Trench Description

The Trench Description window is used to define the trench parameters to calculate the imported materials into the underground trench.

Video Links: Trench Description Window, Underground Takeoff from PDF, Underground Takeoff from Sitework Data , Underground Reports

The Trench Description window displays when adding a new underground Pipe or Lateral structure. The following parameters may be defined.

Bottom Width	Width in inches of the trench.
Bedding Thickness	Thickness in inches of material below the pipe.
Cover Thickness	Thickness in inches of material to cover the pipe
Select Thickness	Thickness in inches of select material above the pipe.
Fill to Grade	Check box if you want the select material to the top of the trench.
Bench Width	Width in feet of a bench.
Flare Point	Vertical distance in feet from the trench bottom to start the Flare Slope.
Flare Slope	Slope in percent or V:H to daylight from Flare Point.
Pipe Wall	Thickness in inches of the pipe wall. This value will default to 10% of the pipe ID.
Outside Diameter	Thickness in inches of the outside diameter of the pipe.
Inside Diameter	Thickness in inches of the inside diameter of the pipe. This value is derived from the pipe name.
Backfill Compaction	Compaction factor for native backfill.
Ppe Length	Used to display the number ofr pipe joints on a run of pipe or lateral.

When the Trench Description window is closed, the Pipe structure will be displayed along with the material section and multipliers to convert the volumes to cubic yards.

Material	Section

Select	The section is the trench bottom width * select thickness. Example above (3 ft * .5 ft =1.5 cf). The Multiplier converts cubic feet to cubic yards.
Cover	The cover is the trench bottom width * cover thickness - pipe displacement. Example above (3 ft * .73333 ft - .5027 cf = 1.6973 cf). The Multiplier converts cubic feet to cubic yards.
Displacement	Displacement is the volume of the pipe. Example above ( π * (.8 / 2)² =.5027). The Multiplier converts cubic feet to cubic yards.
Bedding	The bedding is the trench bottom width * bedding thickness. Example above (3 ft * .5 ft =1.5 cf). The Multiplier converts cubic feet to cubic yards.
Spoil	Spoil is the accumulation of all the import materials. Example above (1.5 + 1.6973 +.5027 + 1.5 = 5.2). The Multiplier converts cubic feet to cubic yards.