Part 3 of BS EN By Brian Whorlow BA Hons, IEng, FCIPHE. Consultant, training course presenter and technical author. Canterbury, UK. Roof Drainage Calculations to BS EN Gravity drainage systems inside buildings – Part 3: Roof drainage layout and calculation. Rainfall Intensity. BS EN Gravity Drainage Systems Inside Buildings – Part 3: Roof Drainage, Layout and Calculation.
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Note the previous standard gave rainfall intensity figures in mm per hour per square meter for 2 minute storm event. Systeme d’evacuation des eaux pluviales, conception et calculs.
Please download Chrome or Firefox 10256-3 view our browser tips. To use the tables: If there is a town or towns that you would like to be included please let us know.
Schwerkraftenwaesserungsanlagen innerhalb von Gebaeuden. Where there are offsets or horizontal runs of pipes, the a separate calculation will be required to determine the capacity of the pipe system from roof level to ground level. For square outlets separate calculations will be required. The diagrams below shown the size and types of outlets shown in the tables, if other sizes or types are to be 12056-33 then separate calculations will be required.
Accept and continue Learn more about the cookies we use and how to change your settings. Where a wall or walls drain on to the roof, for example from a higher building, then more detailed analysis of the catchment area is required.
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Worldwide Standards We can source any standard from anywhere in the world. Click to learn more. For other design rainfall intensities separate calculations will be required.
BS EN 12056-3:2000
As an aid we have chosen a selection of towns throughout the UK, and determined the design rainfall intensity for each town as follows: Search all products by. For valley and parapet gutter both results for straight and tapered outlets are given. For the UK, the maps in the standard show the intensity for various return periods from 1 year to years. For flat roofs the design head of water has been taken as 35mm.
Roof Drainage Calculations – Notes
The roof area shown in the tables is based on outlets with no gratings or guards. The standard also gives four categories of design rainfall intensity. Calculate the bw area drained from the equations given below. Learn more about the cookies we use and how to change your settings.
Pitched roofs The catchment area has to be multiplied by the pitch factor to obtain the allowable area drained. You may find similar items within these categories by selecting from the choices below:. Water supply and waste systems buildingsWaste-water drainage, Drainage, Buildings, Rainwater control systems, Layout, Mathematical calculations, Gutters, Rainwater pipes, Hydraulic tests, Performance testing. You may experience issues viewing this site in Internet Explorer 9, 10 or Although the depth of the gutter has most effect on the catchment area, if the gutter size or shape varies significantly from that shown below then a separate calculation will be required.
Flat Roofs The catchment area can be taken as the allowable area drained. Find Similar Items This product falls into the following categories. Nominally Level Freely discharging maximum flow capacity. Check out our web directory of the UK roofing and cladding industry www. Reseaux d’evacuation gravitaire a l’interieur des batiments. Return period of 4. Return period of 1.
The catchment area is given for ns with and without gravel guards. Use of Tables To use the tables: If the allowable area is greater than the actual area then the gutter system is satisfactory. The calculated capacity is based on the gutter being: This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3. Roof drainage layout and calculation.
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Dachentwaesserung, Planung und Bemessung. The effect of introducing gratings or guards is to reduce the catchment area by up to half.
Catchment Area The catchment area given in the tables is based on the least of: