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Details on Technical Data for Roof Area

Information about the component data dialog for roof areas.

The roof area provides for the appropriate distribution and balancing of the reference volume flow rates with respect to the roof drains.

Note:

Pipe networks may also be dimensioned without roof areas or gutters. In this case no roof drainage balance or area data will be output. A project may be calculated either with or without roofs or gutters, mixtures are not accepted. In a drawing, you either have to avoid roof areas and gutters consequently or all systems (pipe runs) have to be connected to roofs or gutters. Use the Siphonic drain components dialog to edit flow rates

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AssistantsTrade / Drawing typeCalculationComponentsTechnical data <Component selection

The roof represents the connecting link between the set local rainfall and the volume flow rate of the individual roof drain. During the dimensioning/calculation, all roof drains within the roof area will be firs collected and allocated to equally-sized roof area parts. The starting point of the volume flow balancing is the rainfall rates defined in the Settings.

Name

Specifies the name of the component. You can modify the name.

uniformly distributed

Resets the areas assigned to the drains outlets to equal distribution.

Drain outlets

The table of drains lists single roof drains/emergency roof drains with their parameters, component numbers and the areas assigned to them. The roof area parts of the individual roof drains may each be edited subsequently. By this means, different allocations of the volume flow rate on the roof area are possible. When reallocating the roof area proportions, the info field Covered by drains serves to control that the sum of the individual area parts corresponds to the total roof area. If the sum of the individual area parts does not correspond to the total roof area, you will get a warning notice. Any further calculation on the basis of incomplete individual area parts will result in calculation error. When detecting the pipe network, an incomplete area balance sheet will be interpreted by the program as not dimensioned and will thus be reset to standard, equally-sized individual area part.

Roof and facade area, Roof area, Facade area

The volume flow rates to be drained off follow from the roof area and the facade area. The entire Roof and facade area is displayed and you may edit the division between roof and facade areas.

Discharge coefficient

At first, the discharge coefficient is suggested as most unfavorable value 1.

: Opens the Discharge coefficient dialog, allowing you to specify other surfaces with the associated discharge coefficients. If you defined SP 30.13330.2016 as the Method in the Settings, no other surfaces are available for selection in the dialog and the value may have to be adjusted manually.

max. accept. storage level, Height up to overflow edge

Allows you to edit the maximum acceptable storage height and the height up to the overflow edge.

Covered by drains, Covered by emergency drains

The values of the areas covered by drains/emergency drains are used to check that the sum of the individual areas is equal to the total roof area.

Reference rainfall, Over-5-m.long rainfall

Indicates the amount of rainwater generated for the Reference rainfall and Over-5-m.long rainfall. The values are defined by the rainfall rate set in the Settings.

Search, Show, Emergency overflow

Search: Allows you to select a roof drain in the drawing. The selected roof drain will subsequently be highlighted in the respective row.

Show: Allows you to have a roof drain highlighted in the table shown in the drawing.

Emergency overflow: Opens Emergency overflow: dialog ... where you can specify whether spouts are supposed to be used in the attic for the discharge of over-five-minute-long rainfall rate.