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HydroMax™ Siphonic Drainage

Leaders in Siphonic Drainage

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

11

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

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Suitable Projects for Siphonic Drainage

Retail Chains

Over 1000 WalMarts with HydroMax™

Royal Ascot Racecourse Ricoh Stadium and Arena, Coventry

Stadium of Light, Sunderland


Stadium

Dundrum Retail Shopping Malls with multi-level Car Parks 313 Orchard Road, Singapore

Shopping Mall


Accident Fund, Lansing USA

E-Tek Flagship Trinidad

Fusionopolis Singapore

Commercial Office Building


Student Accommodation, Wembley

Johnstone County Detention Center, USA

Ibis Hotel, Singapore

Accommodation/Hotels/Prisons


Forest Park Medical Center, Dallas Mercy Hospital, Des Moines, IA

Hospital


D’Leedon Residences, Singapore

Athletes Village London 2012 Olympics

Apartment Blocks


Apartment Blocks


The Wharf Residence JEM Jurong Gateway

Podium Decks


Marina Heights, Tempe AZ

with Trench Drain

Green Roofs


Siphonic Drains installed at

waterproofing membrane level

Airport


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


25

General Motors KD Parts Incheon 110,000m² for Tesco

Warehousing & Distribution Centres


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Manufacturing Plants


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Schools, Sports and Community Centres


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Flagship Projects


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


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


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

33

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

http://www.hydromax.com/

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