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What is HydroMax™
Siphonic Roof Drainage?
HydroMax™ is an innovative solution which utilises the power of a natural
siphon to create a high-performance
roof drainage solution.
Why use HydroMax™ Siphonic Roof Drainage?
HydroMax™ is an Engineered Solution which provides many Technical Benefits
HydroMax™ offers cost savings ranging from
25% to 45%!
Top 10 Technical Benefits
using HydroMax® Siphonic Roof Drainage
1. Smaller Diameter pipe work – approx. half the gravity dia.
2. Horizontal pipes are installed without Slope – Flat Level.
3. Pipes run full-bore with self-cleaning properties.
4. A significant Reduction in Below Grade Drainage (common range is from 20% to 60%).
5. Rainwater down pipes routed to the Engineer’s Preferred Locations - This frees up
valuable building space.
6. Routing of rainwater down pipes to the perimeter of buildings Eliminates Below Grade
Drainage Under the Building Floor.
7. Easy co-ordination of services due to pipe work running flat.
8. Fewer pipes = Reduced construction time and cost.
9. Ability to route rainwater pipes to pond retention or Rainwater Harvesting.
10. Reduced Ponding on the roof due to efficient water flow
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Restrictive Factors of Gravity Drainage
1. The water flow-rate is dictated by the gradient available (this gradient also
restricts the distance a pipe can travel).
2. Multiple rainwater pipes in locations largely dictated by the gravity hydraulics
rather than design team choice.
3. Gravity drains require ⅔ air to transport ⅓ water.
4. Vortex formation within vertical gravity pipes results in the water being transported
in an inefficient spiral motion rather than straight through the pipe.
5. The driving force is only the depth of ponding or ‘head’ of water above the roof
drain.
What is wrong with Traditional Gravity Drainage
Systems?
Traditional Gravity drainage systems work but they are inefficient and have a number of
factors restricting performance.
Vertical Gravity pipes run ‘full’ at only 1/3 water
⅓ water in annular flow
⅔ air core
Horizontal (Sloping) Gravity pipes run ‘full’ at only 2/3 water
Extensive Underground Drainage
Drainage under Building Floor
Multiple Downpipes
Typical Traditional Gravity Drainage System
Sloping Underground Drainage makes for difficult
routing to attenuation/harvesting
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Principles of Gravity Drainage
Vortex motion
A large amount of Air is
required to move a small
amount of water.
Extremely Inefficient
Annular Flow
Water adheres to pipe wall
Central Air Core
HydroMax Siphonic Drainage
No Air!
Why is HydroMax™ different from gravity drainage?
Pipes run 100% full bore
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Principles of HydroMax™ Siphonic Drainage
• The Siphonic Roof Drain eliminates air entering the pipe promoting water
filled pipework
• The full bore of the pipe work carries the rainwater
• Water, without air, accelerates down the vertical downpipe, creating
negative pressure and naturally generating a high performance siphonic
flow
• The full height of the building provides the energy for this highly efficient
Rainwater Drainage Solution
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• Eliminate Air
• Pipes run 100% with Water
• Building Height provides energy for High Self-
Cleansing Velocities
• Extremely Efficient
Principles of HydroMax™ Siphonic Drainage
System Comparison
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60m 100m
HydroMax™ Siphonic Scheme
360 metres HDPE Pipework
Diameters 56mm to 200mm
Traditional Gravity Solution
530 metres Pipework
Diameters 160mm to 450mm
SAVING 32% of Pipework and Labour
Smaller Diameters & Less below grade
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HydroMax Installation – Gutters
HydroMax Install. – Flat Roofs HydroMax Install. – Sloping Roofs
Gim Hae Airport
Royal Ascot Racecourse Ricoh Stadium and Arena, Coventry
Stadium of Light, Sunderland
Suitable Projects for Siphonic Drainage
Stadium
Dundrum Retail Shopping Malls with multi-level Car Parks 313 Orchard Road, Singapore
Shopping Mall
Suitable Projects for Siphonic Drainage
Accident Fund, Lansing USA
E-Tek Flagship Trinidad
Fusionopolis Singapore
Commercial Office Building
Suitable Projects for Siphonic Drainage
Student Accommodation, Wembley
Johnstone County Detention Center, USA
Ibis Hotel, Singapore
Accommodation/Hotels/Prisons
Suitable Projects for Siphonic Drainage
Forest Park Medical Center, Dallas Mercy Hospital, Des Moines, IA
Hospital
Suitable Projects for Siphonic Drainage
D’Leedon Residences, Singapore
Athletes Village London 2012 Olympics
Apartment Blocks
Suitable Projects for Siphonic Drainage
Green Roofs
Suitable Projects for Siphonic Drainage
Siphonic Drains installed at
waterproofing membrane level
Airport
Suitable Projects for Siphonic Drainage
Belfast City Airport Newcastle International
Phoenix Sky Harbor T3 Incheon Airport New T2
Osong Railway Station, South Korea KAIA High Speed Railway Terminal, Saudi Arabia
Railway
Suitable Projects for Siphonic Drainage
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General Motors KD Parts Incheon 110,000m² for Tesco
Warehousing & Distribution Centres
Suitable Projects for Siphonic Drainage
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Flagship Projects
Suitable Projects for Siphonic Drainage
Scottish Parliament Masdar City MIST 1B, Abu Dhabi
- World’s 1st Carbon Neutral City
National Science Centre, South Korea
HydroMax Siphonic Products
50mm Balcony Pressurised Roof Drain
This is a special drain for multi floor
balcony drainage.
The drain has a built in Anti-Backflow
device.
Flow Rate
Max. = 1.5 l/s
(Litres per Second)
50mm Terrace Siphonic Roof Drain
Flow Rate
Min. = 1.5 l/s
(Litres per Second)
up to
Max. = 12 l/s
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Our Metric series of drains come in a range of
models for compatibility with all roof types
Flow Rate
Min. = 1.5 l/s
(Litres per Second)
up to
Max. = 25 l/s
Our Metric series of Overflow drains come in a
range of models for compatibility with all roof types
Flow Rate
Min. = 1.5 l/s
(Litres per Second)
up to
Max. = 25 l/s
HydroMax Siphonic Products
75mm Siphonic Roof Drain
75mm Siphonic Overflow Roof Drain
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Our Metric series of drains come in a range of
models for compatibility with all roof types
HydroMax Siphonic Products
Flow Rate
Min. = 10 l/s
(Litres per Second)
up to
Max. = 100 l/s
Range of Accessories for Our Metric Series of Drains
• Leafguards
• Gravel Guards
• Car Park Drains
• Bespoke Accessories
Drains are available as Podium Deck Drains
Using cast iron frame and grates to house the
Siphonic Roof Drain
125mm Siphonic Roof Drain
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• High Performance
• Versatile and Compatible with any Roof
• Compact for installation in gutters/scuppers
• Anti Tamper Fastening of one-piece Inducer
• Proven track record of Low Maintenance
HydroMax Siphonic Drain Benefits
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HydroMax™ HDPE Siphonic System
Can be Pre-Fabricated in Factory Controlled Conditions
with Engineered Rail Fastening System
60,000m² Roof - Only 4 Rainwater Downpipes draining the Main Roof
HydroMax™ Pipework Installed Absolutely Flat
Level at High level
HydroMax™ Collector Pipe at High Level
HydroMax™ Siphonic System
Level, Small Diameter, Pipes Makes for Easy Co-
ordination with structure and services
Siphonic Standards & Codes
• BS EN 12056-3:2000 (includes Siphonic Drain Test)
• ASME A112.6.9:2005 (Siphonic Drain Test)
• SS 525:2006 (Basic Requirements)
• ASPE/ANSI 45:2013 Technical Design Standard (Design, Installation & Product Standard)
• BS 8490:2007 (Design, Installation & Product Test Standard)
HydroMax™ Qualities & Benefits Summary
• Full Compliance with SS 525:2006
• Full Design Compliance with BS 8490:2007 (31 pages)
• Full Design Compliance with American ASPE ASPE/ANSI 45:2013 Design &
Engineering Standard (50 pages)
• Full Compliance with IPC 2012
• 100% Success Rate
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Siphonic Drainage Analytical Design Program
HydroMax™ provides the following:
• Web based HydroTechnic™ program for easy Technical Support
• Fast Accurate Calculations in full compliance with BS 8490 & ASPE 45
• Advanced Edit Functions to accommodate on-site changes
• Program Generation of Pre-Fabrication Drawings (Eliminates risk of human interface errors)
• Exports data in electronic format for O & M files
HydroTechnic
Analytical Design Program
OVER 10,000 Siphonic Roof Drain Systems
SUCCESSFULLY designed by HydroTechnic
100% SUCCESS RATE
ZERO System Design Failures
PROVEN TESTED - TRIED -
• Identify Interface with civils drainage
• Choose your pipe routing
• Draw schematic isometric drawing to input to the design program (normally in AutoCAD)
• Calculate Pipe diameters for compliance with BS 8490 (or ASPE/ANSI 45)
Unlike normal (gravity) systems – piping cannot be altered without referring back to the Designer for approval
HydroTechnic™ Analytical Design Program
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Key Advantages with HydroMax™ • Drains independently tested to:
– BS 8490:2007
– ASME 112.6.9:2005
• Designs to BS 8490 or ASPE 45
• Independently tested HydroTechnic™ design software (confirmed to have
“unsurpassed accuracy”)
• Range of High Performance Roof Drains (Outlets)
• HDPE Pipes to EN 1519
Key Advantages for Building Owners
• High Performance, Self-Cleansing Roof Drainage System
• Fewer Rainwater Downpipes routed to convenient positions providing an increased and
flexible use of floor space
• Proven Record of Low Maintenance
• Elimination of underground drainage, manholes, etc. within the building footprint
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Key Advantages for the Design Team
• Smaller diameter horizontal pipework installed level
• An Engineered Solution allowing choice of discharge locations
• Flexible Pipe routing with easy co-ordination of services
• Rainwater Management - HydroMax™ can route pipework to attenuation/rainwater
harvesting.
Key Advantages for the Main Contractor
• Improved Construction Build Program
• Significant Cost Savings
• A dry building envelope is attained at an early stage of construction allowing fit-out
works to proceed earlier
• Less Trench work for below ground drainage saving excavation, soil treatment, pipe
laying, back fill compaction, etc.
HydroMax™ Siphonic Drainage
www.hydromax.com
Written by Bill Ross and Dr Malcolm Wearing BEng PhD CEng MICE MCIWEM