3.4.15.1 Batter Breakline
Overview: Batter Breakline operation calculates a new breakline adjacent to the Reference breakline creating a sloped wall (batter) that lines up to a surface. This is used to finalize drain channels or embankments.
Displayed by:
Right Click Breakline > Batter Breakline
Batter Breakline
Horizontal Offset - offset distance from the center breakline or reference breakline. E.g. If base is 15ft wide, offset distance is 7.5ft.
Define the Slope Ratios
- Up 1v:h: - define h (horizontal) in the up slope ratio, ie if slope is 1:20 then insert 20
- Down 1v:h: - define h (horizontal) in the down slope ratio, ie if slope is 1:20 then insert 20
- Slope to Nearest - use if the length of breakline has some areas above and below the surface
- Slope Up Only - use if breakline is below surface e.g drain channels
- Slope Down Only - use if breakline is above surface e.g levees
Shoot Slope To - select the reference surface where the breakline will be shot from
Shot Interval - define interval between breakline points, use 5m or 15ft
Max Distance - define the maximum horizontal distance from the reference breakline the batter will shoot out to
Example:
1. Draw the breakline. Right click Proposed Topography under Project Explorer > Add Breakline. This will serve as the Reference Breakline or Center Breakline. Make sure there is enough slope (minimum of 0.05%) to allow water to drain out.
2. Retriangulate Proposed Topogprahy without Breaklines to produce the reference surface. Right click Proposed Topography under Project Explorer > Retriangulate > Without Breaklines.
3. Right click breakline > Batter Breakline and define required parameters > OK.
4. The batters will be calculated. Delete the points caught between the batters using Polygon Delete.
5. Retriangulate surface with Breaklines. Right click Proposed Topography under Project Explorer > Retriangulate > With Breaklines.
6. Recalculate Cut/Fill Map to reflect manual changes. Right click Proposed Cut/Fill under Project Explorer > Recalculate Cut/Fill > Tick ON Rebalance and Tick OFF Adjust Breaklines > OK.
