Drainage system (galleries) can be defined in gravity dams, spillways, water intakes and free-fall spillways. They can be created by clicking the Galleries command, which activates the window shown in Figure 79.

Figure 79

The window contains a list of drainage galleries. Drainage galleries can be created by clicking the Add a gallery button.  The window in Figure 80 then appears, allowing the user to set a new drainage system or edit an existing system.