Hello
Assuming you are in TS12, you have the route open in Surveyor and you are standing directly over the hole -
Open Topology (F1 or the top tab right-hand side)
Hover over the radio buttons until you find 'Add water'
Position your mouse cursor over the hole and click with the left mouse button. Don't panic if water doesn't show. This may be because the hole isn't deep enough to show water, which is set at the 2m default.
To raise or lower the level of the water it is a simple task to just click-on the 'Adjust water height' button, position the mouse cursor back over the hole, hold down the left mouse button and move the mouse backwards and forwards until the desired height is reached.
You can set the height of the water by typing in the desired figure and then add water by using the 'Add water button'. Moving the mouse in any direction will add more and more water. It only gets a little more complicated if you overlap your water with water set at a different height, but only if you adjust the heights afterwards. This will then set the height of both lots of water to the height of the one you intended to, which is not always ideal. If you do this, DO NOT ONDO. Firstly, before you do anything else, SAVE. This may sound stupid, but it saves all your previous work should the Undo go wrong. After, Save, you can then Undo. Undo may work out OK, in which case you can continue after doing another Save.
You may wish to edit the colour of the water.
Go into Main Menu, Edit Environment.
In Environment you will see a small box, bottom right.
Click on the box and twirl the dials, which if you looked at a clock, would all be set to 7'o'clock. Remember that so that you can put them back if you wish.
I have mine set to a muddy brown colour, like the river is full of sediment after a flood - Red at 12, Green at 11 and Blue at 9
Regards, Dave