KTDID is KYTC’s hydraulic design software for culverts, ditches, inlets and etc., there are 6 main components in the KTDID software, and I upgraded 3 of them before I leave. This is a WinForms program. It will help user download the precipitation data of some area of Kentcuky. Then it can plot out the trend figure of precipitation and also estimate 2 important parameters for the researchers need to predict. I introduce the Jacob iterative method to the system.