Gravity To Siphonic Roof Comparison
Gravity drainage works – however it is extremely inefficient
- Horizontal pipes need pitch slope. The water flow-rate is dictated by the gradient available(this gradient also restricts the distance a pipe can travel as you use up available ceiling space).
- This leads to Multiple rainwater pipes in locations largely dictated by the sloping horizontal pipes rather than design team choice.
- Gravity drains/pipes require ⅔ air to transport ⅓ water = big diameters.
- Vortex formation at the gravity roof drain results in the water being transported in an inefficient spiral motion rather than straight into the pipe below.
- Limited or No testing data to produce flow ponding graphs for Gravity Drains = unidentified ponding on roof
“With Gravity, Life’s a Pitch!”
HydroMax® Siphonic Roof Drainage – simple and effective
HydroMax® = Design Flexibility – Find Solutions not possible using Gravity
- Smaller Diameter pipe work – approximately half the gravity diameter following same routing
- Less downpipes = Reduction in Below Grade Drainage
- Rainwater downpipes routed to the design team/client’s chosen locations freeing up valuable building space.
- Routing of rainwater pipes to the outside walls – Eliminates Below Grade Drainage Under the Building Floor.
- Pipes run full-bore with self-cleaning properties.
- Easy coordination of services due to pipework running flat.
- Less pipes = Reduced construction time and cost.
- Ability to route rainwater pipes to pond retention or Rainwater Harvesting. And LEED benefits.
- Less Ponding on the roof due to suction effect
- BIM modeling compatibility
Gravity v HydroMax® in Warehousing and Manufacturing
- Eliminate Vertical Downpipes
- Eliminate Internal Downpipes
- Eliminate Drainage Under Building Floor
- Less pipework
- Smaller diameters (pipes, fittings, couplings, insulation, hangers)
- Less labor
- Quicker to install and obtain a watertight building
SAVING 32% of Pipework and Labor with Smaller Diameters
Virtually eliminating below grade drainage with its extensive trenching.
Traditional Gravity Solution
530 metres Pipework
Diameters 160mm to 450mm
11 Manholes
HydroMax® Siphonic Scheme
Only 360 metres Pipework
Diameters 56mm to 200mm
1 Manhole
Gravity v HydroMax® in High Rise – Eliminate Vertical Downpipes
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