Design

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What’s the point in designing rainwater drainage capabilities unless you make sure the gutter profile and depth can cope with the design rainfall intensity?  What about the “U” value?  What about thermal bridging?   What about structural strength of your gutter to cope with foot traffic and water weight? What about pipe sizes and shapes?  What about pipe connections?

To make sure that all of the above points are included in design then you need to talk to CGL Systems about “RainPulse”, our “Pressure Assisted Rainwater System”   that provides design of all aspects from roof to ground drainage.

CGL Systems will assist in all aspects of Project Design , providing Design Data for incorporation into your Project including a fully detailed NBS Specification, RFI (Rain Fall Intensity) to BS EN 12056-3; 2000, Ground connection details and all supporting documents for your project.

The 3 main product components for your pressure assisted rainwater system are the Gutter, the Outlet and the Downpipe. Below we detail how the CGL RainPulse system will assist in each of these areas.

Gutter

With almost 30 years experience of designing and manufacturing membrane lined gutters for commercial and industrial buildings there is not a lot that CGL doesn't know about gutters

CGL will assist in -

1. Gutter profile – we can design the appropriate gutter profile to suit the project location, design rainfall rate, roof area and surrounding steelwork
2. Gutter structural requirements – from conclusion of the gutter profile we will advise on the appropriate materials and thicknesses required to ensure the gutter is structurally secure
3. Gutter thermal requirements – with different insulations achieving various “U” values CGL can assist with the selection of insulation type and thickness to suit your project requirements.

Outlet

The key benefit of the RainPulse system is the efficiency of the outlets in discharging large amounts of water quickly in comparison to the design restrictions within BS EN 12056-3: 2000. The RainPulse outlet and downpipe type are critical in achieving this greatly increased efficiency. The RainPulse outlet has been tested at the University of Sheffield. CGLRainPulse will evaluate the flow of water through the outlet to record what capacity the outlet can take. The results of this testing have been recorded as part of the system specific software that CGL will use to calculate the outlet and downpipe requirements for your project. The software takes account of the gutter profile, roof size, expected rainwater intensity, downpipe size, downpipe configuration and building height to ensure the outlets operate efficiently when under most pressure - when all the aforementioned is taken into consideration we will provide the design of -

1. Outlet position – we will either provide the most economical rainwater outlet position or we will look to position the outlets to suit your specific requirements which may be near appropriate steelwork for the pipes to be connected
2. Outlet diameter – depending on the volume of water, the height of the building and the location of the outlet, the software will calculate the appropriate diameter of each outlet suitable for the equally sized pipe system creating a competent flow and balanced system.
3. Outlet quantity – we will advise on the amount of outlets required for each run of gutter
4. Litres per second per outlet – Each unit is designed to discharge the correct amount of Rain water to the calculated RFI &  location of the outlet, Each outlet is designed in total isolation from any other outlets within the system for  a risk free rain water environment.

Downpipe

Due to the volume of water that is flowing through the outlets and downpipes it is paramount that the pipe system can accommodate the pressures.  CGL therefore have 2 options for a downpipe system to ensure complete efficiency of the whole system.  We offer an HDPE (high density polyethylene) BBA Approved system and an Aluminium system which can be supplied as plain mill finish or a PPC finish.  Other key design elements include -