Open Channel Flow Calculator is a powerful little engineering utility for quick and accurate calculations. OCF Calculator will solve for any variable in any of the following common open channel flow calculations in English or Metric units:-Circular Channel-Trapezoidal Channel-Rectangular Channel-Irregular Channel-Contracted Weir-Suppressed Sharp Crested Weir-V-Notch Weir-Cioplletti Weir-Sluice GateOCF Calculator is most useful for sanity checks and quick in-meeting calculations. This app also includes a material selector for fast Manning