Concrete Channel Material Volume calculator.
Subtract a measured trapezoidal open void from a rectangular concrete channel section. Geometry only; drainage capacity and channel design are not calculated.
Your inputs
Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.
A clear estimate starts here.
Enter your dimensions and product details to see the quantity and purchase breakdown.
Formula and assumptions
How this calculation works.
Subtract a measured trapezoidal open void from a rectangular concrete channel section. Geometry only; drainage capacity and channel design are not calculated. V = Σ[length × (outer width × outer height − void depth × (void top width + void bottom width)/2) × count] × allowance.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Your material allowance
- 0 %
- Segment length
- 10 m
- Outer width
- 0.6 m
- Outer height
- 0.4 m
- Inside void top width
- 0.4 m
- Inside void bottom width
- 0.2 m
- Inside void depth
- 0.3 m
- Identical components
- 1
Concrete channel order volume: 1.5 m³
Uniform rectangular outer section with a contained trapezoidal void. Shared intersections must be excluded from segment lengths. No flow capacity is calculated.
Before you purchase
Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.
Counts quantities from an existing supplied specification. Does not design construction, certify safety, recommend application requirements or establish code compliance.
Example dimensions and product properties are illustrative arithmetic inputs only. Obtain actual yield, density and coverage from your selected supplier.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-08. Calculation and review policy.