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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Roof Drainage Calculations – Notes
Sign up for our monthly news letter. Note the previous standard gave rainfall intensity figures in mm per hour per square meter for 2 minute storm event. For eaves gutters only the results for straight outlets are shown.
The calculated capacity is based on the gutter being: Compare 12056- actual area drained with the allowable area drained. Accept and continue Learn more about the cookies we use and how to change your settings. For valley and parapet gutter both results for straight and tapered outlets are given. The diagrams below shown the size and types of outlets shown in the tables, if other sizes 1205-63 types are to be used then separate calculations will be required.
Pitched roofs The catchment area has to be multiplied by the pitch factor to obtain the allowable area drained. 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.
Nominally Level Freely discharging maximum flow capacity. Roof drainage layout and calculation.
The faster, easier way to work with standards. Search all products by. Customers who bought this product also bought BS EN You may experience issues viewing this site in Internet Explorer 9, 10 or For square outlets separate calculations will be required.
The gutter shapes and sizes shown below have been used in the preparation of the tables. Click to learn more. If there is a town or towns that you would like to be included please let us know. The catchment area given in the tables is based on the least of: For other design rainfall intensities separate calculations will be required.
Worldwide Standards We can ba any standard from anywhere in the world. 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. Find Similar Items This product falls into the following categories. If the allowable area is greater than the actual area then the gutter system is satisfactory. You may find similar items within these categories by selecting from the choices below:.
The effect of introducing gratings or guards is to reduce the catchment area by up to half.
Schwerkraftenwaesserungsanlagen innerhalb von Gebaeuden. Calculate the actual area drained from the equations given below.
Systeme d’evacuation des eaux pluviales, conception et calculs. Flat Roofs The catchment area can be taken as the allowable area drained.
To use the tables: Dachentwaesserung, Planung und Bemessung. Roof drainage, 1205-3 and calculation Status: If there is a town or towns that you would like to be included please let us know Gutter Types The gutter shapes and sizes shown below have been used in the preparation of the tables.
BS EN 12056-3:2000
Return period of 1. Use of Tables To use the tables: For the UK, the maps in the standard show the intensity for various return periods from 1 year to years. Determine the depth of gutter required, based on the distance between outlets Calculate the allowable area drained by multiplying the catchment area by the pitch factor.
For flat roofs the design head of water has been taken as 35mm. Parapet or Eaves Gutter Pitch. Please download Chrome or Firefox or view our browser tips. Take the smart route to manage medical device compliance. Check bx our web directory of the UK roofing and cladding industry www.
We use cookies to make our website easier to use and to better understand your needs. Reseaux d’evacuation gravitaire a l’interieur des batiments.
The catchment area is given for outlets with and without gravel guards.