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Stormwater & Drainage · 16 calculators

Drainage that passes sign-off.

Rational-method flows, detention storage and pipe / channel capacity ready for the approver. Built for civil and site engineers.

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Tenselo — Open Channel Capacity (Manning)
Inputs
Trapezoidal
0.45m
0.004m/m
0.013
Check capacity
Demonstration only — a simplified set of inputs is shown here. The live calculator includes additional fields and options.
Result
✓Trapezoidal channel
Manning's equation · concrete-lined
1,132 L/s
Discharge
1.97 m/s
Velocity
0.574 m²
Flow area
0.258 m
Hydraulic radius
1.95 m
Top width
97.8 ML/d
Capacity
Real output from the Tenselo Open Channel Capacity (Manning). Confirm the exact selection against the manufacturer's data.

Inside this pack — 16 calculators

Every tool this discipline reaches for, in one place:

Culvert CapacityRiprap D50 SizingKerb Gutter FlowOpen Channel CalculatorRainfall Ifd IntensityRainfall Runoff VolumeRational Method Peak FlowTime Of ConcentrationBioretention Wsud SizingDetention Basin OutletFirst Flush VolumeFrench Drain CalculatorDetention Storage OsdSoakwell InfiltrationArea Drain Spacing CalculatorStormwater Pump Pit

Why it earns its place

Less spreadsheet wrangling, fewer call-backs, sign-off you can defend.

Flows by the method

Rational-method peak flows that planners and councils accept.

Capacity proven

Manning's pipe and channel capacity with velocity in the non-scour band.

Detention that fits

Storage volumes sized to hold the storm and release at the permitted rate.

Every result, on your letterhead

One click turns any calculation into a clean, fully customisable PDF report — branded with your company logo, ready to drop into a submission, quote or design pack.

  • Your logo, company name and project details on every page
  • Inputs, results and the method, all documented
  • Professional output you can hand to a client or approver
Open Channel Capacity (Manning) — Calculation Report
Stormwater & Drainage · Tenselo
SectionTrapezoidal · n 0.013
Discharge1,132 L/s (97.8 ML/d)
Velocity1.97 m/s
Flow area0.574 m²
Prepared with TenseloPage 1 of 1

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