HydroCAD is the leading Hydrology & Hydraulics software in the USA - used by most of the top civil engineering firms because of its broad technical capabilities and ease-of-use. HydroCAD takes the TR-20 and TR-55 methodology to the next level, with powerful options for outlet devices, pond storage, rainfall libraries, pumps, vortex valves, underground chambers, CAD import, and much, much, more.   HydroCAD has always been surprisingly affordable, and our unique pricing structure lets you expand your node capacity and user-count as your needs grow. With our extensive Help system, tutorials, webinars, web articles, selfstudy program, and free email support you’ve got all the resources you need to get the job done right and on-time.