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Online Flow Rate Calculator Launched
1st February 2002
We are pleased to announce an enhancement to our online
electronic catalogue, which enables users to quickly and easily work out the
number of roof outlets required based on design roof area, head of water and
design rainfall rate.
When displaying product details for a roof outlet, there
is now the option to 'View Flow Rates', which will display a window with
information similar to that shown in the example below.
By simply entering your design rainfall rate, design roof
area, the head of water required and clicking on the 'Calculate' button, the
roof outlet calculator will work out the roof area drained per outlet and hence
the number of outlets required (note - the example below is non-functional). To
see it in action, click the link below to go to our electronic catalogue, search
for 'roof outlet' and display an outlet of your choice.
Click here to search our
online electronic catalogue now!
Example Flow Rate Display:
Flow Performance Figures For WB514
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Head of water at outlet:
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15mm
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20mm
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25mm
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30mm
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35mm
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40mm
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50mm
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Flow Rate
(l/s):
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3.98
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5.47
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7.29
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8.75
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9.35
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10.1
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10.75
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Roof area drained (m²) at 150mm/hr
rainfall rate:
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96
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131
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175
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210
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224
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242
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258
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Roof Outlet Calculator
The design of the layout of roof outlets should be in
accordance with the recommendations given in BS 6367. Select the head that
you wish use and type in a value in m² for the effective roof area that you
wish to drain, and based on that information and the rainfall intensity you
input, the roof outlet calculator will work out how many outlets are
required.
Result:
Number of WB514 outlets required
to drain a 1500m² roof area with a 35mm head at 150mm/hr rainfall intensity
= 7
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