Features and Capabilities Windows 98 and higher format featuring Windows Input. Output to Screen and/or to Printer in Tabulated Format. Data file capability for quick and easy work sessions. Easy input format. US Customary or SI Units. Calculates flow rates for control structures for increasing stage/headwater and tailwater conditions. Supports weir structure, riser structure, culvert structure with circular, box, oval and arch shapes. Plots Rating Curves and Natural Channel Cross Section(s). User Friendly - Just point and click - drop down menus and convenient toolbar. Other Features Include: Conversion between units at the click of a button! Versatile Printout Capability to any size paper - Portrait or Landscape Orientation. Versatile range of printers supported. And More!