The Trench Volume Report display the volumes required to excavate the pipe and lateral structures. The report includes the total excavation, native backfill, bedding, cover and select materials.
Video Links: Underground Reports
The Trench Volume Report window displays when
click the TV button on the report window. A description of the report
is listed below.
Structure |
Name of the Underground structure. |
Surface/Strata |
Name of the surface used to calculate the trench volumes. |
Color |
Color of the structure. |
Type |
Type of Underground structure (Pipe or Lateral) |
Phase |
Phase of the Underground structure. |
Class |
Class of the Underground structure. Default classes are Storm, Sewer and Water. Underground classes may be added. |
Measure |
Total length of the pipe or lateral. |
Excavate |
Total excavation of the trench based on the reference surface. |
Native Backfill |
Volume of the original excavation used as backfill. This volume excludes all bedding, cover, select and volume of the pipe. |
Backfill Compaction |
Compaction factor added to the Native Backfill. |
Backfill |
Total backfill volume including compaction. |
Bedding |
Volume of bedding material underneath the pipe or lateral. |
Cover |
Volume of the cover material around the pipe or lateral |
Select |
Volume of the select material above the pipe. If Fill to Grade is used (SS 6" Pipe), there will be no Native Backfill. |
Export/Import |
Total volume of export or import required to complete the trench excavation. |
The trench volumes are based on the Trench Description defined for each Pipe or Lateral.
We will examine the trench volumes for the SD 8" Pipe based on the parameters above.
Structure |
SD 8" |
Measure |
= 697.38 ft |
Excavate |
= 611.1 cy |
Native Backfill |
= 611.1 - (38.74 + 49.01 + 77.49 + 12.98) = 432.88 cy (Total Excavation - (Bedding + Cover + Select + Pipe Displacement) See below |
Backfill Compaction |
= 1.15 |
Backfill |
= 432.88 * 1.15 = 497.81 cy (Native Backfill * Backfill Compaction) |
Bedding |
= 697.38 *.5 * 3 / 27 = 38.74 cy (Measure * Bedding Thickness * Trench Width / 27) |
Cover |
= 697.38 * .8 * 3 /27 - 12.98 = 49.01 cy (Measure * Cover Thickness * Trench Width / 27 - Pipe Displacement) See below |
Select |
= 697.38 * 1 * 3 / 27 = 77.49 cy (Measure * Select Thickness * Trench Width / 27) |
Export/Import |
= 611.1 - 497.81 = 113.29 cy (Total Excavation - Backfill) |
