Closed Drainage

Use this function to define the closed drainage. Closed drainage can now be defined in two ways:

1. Closed Drainage can be generated directly from WS models by initiating them to the road model (to initiate - refer to From WS Model below).

   • The road model will read the selected WS model(s) to generate the geometry of the closed ditch.

   • The side slopes of the closed drainage object shall be terminated against the roadbed or the terrain surface depending on the cross-section of the road model.

   • Generated closed drainage affects the quantity calculations in the same way as the parametric method.

2. Parametric Method - The cross-section of the closed drainage is defined manually using the tabs - First, Second, and Third.

   • To take advantage of the options for enclosed drainage, functions have been made available that calculate the ditch profile, based on information about break points in the ditch. The shape of the surface water ditch is still controlled within the surface description.

   • The placement of the ditches in the cross-section will be optional and will be determined by the distance between the break points and the centerline. It is therefore possible to insert all drainage ditches on the same side of the centerline.

Run the function from the following location of the floating window Road Model:

MOUS_ICO Toolbar: Not available from Toolbar

MOUS_ICO Menu: Data > Closed Drainage

The dialog Closed Drainage will pop up.

From WS Model

Automatically generates the geometry of the closed drainage by selecting the WS model(s).

• Use the button Add to select the WS model.

• Use the button Remove to remove the model from the list.

Parametric Method

Manually define the cross-sections of the closed drainage using the tabs First, Second, and Third.

• In the same profile, three separate ditches can be defined.

• Insert - Use this button to insert a row in the right pane of the dialog.

  • Select a row, above which a new row is to be inserted and click the button.

• Delete - Deletes the selected row from the right pane of the dialog.

• Use the shortcut menu of the table for editing.

• Values in the cell can also be copied using the plus symbol (activated when the cursor is at the corner of a cell) and dragging.

Chainage

Start and end chainages must be defined to determine the length of the ditch (minimum of two rows in the left table).

• Sections - The first row will be the start chainage of the profile and the last row in the table will be the end chainage of the profile.

  • Between the first and the last rows, define the sections at which the shape of the ditch cross-section changes.

  • In other words, where there is a change in one of the ditch walls defines the stationing/chainage between the start and end chainage.

  • These break points can be inserted in selected profiles.

  • The profiles will be sorted in order of ascending profile numbers.

  • Linear interpolation will be performed between two profiles.

Type

In the cross-section, the break points in the drainage ditch are described using the distance from the centerline.

• Elevation may be defined as relative (REL) to the centerline or it can be absolute (ABS).

  • By clicking in the cells of the column Type, you can switch between relative and absolute.

• In this way, a polygon will be defined which will be excavated or blasted out to allow room for cables and pipes.

Last

The extent of the longitudinal direction is defined using a start and end chainage. In association with the finish profile, define a code to indicate that the sub-section will end here.

• Only the ditch, which has the same shape along the entire section, needs to be described in the first and last profiles.

• The end profile is indicated with the character X.

• This field is only used in the end profile to give notice to the software that the sub-section will end here.

• For other profiles (break points) the field should be blank.

• For example, if X is defined in profile 4850 and the next profile is 5000, no ditch will be inserted in sections 4850 - 5000.

Points in the ditch cross-section

Break points in the ditch cross-section are defined by the distance from the centerline and the elevation (absolute or relative to the centerline).

• Offset - Distance (meter) from the centerline using signs (+/-) is defined in the cells of this column.

  • A negative prefix will indicate that the ditch is located on the left side of the centerline.

  • The height of the points is given in accordance with the indicated codes for the type of height data, either absolute heights (contour heights) or relative heights in relation to the reference surface.

  • If relative heights and the same parameters are used throughout the section, the ditch bottom will be given the same vertical curvature as the centerline.

  • Where there is no gradient, or only very little, in the vertical curvature, it might be worth using absolute heights (contour heights).

• The points will not be numbered, but will be defined in series either outward from the centerline or inwards towards the centerline.

• Take care to define them in their natural series.

When defining ditches, Novapoint Road Design will find the cutting point between the ditch walls and either the roadbed or the road top surface.

The lowest cutting point of these will be selected.

If the ditch is placed outside the road area, the ditch will be terminated where the ditch wall cuts the terrain's top surface. If the ditch is described in such a way that the first or last ditch wall will theoretically not provide a cutting point, the wall(s) will be extended to the cutting.

Apply

Use this button to execute the function.

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