This is a full-day hands-on workshop about adjusting the open source code of Delft3D and compiling it to your own preferences. We will start with downloading the Delft3D code and compiling it to obtain the necessary executable. Then, we will try to add an additional function to the code and compile Delft3D with this newly specified function. After we faced these challenges, we will try to run Delft3D in parallel-mode. Off course, as much attention as needed is given to debugging the code adjustments, so they run properly. We have several laptops at our disposal, but you may also bring your own laptop.