Details on “Drainage” in the “Settings” (Wastewater/Roof Drainage)
Information about the tab Drainage in the Settings dialog in the Pipe Network Calculation Waste Water and Roof Drainage.
In this tab you can determine global settings for calculation. Select the calculation method and the building type, specify minimum slope and determine global settings for technical data of toilets. The settings are saved with the project.
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Method
| Element | Meaning |
|---|---|
| Calculation Method | Select the desired calculation method from the top drop-down list. |
| Building | Specify the building type in this drop-down list. This automatically sets the discharge index. For the building type Special Building, you can adjust the discharge index. |
| Discharge index | The discharge index depends on the selected building type. For the building type Special Building, you can adjust the discharge index. If you want to use different discharge indices for individual pipe sections of a pipe network, you can set this in the Pipe Section Data dialog, which you can open in the calculation dialog using the two Edit buttons. |
| Apply recommendations of SN 592 000:2012 | This option is available in the SN 592 000:2012 calculation method. If you select the above method, the option will be activated automatically. Enabled: The national recommendations of the Swiss standard for the dimensioning of the pipe system are taken into account in the calculation. Disabled: Instead of the recommendations of the Swiss standard, the boundary conditions of EN 12056 are taken into account in the dimensioning of the pipe system. |
| Use planning specifications of the pipe system manufacturer | Enabled: If you use pipe systems from a specific pipe system manufacturer, the associated planning specifications of the pipe system manufacturer, e.g. maximum flow rates for individual nominal pipe diameters, are taken into account in the calculation and dimensioning. |
| All branches have an inside radius | Enabled: Calculation is based on the assumption that all branches have an inside radius. This can affect the dimensioning of down pipes. This property can also be set in the technical data of individual branches with the command Technical data ... in section Components. |
| Ground pipes behind lifting stations with increased filling level | Enabled: Ground- and collecting pipes behind lifting stations are dimensioned using a higher flow rate. This makes for smaller dimensions. It can be combined with the option Ground pipes behind open pit with increased filling level. Sewage water: Filling degree for ground pipes inside the building, behind lifting stations. 0.7 Sewage water: Filling degree for ground pipes outside the building behind lifting stations and open pits: 1 |
| Ground pipes behind open pit with increased filling level | Enabled: Ground- and collecting pipes behind open pits are dimensioned using a higher flow rate. This makes for smaller dimensions. It can be combined with the option Ground pipes behind lifting stations with increased filling level. Mixed water: Filling degree for ground pipes starting at DN 150 inside the building behind, behind open pits: 1 Rainwater: Filling degree for inside or outside ground pipes behind open pits: 1 |
| Ignore drawn slopes. | Enabled: Waste water pipes are calculated using the minimum slope. Disabled: Waste water pipes are calculated using the drawn slope. |
| When drawn slope is too small, insert a minimum slope | Enabled: If the slope of drawn waste water pipes turns out to be smaller than the minimum slope, the minimum slope is used for calculation. |
| Allow a minimum slope from 1:DN for exterior ground pipes | Enabled: The minimum slope of exterior ground pipes is made independent from their dimension. Note: For large dimensions, the minimum slope of ground pipes may be undercut. |
Minimum slope
A minimum slope can be specified for different pipe types.
| Pipe type | Standard value for minimum slope |
|---|---|
| Ground pipe | 0.5 cm/m |
| Collecting pipes | 0.5 cm/m |
| RW connection pipes | 0.5 cm/m |
| Rainwater down pipe offset | 17.6327 cm/m (=10°) A down pipe with less than 10° slope will be dimensioned according to rules for collecting pipes. A down pipe with equal or more than 10° slope will be dimensioned according to rules for down pipes. |
| Filling degree RW down pipes | 0.33 |
| Slope limits | This option is available when selecting the wastewater treatment method SN 592 000:2012 and is activated accordingly. The fields for manual entry of the minimum slopes are then deactivated. Clicking on the button opens the Minimum Slope according to SIA SN 592 000:2012 dialog, which lists the specifications for slope limits from the underlying standard. |
Length of down pipe
Defines the length from which pipes are recognized as down pipes.
Depending on the project, it may be useful to reduce the length of down pipe so that down pipes with a length of less than 1.8 m are also recognized as down pipes and not as collecting pipes pipes. This guarantees that associated ventilating pipes are correctly detected and adjusted.
If a down pipe is detected as a collecting duct and a secondary ventilation is connected above the down pipe, it is possible that the dimension of the secondary ventilation is applied to the actual main ventilation, since without a down pipe the main ventilation is not detected correctly.
Toilet presettings
Depending on the selected calculation method, various example specifications are available for the flushing quantity, the default dimension (Preset DN) and the connected load (Preset DU). All toilets that are newly inserted into the drawing will receive the selected toilet presets. The values are set and saved in the component dialogs (Technical data) of the individual consumers. You can also set the values using the LINEAR Properties, allowing you to assign values to multiple components at once. The flushing quantities, dimensions and connection values of the individual toilets can deviate from the default value and can be set individually for each component.
If already placed toilets are to receive new settings, the pipe network needs to be recalculated beforehand. Change the toilet presettings following the recalculation. In a dialog that appears, you can then decide whether to update all the toilets of the pipe network or to use the settings as the default for newly added toilets.
| Element | Description |
|---|---|
| Setting for new WC | Drop-down list for selecting the toilet preset. For each calculation method, different specifications are available for flush volume, default dimension and default connection value. |
| Default Flush Volume, Default DN, Default DU | The value from the drop-down list is shown. You can change the value manually. Note: The preset values are read from external files. If you manually enter a value that does not exist in that external file, the first entry from the external file will be used. This value deviates from the manually entered one. |
| Assign values method-independently | Enabled: The entered values are used as preset values for flushing quantity, dimension and connection value. The external files from which these values are taken will not be checked. |