bardon SudsAgg blanket Single row of 150mm deep Permafilter Biomat Typically: A. 40mm surface course B. 80mm binder course C. 140mm granular layer dot type 1 D. 200mm 6F2 capping (minimum 15% CBR to be achieved) Over Permavoid soakaway depth to suit site requirements 1. SEL Permachannel 2. SEL Permachannel Universal Connector 3. SEL Permafilter Biomat (single row) on 50mm bedding layer 4. SEL Selflex 1.0 PP Geomembrane protected by Seltex HD300 Geotextile (for attenuation) OR SEL Permafilter Sudstex Geotextile (for infiltration) * For cover levels of 300mm or less the permachannel connection should be installed horizontally. For cover levels greater than 300mm the permachannel connector should be installed vertically and will require a 40mm Ø 90 bend and a piece of 40mm Ø pipe * where the distance from ground level to base of the permavoid layer is less than 400mm, the permachannel connector must be rotated until it's lowest point is level with the base of the permavoid layer. * All the minimum cover depths assume a minimum of 10% CBR for cases where infiltration occurs or a minimum of 5% CBR for tanked systems. Occasional HGV equates to a weekly bin lorry 1. SEL Permachannel 2. SEL Permachannel Universal Connector 3. SEL Permafilter Biomat 4. SEL Permavoid on 50mm bedding layer 5. SEL Permafilter Sudstex Geotextile (for infiltration) * For cover levels of 300mm or less the permachannel connection should be installed horizontally. For cover levels greater than 300mm the permachannel connector should be installed vertically and will require a 40mm Ø 90 bend and a piece of 40mm Ø pipe * where the distance from ground level to base of the permavoid layer is less than 400mm, the permachannel connector must be rotated until it's lowest point is level with the base of the permavoid layer. * All the minimum cover depths assume a minimum of 10% CBR for cases where infiltration occurs or a minimum of 5% CBR for tanked systems. Occasional HGV equates to a weekly bin lorry Note: a kerb has been shown for perspective only and is not a necessary component of the system. 17

18 Components 1. SEL Permachannel mk2 with Standard Grating - GRATING 150mm wide x 210mm deep x 1000mm long Weight = 29Kg Composition - Polymer concrete body with boltless ductile iron gratings and frames 1 4. Permachannel Universal Connector - 4 SELW06305 Material: polypropylene Weight: 210g Dimensions: 260mm long x 190mm wide x 39mm deep with max 135mm long 40mm diameter connector pipe 2. SEL Permachannel Grating Removal Tool - SELW03006 Material: 5mm thick stainless steel, pvc grip Weight: 296g Dimensions: handle 193mm x 44mm, shoulder 104mm, 2 x 75mm release prongs 2 5. SEL Permavoid Unit - SELK mm x 354mm x 150mm Weight = 3.0Kg Composition - Polypropylene 5 3. SEL Permachannel mk2 channel end cap 150mm wide x 210mm deep Weight = 2.2Kg Composition - Polymer concrete 3 18 sales@althon.co.uk

19 The SEL Source Control System Components 6. SEL Permafilter Biomat Unit - SELW mm x 354mm 150mm Weight = 3.1Kg Composition - Polyprolyene 6 9. SEL Diffuser Unit - Part Numbers Between SEL09011 to SEL09391 Sizes to suit site specific requirements Pre-wrapped in 2mm protective mesh To suit 110mm and 160mm pipe diameters 9 7. SEL Permatie - SELK mm x 34mm x 74mm Weight = 0.04Kg Composition - Polypropylene 8. SEL Permatie Shear Connector - SELK mm x 35mm diameter Weight = 0.01Kg Composition - Polypropylene SEL Permavoid Rigid Apron Spigot 10 Tank Adapter - SEL06101 Adaptor (for welded membrane applications) 160/150 to suit 160mm diameter BS4660 pipework. Other unit sizes available to suit site specific requirements. Weight = 0.5Kg for SELW06101 other sizes vary in weight. Composition - Polypropylene 19

20 Components 11. SEL Permavoid Rigid Apron Spigot 11 Tank Adapter - SELW06201 Adaptor (for welded membrane applications) 160/150 to suit 160mm diameter BS4660 pipework. Other unit sizes available to suit site specific requirements. Weight = 0.6Kg for SELW06002 other sizes vary in weight. Composition - Polypropylene 12. SEL Permavoid Saddle Connector - 12 SELW /150 to suit 160mm diameter BS4660 pipework. Other unit sizes available to suit site specific requirements. Weight = 0.8Kg for SELW06503 other sizes vary in weight. Composition 1mm Weldable Polypropylene Sheet. 13. SELFlex 1.0 PP Geomembrane 13 Roll size: SELK03008 SELFLEX 1.0PP; 3x100m roll or SELK03010 SELFLEX 1.0PP; 6x100m roll Weight: 0.9kg/m² Composition: 1mm thick weldable polypropylene sheet 14. Seltex HD300 Roll size: SELK02019 SELTEX HD300 geotextile; x65m roll or SELK02020 SELTEX HD300 geotextile; 5.25 x65m roll Weight: 300g/m² Composition: polypropylene 15. SEL SUDSTex Geotextile - SELK02007 Roll size 2.4m x 100m. Weight 300g/sq.m. Composition - Polyester blend 16. SEL Permatex 160WD - SELK02027 Waterproof geotextile Roll size: 4x100m Weight: 160g/m² Composition: modified polyester sales@althon.co.uk

21 The SEL Source Control System Components 17. SEL Plain Sump SELW mm diameter x 300mm deep sump, height variable up to 1.25m deep Weight variable up to 30Kg Composition Polypropylene SEL Large RWP Sump SELW mm diameter complete with sump and debris guard. Weight variable up to 20Kg Composition Polypropylene SEL Flow Control Sump SELW mm diameter x 300mm deep sump, height variable up to 1.25m deep Incorporating Permafilter flow control with debris guard. Weight variable up to 30Kg Composition Polypropylene 19. SEL Small RWP Sump SELW mm diameter complete with sump and debris guard. Weight variable up to 6Kg Composition Polypropylene SEL Gullyceptor - SELW mm x 708mm x 300mm deep Weight approx 25Kg Composition - Polypropylene with geotextile 22. SEL Permaceptor SELW mm x 4248mm x 300mm deep This unit will retain up to 500 litres of oil. Units can be sized to suit site specific oil retention requirements. Weight approx 180Kg for SELW04006 other sizes vary in weight

22 SEL Source Control System Typical Layouts Option 1; ATTENUATION Bituminous bound or concrete block paved car park. Concrete service yard This illustration shows how the SEL Source Control System may be arranged to achieve a limited discharge from the development where infiltration is not possible and ATTENUATION is required. The rainwater runoff from the external hardstanding areas is collected and treated by SEL Permachannel silt / oil separators and passed forward through SEL Permafilter Biomats into 150mm or 300mm deep SEL Permavoid shallow attenuation units within the sub base layer. The installation is encapsulated with SELflex impermeable welded geomembrane protected by SELtex 300 R robust reinforced geotextile. Flows from the roof are passed via SEL RWP Sumps to SEL Permavoid attenuation structures. Gullies are utilised to collect runoff from the access road which is passed through and treated by SEL Gullyceptor units. The allowable discharge from the entire site is distributed and balanced by controlling the flow from each attenuation structure using SEL Flow Control Sumps. Although typical, this illustration is intended for guidance only. Actual storage volumes and arrangement will depend on site specific design parameters and layouts. 22 sales@althon.co.uk

23 The SEL Source Control System s Option 2; INFILTRATION Bituminous bound access road; Bituminous bound or concrete block paved car park. Concrete service yard This illustration shows how the SEL Source Control System may be arranged to achieve an effective INFILTRATION scheme. The run off from the car park and access road areas is collected and treated by SEL Permachannel silt / oil separators and passed forward through SEL Permafilter Biomats into 150mm or 300mm deep SEL Permavoid shallow attenuation units within the sub base layer. The installation is encapsulated with SEL Sudstex Permafilter Geotextile. Flows from the roof are passed via SEL RWP Sumps to SEL Permavoid attenuation structures also encapsulated with SEL Sudstex Permafilter Geotextile allowing infiltration. The service yard area embraces a similar concept but shows a vertical orientation of the Permavoid attenuation structures which can maximise the infiltration contact area, thus minimising the volume of attenuation required. Gullies are utilised to collect runoff from some of the access road which is passed through and treated by SEL Gullyceptor units prior to infiltration. Although typical, this illustration is intended for guidance only. Actual storage volumes and arrangement will depend on site specific design parameters and layouts. 23

24 SUPPLY Other products from Althon Ordering Please contact our Sales Office at Norwich. Prices and Conditions of Sale Information on request from our Norwich office. Delivery Information on request from our Norwich office. TECHNICAL SERVICES To support architects, engineers and contractors in designing and installing the SEL Source Control System, our Design Services Department offers computer aided scheme design, hydraulic performance calculations and advice on installation. Supply and install packages are available for elements of the system information available on request. Contact Information Telephone hotline: Fax line: or Althon High Capacity Channel Drainage System Althon Headwall Drainage Outfalls and Inlets Althon Skeletank Rainwater Harvesting Attenuation and Soakaway address: Althon Ltd reserves the right to change or modify the design of products and specifications as their policy is one of continued research and improvement. The information contained in this publication is believed to be correct at the date of publication, but it should be understood that between publications there may be changes in pertinent standards or regulations affecting the accuracy of the information contained therein. Please contact ALTHON LIMITED, Vulcan Road South, Norwich NR6 6AF Telephone: Fax: