Another day, another new poster. Let me know what you think of Josh’s first post on Civil3d. com.

Hydraflow Hydrographs and Hydraflow Storm Sewers are two pieces of hydrology software originally produced by Intelisolve who was acquired by Autodesk to package within Civil 3D. Hydraflow is a dynamic hydrology tool that allows you to complete a watershed analysis for sites large and small. It also allows you to quickly use the common design methods that you require. Take a look at some of the functions in Hydrographs after the jump.

To show how versatile Hydraflow is, below is a watershed model that I created for a project I was working on recently utilizing the SCS Method.

For this entry I am going to talk about how to initially setup Hydraflow for your region of the country, and prepare your model for further design calculations. There are two parts of Hydraflow that change from region to region, the Intensity Duration Frequency (IDF) Curve and your regional Precipitation Data.

These two items are typically found in your city or statewide standards, and its just a simple data input. For example Iowa utilizes SUDAS (Iowa Statewide Urban Designs and Specifications) who has gathered all the data for the state and split it into nine different regions. After inputting those values, you can then save that data out as an .IDF file and .PCP file for easy importing in the future.

After completing these steps you should have a prepped model ready for your region of the country and you are ready to move on to modeling your data.