Hydraulic Structures Pro
The app's icon: a sluice gate holding water back

Weirs, gates and culverts, solved on your iPhone

Hydraulic Structures Pro works out the discharge, head or headwater of the structures that control open channel flow, with the rating curve and a PDF report to go with it. For iPhone and iPad.

Coming soon to the App Store
The sluice gate form, with a section of the gate and its inputs The list of seven hydraulic structures The performance curve of a culvert, with inlet and outlet control

Seven structures

Each solves for the discharge or for the level that passes it, and says so when the answer runs into the limits of its method.

Sharp-crested weir

Rectangular with or without end contractions, V-notch and Cipolletti, by the Rehbock and Francis equations, with Villemonte's reduction for a submerged crest.

Broad-crested weir

Critical flow over the crest on the total head, with the approach velocity found by iteration and a check against the modular limit.

Ogee spillway

Pier and abutment contractions, and a discharge coefficient that follows the head away from the design head.

Orifice

Circular or rectangular, discharging freely or drowned by the tailwater.

Sluice gate

Free flow by energy, submerged flow by Henderson's energy and momentum solution. Solve for the discharge, the opening or the upstream depth, with the thrust on the gate.

Culvert

Headwater in inlet and in outlet control after FHWA HDS-5, for concrete pipes, corrugated metal pipes and box culverts, with the performance curve.

Stilling basin

The hydraulic jump from either depth: sequent depth, length, energy dissipated, and the USBR basin that suits it.

Made for the desk and the site

  • Metric and English units. Switch on any form and what you typed is converted, not lost.
  • Charts. A discharge rating curve or culvert performance curve with every result, with the solved state marked.
  • PDF reports. The inputs, results, notes and chart on paper, to share or file.
  • Saved calculations. Keep a calculation under a name and open it again later.
  • Works offline. Nothing leaves your device: no account, no tracking, no network.

The results are for preliminary design and checking. The coefficients are typical values: confirm them for the structure at hand, and have the design reviewed by a qualified engineer.