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Stormwater management
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Stormwater management for flood mitigation, SuDS compliance and water quality. Geocellular attenuation and infiltration crates. Flow control devices and weirs. Slot drains, channels, gullies and catchpits. Oil separators and silt traps. Headwalls, outfalls and screens. Permeable paving and soakaways. Rainwater harvesting tanks. Telemetry and controls for highways, car parks and developments.
Stormwater management - helping you find the best solution for your project.

SDS SYMBiotIC™ - remote stormwater device management
SDS SYMBiotIC™ enables the remote and autonomous control of any number of stormwater management devices, ensuring they continuously perform at their optimum operational efficiency. SDS SYMBiotIC™ provides real-time access via a web portal to a comprehensive range of operating data. Customer bespoke data extractions and reporting information feeds
SFA (Sewers for Adoption) - precast concrete headwalls
Althon Sewers for Adoption (SFA) precast concrete headwalls are suitable for connecting pipework to open watercourses, and designed for compliance with Sewerage Sector Guidance and Section 104 Agreements. The range supports single or multiple pipe openings, pipe sizes up to 1500mm, and various backwall heights and toe depths, with options for
Angled precast concrete headwalls
Althon's concrete angled headwalls are often specified where the outfall is on a bend and the water needs to flow from the headwall at an appropriate angle to the watercourse. Angled precast headwalls allow pipework entering a watercourse at an angle to be accommodated or for an outfall to be situated on a bend in a river. Althon cast the openings
600 Mitred Headwall - precast concrete drainage inlet for 600mm pipes
Althon 600 Mitred Headwall is a fibre reinforced precast concrete open inlet for surface water runoff, designed for pipework up to 600mm internal diameter. Inlet profile matches a 1:3 (18°) slope for swales and ponds, with a galvanised steel straight bar grating and optional inline non-return valve. Standard finish is natural concrete, with four
SFA27 A headwall, backwall height 1300
SFA27 A precast concrete headwall for connecting pipework discharging into open watercourses. Sewers for Adoption compliant. Pipework up to 675mm for PCC pipework and 750mm for plastic and clayware pipework. Backwall height 1300mm
SDS vortex flow control for stormwater management system
The SDS vortex flow control is used to control the rate at which water is released from a stormwater storage system to downstream drainage systems. It is a self-activating device which controls the rate of water release by inducing a vortex motion. No external energy supplies are needed and it contains no moving parts. Units are equipped with a
AquaCell Plus-R modular stormwater attenuation unit
AquaCell Plus-R is a modular stormwater attenuation unit designed primarily for use in applications where inspectability is required. It is suitable for use in all applications from landscaped areas to heavily trafficked areas
SFA27 B headwall, backwall height 1650
SFA27 B precast concrete headwall for connecting pipework discharging into open watercourses. Sewers for Adoption compliant. Pipework up to 1050mm. Backwall height 1650mm
Stainless Steel 304 Curved Orifice Plates
Curved orifice plates in 304 stainless steel to restrict and regulate the flow of water. The opening in the plate can be manufactured to specified dimensions and positions. All necessary fixing materials and an EPDM seal with every orifice plate: 100mm Stainless Steel 304 Curved Orifice Plate; 110mm Stainless Steel 304 Curved Orifice Plate; 150mm
StormHold™ - precast pipe tank system
StormHold™ precast pipe tank system is a stormwater attenuation system designed for underground installation. It uses precast concrete pipes to form storage tanks that manage stormwater. The system integrates with other FP McCann drainage products, including culverts and soakaways. StormHold™ supports both load-bearing and non-load bearing
400 Mitred Headwall - precast concrete outfall for 400mm drainage pipes
Althon 400 Mitred Headwall is a fibre reinforced precast concrete open inlet for surface water runoff, suitable for pipework up to 375mm and 400mm internal diameter, with a 1:3 (18°) mitred profile matching swale and pond slopes, and supplied with a galvanised steel straight bar grating: fibre reinforced precast concrete headwall for 375mm and
Standard precast concrete headwalls
Althon standard precast concrete headwalls are designed for connecting drainage pipes to open watercourses. The range accommodates pipe sizes up to 2100mm, with options for multiple pipe openings and custom pipe positions. Factory-fitted accessories and compliance with UK water authority guidelines distinguish this product range
Greenfix AquaBoxx™ - versatile modular crate system
Greenfix AquaBoxx is a high strength modular crate system suitable for use in a variety of applications, including: green / Blue Roofs; attenuation Systems; soakaway Systems; pavement Support Systems; for new tree planting. The high strength Polypropylene units have an internal void space of 94% and surface perforations of 63%. The system is
Precast concrete headwalls with penstocks
Althon precast concrete headwalls can be supplied to site with factory-fitted penstocks. As standard, Althon offers penstocks fitted to headwalls to suit pipework from 200 up to 1500mm. When required, Althon can provide bespoke sized penstocks or headwalls
SFA6 Sewers for Adoption precast concrete headwall
The SFA6 is a Sewers for Adoption precast concrete headwall suitable for internal pipe diameters of up to 300mm. It is designed for applications where a smaller than normal footprint is required. The headwall is available in a choice of three backwall heights and three wing wall profiles. Toe depths up to 1000mm are available in 300 or 500mm
AH10 left hand angled headwall
AH10 left-hand angled headwall is a precast reinforced concrete headwall for pipes with ID up to 900mm. They allow pipework entering a watercourse at an angle, or for an outfall to be sited on a river bend. Pipes can be plastic, clayware or PCC. Available with 1.25, 1.65 and 2.13m high backwalls, and 305, 610, 915, 1220 and 1420mm deep toes. Grating sockets. Anchorage brackets. Lifting points
Rain Gardens - planted beds for urban rainwater management and wildlife
Meristem Design Rain Gardens are planted landscape features designed to capture and manage rainfall in urban areas, reducing surface water runoff and supporting biodiversity. Made to fit a range of spaces, they use carefully selected plants to filter pollutants and slow water flow, helping prevent flooding and erosion: planted landscape system for
Bioretention Topsoil - soil mix for swales and rain gardens drainage
MCM's high-performance, general-purpose topsoil provides a little extra cushion, cleaner bottom end and smoother particle shape. Its blend allows for better drainage and the establishment of roots. The topsoil can be laid to 400mm, giving an invaluable boost to borders, turf and amenity landscapes. Standard minimum order is 10 tonnes or 5 multi-lift bags
Stainless Steel 304 Orifice Plates - flat
Flat orifice plates in 304 stainless steel to restrict and regulate the flow of water. The opening in the plate can be manufactured to specified dimensions and positions. All necessary fixing materials and an EPDM seal with every orifice plate: 100mm Stainless Steel 304 Flat Orifice Plate; 150mm Stainless Steel 304 Flat Orifice Plate; 225mm
H20C headwall range, backwall heights 1.25/1.65/2.13m
The H20C culvert headwall is a sectional structure with rebated joint that is assembled on site around the drainage pipe. It is suitable for plastic or clayware pipes up to 1650mm or PCC pipes up to 1500mm. Available with Standard, Horizontal or Chamfered Wingwalls and with 3 standard backwall heights
One piece heavy duty silt trap inlet
Manufactured in GRC and provided with a unique anchorage system. A lightweight recessed headwall suitable for most situations where batter angle is not less than 45 degrees and for use in minor water courses with moderate flows. Althon manufacture 1 & 2 piece heavy duty concrete silt trap inlets with galvanised steel weed screens. Althon
RSFA20 rectangular precast concrete headwall
Althon RSFA20 are Sewers for Adoption compliant rectangular precast concrete headwalls for outfalls discharging into ponds, swales, ditches beaches and rivers. RSFA precast headwalls come with the option of two thicknesses of toe, 300mm and 500mm, each of which is available in three depths. Althon manufactures RSFA20 precast headwalls with three
SFA20 D headwall, backwall height 2350
SFA20 D precast concrete headwall for connecting pipework discharging into open watercourses. Sewers for Adoption compliant. Pipework up to 1500mm. Backwall height 2350mm
Two piece heavy duty silt trap inlet
Althon 2 Piece Heavy duty silt Traps are sturdy structures for use on large diameter pipes and are ideally suited for use in water courses with high velocities of water flow. Althon provide as standard with each unit a galvanized weed screen and removable centre panel for access to the silt for cleaning. Lifting points are cast into the wingwalls

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