How is bedding computed?

Trench width × bedding depth × pipe length — the trench detail gives the dimensions per pipe size.

Schedule or plan for pipe length?

The schedule governs quantities on agency work, but measure the plan too — a disagreement is a review finding either way.

Takeoff Guides

Drainage Pipe Takeoff Guide

Short answer

A drainage pipe takeoff measures pipe in linear feet by size and material — from structure to structure — counts drainage structures as EA, and computes bedding and backfill from the trench section; the drainage schedule reconciles every quantity.

Drainage takeoff reads the plans one way and the schedule another: the plan gives lengths and locations, the schedule gives structure types, inverts, and pipe slopes. The two must agree, and the takeoff is where you prove they do.

On FDOT work, the drainage structures schedule is the governing table — every structure and pipe appears there with the index it is built to.

What to measure

Pipe LF per size and material — schedule to plan agreement.
Structures EA per type — inlets, manholes, junction boxes.
End treatments at every pipe end — mitered end sections, endwalls.
Bedding volume from the trench detail.
Riprap or sod at outfalls and ditch ends.
Temporary bypass/dewatering items if shown.

Drainage takeoff units

Item	Unit	How measured
Pipe	LF	Structure-to-structure, by size and material
Drainage structures — inlets, manholes	EA	Schedule count, by type/index
End treatments — MES, endwalls	EA	Per outfall and cross-drain end
Bedding	CY	Trench width × bedding depth × pipe LF
Backfill / select material	CY	Trench volume minus pipe and bedding
Underdrain / french drain	LF	Per underdrain plan

Measure between structures, verify against the schedule

Pipe length is center-of-structure to center-of-structure minus the structure widths — or simply the schedule length where the schedule is governed. Measure the plan runs and check them against the schedule; disagreement is itself a plan-review finding.

The trench drives the dirt work

Bedding and backfill come from the trench cross-section detail, not the plan — width by pipe size, bedding depth, and whether backfill is select or native. Deep pipes mean deeper trenches and different quantities per linear foot.