To flood the water map, select the 'Operations→Water map→Flood wizard…' menu option. This wil open the water flooding wizard, shown below:
The controls are as follows:
To see a typical water map, go here.
L3DT will automatically flood seas wherever the design map has a 'sea seed' special land type. This may be done either by using the auto flood sea option in the water-flooding wizard, or by using the 'Operations→Water map→Auto flood sea' option in the menu.
Similar to auto-flooding sea, L3DT can automatically flood lakes wherever the design map has a non-zero 'lakes' parameter. This may be done either by using the auto flood lakes option in the water-flooding wizard, or by using the 'Operations→Water map→Auto flood lakes' option in the menu.
If you are unhappy with the lakes you may delete individual lakes using the 'delete water body' mouse mode, or clear the whole lot by selecting the 'File→Close→Water map' menu option.
The subterranean water table is required for assigning the land types in the attributes map (see the algorithms page for details). The water table is calculated via the water table modelling wizard, shown below. This window is opened by enabling the calculate water-table option in the water flooding wizard, or by selecting the 'Operations→Water map→Flood water-table' option from the menu.
This window exposes the base-level modelling parameters of the water map calculation, which are described - poorly - on the algorithms page. The default parameters were entirely arbitrary (the old 'what looks right' factor), so if you want to change the settings please feel free.
Please refer to the water flooding tool page.
Please refer to the delete water body tool page.