SUDS

151 STORMWATER MANAGEMENT

SUDS

Ongoing land development and climate change place increasingburdens on existing surface water drainage networks, resulting inthe need to make dramatic changes in our approach to the safemanagement of surface water.

The use of Sustainable Urban Drainage Systems (SUDS) is one of the most effective ways to reduce pollution and flooding risk as confirmed through Government legislation and planning guidancesuch as PPG25 ‘ Development and flood risk’.

The civils team at EH Smith can suggest the most suitable solutionfor each specific requirement from the many options now available.

STORMWATER MANAGEMENT

STORMWATER MANAGEMENT 152

PRECAST CONCRETE BOX CULVERTSDesign Chemical Class DC-4 Resistance

Milton Precast Concrete Box Culverts are specified and used regularly for culvertinghighways, storm and foul sewers, sea outfalls, tunnels and subways, underpasses,stream crossings, vertical chambers and in modified form as channels with removableslabs or as portals. In addition they may be used as tanks for attenuation of storm orfoul water and can be provided with dished inverts or channels for dry weather flow.

Box Culverts provide high flow capacities even where the gradient is low or headroomis restricted. They are individually designed to cater for a wide range of external loadingconditions from shallow to deep fill.

BeddingIt is generally recommended that the culvert should be installed on a 200 thick granularbedding as specified in the Specification for Highway Works (MCDHW) or UK WIR Ltd'Civil engineering specification for the water industry'. Alternative bedding designsusing insitu concrete and blinding or piling may be required in poor ground.

Laying and jointingJoint priming may be applied at works or on site. Position the first unit with the socketfacing the direction of construction to receive the second unit. Fix the appropriate typeof jointing tackle to the culverts and apply the Milseal jointing strip to the slopingprimed face of the socket to form a complete gasket mitring joins and at the corners.

Supporting the weight of the second unit, guide it as closely as possible to the first unit taking care to exclude any bedding material. Carefully draw the spigot of the second culvert into the socket of the first. The flexible jointing compound should becompressed by not less than 30% to effect the necessary seal. This is achieved whenthe gap between the joint faces on the insideof the culvert does not exceed 10mm. It isrecommended that the dead anchor is notrelocated for jointing subsequent units untilthe cable or chain length is exceeded.Jointing equipment should be capable ofproviding a force of I0kN per metre run ofjointing strip.


PRECAST CONCRETE BOX CULVERTS SIZES


MCI 0.05 1.00 0.50 2.0 0.485 0.58 2.25MC1O.07 1.00 0.75 2.0 0.735 1.01 2.57MCI 2.05 1.25 0.50 2.0 0.591 0.74 2.66MCI 2.07 1.25 0.75 2.0 0.904 1.32 2.97MCI 3.05 1.375 0.50 2.0 0.654 0.84 2.81MCI 3.06 1.375 0.625 2.0 0.826 1.17 2.75MCI 3.07 1.375 0.75 2.0 0.998 1.52 3.13MCI 3.10 1.375 1.00 2.0 1.341 2.25 3.44MCI 5.07 1.50 0.75 2.0 1.065 1.62 3.84MCI 5.10 1.50 1.00 2.0 1.440 2.44 4.15MCI 5.12 1.50 1.25 2.0 1.815 3.31 4.49MC 15.15 1.50 1.50 2.0 2.190 4.20 4.80MCI 7.07 1.75 0.75 2.0 1.252 2.03 4.22MCI 7.10 1.75 1.00 2.0 1.690 3.06 4.53MCI 7.12 1.75 1.25 2.0 2.128 4.15 4.84MCI 7.15 1.75 1.50 2.0 2.565 5.28 5.63MCI 8.10 1.875 1.00 2.0 1.815 3.37 5.09MC20.10 2.00 1.00 2.0 1.940 3.69 5.79MC20.12 2.00 1.25 2.0 2.440 5.03 6.17MC20.15 2.00 1.50 2.0 2.940 6.42 6.54MC20.20 2.00 2.00 2.0 3.940 9.31 7.30MC22.12 2.25 1.25 2.0 2.753 5.94 6.60MC22.15 2.25 1.50 2.0 3.315 7.60 6.98MC22.17 2.25 1.75 2.0 3.878 9.31 7.35MC24.10A 2.40 1.00 1.5 2.340 4.75 6.43MC24.12A 2.40 1.20 1.5 2.820 6.14 6.73MC24.15A 2.40 1.50 1.5 3.540 8.33 7.17MC24.18A 2.40 1.80 1.5 4.260 10.60 7.62MC24.21A 2.40 2.10 1.5 4.980 12.94 8.07MC25.10 2.50 1.00 2.0 2.440 5.03 8.78MC25.15 2.50 1.50 1.5 3.690 8.82 7.33MC25.17 2.50 1.75 1.5 4.315 10.83 7.70MC27.10A 2.70 1.00 1.5 2.640 5.57 7.79MC27.12A 2.70 1.20 1.5 3.180 7.22 8.13MC27.15A 2.70 1.50 1.5 3.990 9.82 8.63MC27.18A 2.70 1.80 1.5 4.800 12.54 9.14MC27.21A 2.70 2.10 1.5 5.610 15.34 9.64MC27.12 2.75 1.25 1.5 3.377 7.84 8.34MC27.15 2.75 1.50 1.5 4.065 10.08 8.71MC27.17 2.75 1.75 1.5 4.753 12.40 9.16MC27.20 2.75 2.00 1.5 5.440 14.78 9.60MC30.10A 3.00 1.00 1.5 2.940 6.41 8.35MC30.12A 3.00 1.20 1.5 3.540 8.33 8.69MC30.15A 3.00 1.50 1.5 4.440 11.36 9.19MC30.18A 3.00 1.80 1.5 5.340 14.54 9.70MC30.21A 3.00 2.10 1.5 6.240 17.82 10.20MC30.20 3.00 2.00 1.0 5.940 16.72 7.54MC30.25 3.00 2.50 1.0 7.440 22.33 8.08MC30.27 3.00 2.75 1.0 8.190 25.19 8.43MC33.10A 3.30 1.00 1.5 3.240 7.27 8.91MC33.12A 3.30 1.20 1.5 3.900 9.45 9.25MC33.15A 3.30 1.50 1.5 4.890 12.93 9.75MC33.18A 3.30 1.80 1.5 5.880 16.59 10.26MC33.21A 3.30 2.10 1.5 6.820 20.38 10.76MC35.15 3.50 1.50 1.0 5.190 14.00 7.73MC36.10A 3.60 1.00 1.5 3.540 8.14 9.47MC36.12A 3.60 1.20 1.5 4.260 10.60 9.81MC36.15A 3.60 1.50 1.5 5.340 14.54 10.31MC36.18A 3.60 1.80 1.5 6.420 18.69 10.82MC36.21A 3.60 2.10 1.5 7.500 23.00 11.32MC40.25 4.00 2.50 1.0 9.940 33.53 9.97

Design Chemical Class DC-4 Resistance

Type Internal Dimensions (m) Effective Flow Rate at Nominal Cross Fall WeightSectional Area 1: 1 000-m'/s of Standard

Units Width Height Length (Tonnes)



TUBOSIDER Tubosider are the largest manufacturer of corrugated steelpipe products in Europe. There are several advantages of theirfabricated tanks over traditional concrete or crate systems:

• Infinite variety of layouts using pipes from 0.3 to 3.6mtr• Fully pre-fabricated including access shafts, ladders, inlet connections

• And flow regulators to restrict discharge to a specified rate.• Accessible for routine inspection• Designed to Highways Agency Standard BD12, to withstand full highways loadings

• BBA certified and the jointing method has been independently tested and approved by Wrc.

The Tubosider product range.1. Stormwater attenuation tanks2. Flow regulators and duty standby pumps3. Soakaways4. Culverts5. Acoustic barriers6. Separators

TUBOSIDER FLOW REGULATORSTubosider Flow Regulators can be installed in new or existingmanholes, they can also be installed directly into Tubosiderstormwater management tanks.

Each Flow Regulator is designed and fabricated to meet thespecific site requirements, all are manufactured from highgrade stainless steel AIS1316 for maxium durability.

BELOW GROUND DRAINAGE & CIVILS SYSTEMSWATER MANAGEMENT SYSTEMS

AquaCell®• For stormwater storage or soakaway applications• Each unit is modular (1.0m x 0.5m x 0.4m) with 190 litre capacity, 95% void and weighs 9Kg

• Can be clipped together in single layers and pegged together in multiple layers• Fully BBA approved and can meet with the• Technical Requirements of the NHBC• Significantly reduced risk of flooding

Garastor®• A polypropylene flow 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

• Two versions of Garastor are available, the 6SC500 (500mm dia x 1m deep) for garageinstallations, and the 6SC501 (500mm dia x 1.25m deep) for use with AquaCell

• Can be used as a flow control device for any AquaCell storage tank, no greater than one unit deep with a discharge of up to 1.4 l/s via the 30mm release flow orifice

• Maintenance free, with no moving parts or filters• Safer than open/above ground structures• Garastor® is manufactured under licence (PATENT NO GB2357093)

Silt Trap• Polypropylene chamber to collect silt and debris (500mm dia x 1.25m deep)• Prevents silt from entering storage/ soakaway tank, clogging inlet pipework• Ensures full capacity of storage/soakaway tank is not reduced due to siltation build-up

• Ideal for use in conjunction with the• AquaCell Stormwater Management System• Lightweight and easy to install• Easily extended (if required) using the 500mm Extension Kit (6SC205)



Below Ground Drainage and Civils Systems

AquaCell Unit (for trafficked sites)

Size Part PackNumber Qty

160 6LB100 12

For soakaway and storageapplications - 1.0m x 0.5mx 0.4m modular unit - 95%void. Supplied completewith three clips and twoshear connectors.

Silt Traps


- 6LB600 1

500mm dia x 1.25m depth


150 6UR141 1

S/S Adaptor - 6UR socket x160mm BS EN 1401 spigotfor connection of OsmaUltraRib to infiltration unit.


150 6UR099 1

S/S Level Invert Reducer - to110mm OsmaDrain pipe.


150 6TW141 1

S/S Adaptor - 6TW socket x160mm BS EN 1401 spigot


160 6D099 a 1

S/S Level Invert Reducer - to110mm OsmaDrain


150 4D916 1

PE Adaptor - 160mm spigotconnection to OsmaDrain


150 6LB104 1

Flange Adaptor (150mm) -6UR socket for connection ofOsma UltraRib to infiltrationunit at positions other than preformed opening.


225 6LB106 1

Flange Adaptor (225mm) -9UR socket for connection ofOsma UltraRib to infiltrationunit


- 6LB105 1

AquaCell Clip (spare) - forjoining Infiltration Units


- 6LB102 1

AquaCell Shear Connector(spare) - for joining InfiltrationUnits in multi layer installations

NEW AquaCell Lite Unit (forlandscaped/non-trafficked sites)


160 6LB050 12

For soakaway and storageapplications - 1.0m x 0.5m x0.4m modular unit - 95%void. Supplied complete withthree clips and two shearconnectors. NEW

STORMWATER MANAGEMENT SYSTEM -AQUACELL SYSTEM

Ancillary Items



• •

ELLIPTICAL PIPESElliptical pipes are used for foul and surface water drainage applications, stream diversions, culverting and attenuation storage tanks. The pipe’s elliptical internal profileis hydraulically efficient and the external polygonal profile is structurally efficient.Together they provide a unique and highly cost-effective reinforced concrete drainageproduct. This system offers significant advantages over others, particularly box culverts, by providing superior hydraulic performance and a fully watertight elastomericcaptive gasket joint.

SPECIFIER BENEFITS• Where pipes are laid in either the vertical or horizontal plane, the elliptical profile permits self cleansing velocities at low flow rates. Consequently the risk of siltation is reduced compared to the equivalent box culvert.

• Improved flow rates mean pipes can be laid at shallower gradients thereby reducing trench excavation costs.

• In situ secondary inverting is not required for dry weather flows.

• Where ground levels and invert levels only permit minimal cover, pipes can be laid in the horizontal plane and still provide an excellent hydraulic capacity.

• Compaction is required only to prevent surface settlement, therefore special backfill materials are rarely required.

• Pipes can be designed to withstand full HA & HB45 wheel loadings.

• Where loadings permit, minimum cover depths of 200mm may be accommodated.

CONTRACTOR BENEFITS• Pipes have a high performance elastomeric captive gasket for quick easy jointing and a fully watertight joint.

• Pipes are 2.4m long, therefore fewer joints are required than with box culverts.

• Installation costs are further reduced since joints do not require priming or sealing with a separate sealing compound.

• An in-wall joint and flat polygonal sides enable pipes to be laid on a flat bed without socket holes.

• Optional cast in lifting anchors enable safe and rapid handling.

Elliptical Pipes Data

All dimensions and weights are approximate, customers should ensure that liftingequipment has sufficient capacity to allow for variations.

Internal External End Face Lengths Effective ApproxDimensions Dimensions Length Product‘L x H’ ‘A x B’ ‘C’ ‘D’ Weightmm mm mm mm m kg1000 x 650 1250 x 900 520 370 2.40 26001150 x 750 1400 x 1000 600 430 2.40 30001650 x 1000 1930 x 1280 850 500 2.40 46001950 x 1150 2270 x 1470 1020 570 2.40 63002350 x 1350 2710 x 1710 1230 670 2.40 86002650 x 1500 3050 x 1900 1450 740 2.40 10800



ELLIPTICAL PIPES

FITTINGSA range of elliptical fittings can be manufactured to order including junctions, precastmanhole access shafts, end walls and chambers.

QUALITY & SPECIFICATIONElliptical pipes are manufactured using modern computerised concrete batching equipment to achieve consistently high quality products with sharply defined joint profiles. Elliptical pipes are supplied under a Quality System complying withBS EN ISO 9001:2000 and the relevant parts of BS EN 1916 and BS 5911-1 Precastconcrete pipes, fittings and ancillary products.

SCHEME DESIGNEH Smith offer advice at all stages of scheme design and installation. When specifying and installing elliptical pipes please refer to the current version of ProductData Sheets:

• PD 25 – Hydraulic design charts for elliptical pipes.• PD 26 – Structural design table for elliptical pipes.• PD 28 – Specification for the manufacture of elliptical pipes.• PD 29 – Installation of elliptical pipes.

Manhole Access

Attenuation Tank

Narrow Trench Minimal Cover



CHARCON GRASSGRIDCharcon Grassgrid is a highstrength, interlocking cavity gridsystem, which can be used to create natural looking hardstanding for vehicles and linings for swales. Suitable for alloff-road areas including roadside verges, overspill car parksand recreational areas, Charcon Grassgrid can also be usedfor airfield taxiways and helipads and for the strengthening of embankments and watercourses.

CHARCON INFILTA BLOCK PAVINGCharcon Infilta is a rectangular block paving system, incorporating a 5 mm spacer design. Each interlocking unitwith its specially designed nib structure, provides a 5 mmvoid, allowing ingress of water through to the storage system.

Available in red, brindle, charcoal and natural grey, Charcon’sInfilta block paving offers all the strength and performanceproperties of Charcon’s established range, with the addedenvironmental benefit of sustainable drainage.

SUSTAINABLE URBAN DRAINAGE SYSTEMS(SUDS)

Key to SUDS illustration1 Bardon PlayAble sports surfacing on Bardon Drainasphalt, with Charcon

Permavoid™/granular system2 Charcon Permavoid™ system3 Charcon Geomembrane4 Bardon Hydrain with granular/Charcon Permavoid™ sub-base5 Charcon Permachannel™6 Charcon Grassgrid lining a swale7 Charcon Infilta with Charcon Permavoid™/granular system8 Charcon Geotextile9 Charcon Permakerb™ draining into Charcon Permavoid™ via an impermeable

asphalt surface10 Charcon Infilta with a granular sub-base11 Charcon Permavoid™ system

SUDS

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